MEDICAL RESEARCH COUNCIL
MRC CFS/ME RESEARCH ADVISORY GROUP
CFS/ME RESEARCH STRATEGY
DRAFT DOCUMENT FOR PUBLIC CONSULTATION
17 December 2002
Table of Contents
SUMMARY 3
INTRODUCTION 5
BACKGROUND 6
Method of Working 7
Terminology 7
TAKING FORWARD RESEARCH INTO CFS/ME 8
Research and Refinement of Case Definition 11
Developing the Epidemiological Framework 12
Descriptive Epidemiology
Aetiology
Outcome Studies
Developing Hypotheses about Pathophysiology 14
Infections
Neurology
Muscle Fatigue and Weakness
Immunology
Neuroendocrinology
Central Nervous System Function
Cognitive Performance
Psychological factors
INTERVENTIONS 22
Clinical trials of interventions for CFS/ME
Musculoskeletally-Based Interventions
Psychologically-Based Interventions
Other Interventions
HEALTH SERVICES RESEARCH 27
Health Care Needs Assessment
Descriptive Health Services Research
Health Technology Assessment
Service Delivery and Organisation
RESEARCH CAPACITY AND THE INTERFACE WITH SERVICES 29
Strengthening Research Capacity
Nurturing the Research – Service Interface
THE VALUE OF LAY PARTICIPATION 29
Research agenda
Within specific research studies
CONCLUSIONS AND RECOMMENDATIONS 33
SPECIFIC REFERENCES and OTHER SOURCES OF INFORMATION 33
Annex 1 Membership of MRC CFS/ME Research Advisory Group 35
Annex 2 PHRU Report on Consultation Exercise 37
1. SUMMARY
2. This research strategy for CFS/ME has been developed by a Medical
Research Council CFS/ME Research Advisory Group. The Research
Advisory Group was convened in response to the request of the Department
of Health in England for the MRC to develop a broad strategy for advancing
biomedical and health services research on CFS/ME, following the publication
of the Report of the CMO’s Independent Working Group in January 2002.
3. The MRC CFS/ME Research Advisory Group fully endorses the conclusions
of the Report of the CMO’s Independent Working Group, namely that
CFS/ME is a real, serious and debilitating condition, and that research into all
aspects of CFS/ME is needed.
4. The MRC CFS/ME Research Advisory Group has used the term “CFS/ME”.
The Research Advisory Group acknowledges that the descriptive term
“CFS/ME” does not refer to a specific diagnosis. In the same manner, the
singular term “condition” is used, but this does not indicate that the MRC
CFS/ME Research Advisory Group holds any particular position on whether
CFS/ME is one condition with heterogeneity of cause, pathogenesis and
severity, or is a number of similar conditions with different individual
characteristics.
5. The MRC CFS/ME Research Advisory Group met formally (insert number)
times between September 2002 and (insert date), and held numerous other
discussions. A consultation exercise was undertaken over July and August
2002 using a set of structured questions, which was independently analysed.
The lay members of the MRC CFS/ME Research Advisory Group met with
ME charities, and CFS/ ME patients and their carers, to better understand
their perspectives. Further details on the process to be drafted in due course.
6. The MRC CFS/ME Research Advisory Group has not provided a detailed
plan for the science, nor set out an agenda of the many research projects that
might merit support. A strategy is proposed which reflects the current state of
knowledge in CFS/ME, and which aims to provide a rational framework for
advancing the understanding of the illness and to reduce suffering.
7. In considering ways to advance research on CFS/ME, the Group has focused
on a number of strategic themes: case definition, an epidemiological
framework, pathophysiology, interventions, health service research, research
capacity and the value of lay participation.
8. The MRC CFS/ME Research Advisory Group recommends that research
studies should aim to be as inclusive as possible in terms of the recruitment
of participants, and due consideration should be given to sample size to allow
for possible subgroup effects. There should be clearly stated inclusion and
exclusion criteria, with detailed justification if certain types of patients are not
included.
9. The MRC CFS/ME Research Advisory Group considers there should be an
agreed standardised case definition and a classification of severity and any
other relevant characteristics that define subgroups. Improved definition of the
phenotypes of potential subgroups that may come under the CFS/ME
spectrum, and overlaps with other conditions, will underpin research on
causes, mechanisms, and management. A definition of a clinically important
improvement in disease status, with a classification of the degree of
improvement, is essential for natural history and intervention studies.
10. In the short term, the MRC CFS/ME Research Advisory Group considers that
the research community should be encouraged to develop high quality
research proposals for funding that address key issues for CFS/ME research
that are amenable for study at the present time: case-definition,
understanding symptomology, and new approaches to management.
11. In view of the probable multiplicity of causal factors and the widely disparate
findings so far reported, the MRC CFS/ME Research Advisory Group
considers that studies investigating potential causal pathways and
mechanisms, whilst having merit, would not have the same immediate impact
on increasing understanding of CFS/ME, nor reducing the suffering of
patients.
12. The MRC CFS/ME Research Advisory Group considers it is appropriate to
explore potential interventions for CFS/ME in the absence of knowledge of
causation or pathogenesis. Randomised controlled trials of adequate size,
using standardised case definitions, eligibility criteria, and baseline and
outcome assessments, could be used to evaluate one or more of the
interventions which have been shown in one or more trials to have a benefit.
Standardisation will allow results to be more widely generalised and
compared between studies.
13. Given the present difficulties in identifying priorities for health services
research in CFS/ME, it is not clear whether it is appropriate to make HSR a
priority at this time.
14. It is essential that the researcher–funder-lay partnership is nurtured, to ensure
that the best evidence is easily available to all, and to facilitate the growth of
consumer involvement in the design, conduct and dissemination of research -
as a means to enhancing its quality, relevance, and credibility. The MRC
CFS/ME Research Advisory Group considers that there is a key role for
patient organisations to help attract participants to research, especially the
severely ill, and to help in the dissemination of research results.
15. INTRODUCTION
16. The Medical Research Council (MRC) CFS/ME Research Advisory Group
fully endorses the conclusions of the Report of the Chief Medical Officer’s
(CMO) Independent Working Group (2002) that CFS/ME is a real, serious and
debilitating condition.
17. The MRC CFS/ME Research Advisory Group agrees with the CMO’s
Independent Working Group that research into all aspects of CFS/ME is
needed, and welcomes the opportunity to help advance research into this
illness.
18. In considering ways to advance research on CFS/ME, the Group has focused
on a number of strategic themes, which are reflected in the headings used in
the remainder of this document. They correspond with the topics outlined in
the research recommendations of the report of the CMO’s Independent
Working Group.
! Research and refinement of case definition
! Development of an epidemiological framework
! Developing and testing hypotheses about pathophysiology
! Design and evaluation of interventions
! Health service research
! Research capacity and the interface with services
! The value of lay participation
19. The MRC CFS/ME Research Advisory Group has not presumed to provide a
detailed plan for the science, nor set out a prescriptive portfolio of the many
research projects that might merit support. A strategy is proposed which
reflects the current state of knowledge in CFS/ME, and which aims to provide
a rational framework for advancing the understanding of the illness and its
management.
20. The Group considers that this strategy should be available to all interested
parties, to help take forward research in CFS/ME.
21. BACKGROUND
22. In 1998, the Chief Medical Officer (CMO) in England requested that an
Independent Working Group be set up, whose terms of reference were:
! “to review management and practice in the field of CFS/ME with the
aim of providing best practice guidance for professionals, patients, and
carers to improve the quality of care and treatment for people with
CFS/ME, in particular to:
! develop good clinical practice guidance on the healthcare
management of CFS/ME for NHS professionals, using best available
evidence;
! make recommendations for further research into the care and
treatment of people with CFS/ME;
! identify areas which might require further work and make
recommendations to CMO."
23. The Report of the CMO’s Independent Working Group on CFS/ME was
published in January 2002, recommending research on all aspects of CFS /
ME. The Department of Health asked the MRC to develop a broad strategy
for advancing biomedical and health services research on CFS/ME.
24. The MRC agreed to convene a CFS/ME Research Advisory Group
(membership at Annex1), made up of individuals who were not active in the
CFS/ME field, but had the relevant scientific expertise, to discuss the CMO’s
Independent Working Group report and make research recommendations to
the MRC of possible ways forward.
25. The Terms of Reference for the MRC CFS/ME Research Advisory Group
were:
! To consider the Report of the CMO’s Independent Working Group on
CFS/ME, including its recommendations for research,
! To consider other recent reviews of current knowledge and understanding
of CFS/ME,
! To take account of patient and lay perspectives,
! To recommend to MRC a research strategy to advance understanding of
the aetiology, epidemiology and biology of CFS/ME and,
! In the light of current knowledge suggest what areas of further research
are needed with regard to possible prevention, management (including
diagnosis) and treatment.
26. The MRC CFS/ME Research Advisory Group agreed not to revisit the areas
considered by the CMO’s Independent Working Group, but to recommend
how research that would improve understanding and treatment of CFS/ME
might be undertaken. It was agreed that it was beyond the remit of the
Research Advisory Group to decide how the recommendations for a research
strategy should be implemented, as this would be the responsibility of funders
and sponsors.
27. Whilst acknowledging the seriousness of the illness, not only to the affected
individual but also to their carers, families and society, the MRC CFS/ME
Research Advisory Group did not consider the issue of service provision as
this area was not within its role.
28. Method of Working – to be finalised
29. The MRC CFS/ME Research Advisory Group met formally (insert number)
times between September 2002 and (insert date), and held numerous other
discussions. A public consultation exercise was undertaken over July and
August 2002 using a set of structured questions. The NHS Public Health
Resource Unit, Oxford (PHRU) undertook an independent qualitative analysis
of the 187 responses received, and prepared a report for consideration by the
Group (Annex 2).
30. The lay members of the MRC CFS/ME Research Advisory Group met with
ME charities, and CFS/ ME patients and their carers, to better understand
their perspectives. Their understanding of the illness was enhanced by
numerous letters from individuals who gave a personal perspective.
31. All members of the Research Advisory Group contributed preliminary drafts in
areas relevant to their expertise, which were brought together into a single
document, which was discussed by the Research Advisory Group at its
second meeting and revised subsequently.
32. A preliminary draft research strategy was made available for external, open
consultation to key stakeholders, national and international researchers, and
also considered by the MRC Research Boards between December 2002 and
February 2003. t
33. – to be completed and finalised in due course
34. Terminology
35. Chronic fatigue syndrome (CFS) and myalgic encephalomyelitis or
encephalopathy (ME) are two terms that have been used most often as the
illness description given to patients with a combination of non-specific
symptoms, but always with unexplained disabling fatigue. The CMO’s
Independent Working Group report discussed at length the issues
surrounding nomenclature, and the MRC CFS/ME Research Advisory Group
did not revisit this topic.
36. In order to develop a research strategy in this area without delay, the MRC
CFS/ME Research Advisory Group agreed with CMO’s Independent Working
Group and used the term “CFS/ME”. The Research Advisory Group
acknowledges that the descriptive term “CFS/ME” does not refer to a specific
diagnosis, and that a number of diagnostic criteria are being used to define
patients. There are separate entries in the World Health Organisation’s
International Classification of Diseases (ICD-10) for “chronic fatigue
syndrome” and “myalgic encephalomyelitis”, but it is not clear whether such a
distinction has empirical validity. In the same manner, this report may use the
singular term “condition”, but this should not indicate that the MRC CFS/ME
Research Advisory Group holds any particular position on whether CFS/ME is
one condition with heterogeneity of cause, pathogenesis and severity, or is a
number of similar conditions with different individual characteristics.
37. To avoid potential confusion, in this report “CFS” will be used when
discussing research findings where the specific diagnostic criteria for chronic
fatigue syndrome were used in those studies, and “CFS/ME” will be used as
the descriptive term for the illness.
38. It is acknowledged that, as our understanding of the area increases, such an
umbrella term as CFS/ME may no longer be appropriate. However, at the
present time it is considered that an inclusive approach is beneficial in the
development of a research strategy.
39. TAKING FORWARD RESEARCH INTO CFS/ME
40. There are a number of challenges to advancing the understanding of
CFS/ME, which arise from the heterogeneous nature of the condition, the
individual symptoms that may be associated with it and their variation in
severity, co-morbidity with other conditions, and the variability of response to
potential interventions.
41. The MRC CFS/ME Research Advisory Group recognises the urgent need for
research into CFS/ME, and that there are certain groups of patients who have
not been adequately included in research. The report of the CMO’s
Independent Working Group highlighted the severely ill, children, ethnic
minorities and the recovered patient. In the consultation exercise undertaken
at the start of the process of developing a research strategy for CFS/ME, the
inclusion of these patient groups was emphasised as being essential. The
MRC CFS/ME Research Advisory Group reaffirms the need for these groups
to be fully involved in the research effort to understand CFS/ME.
42. CFS/ME patients may vary in the intensity and nature of their symptoms, both
between patients and over time for individuals, and it will be important to
ensure that adequate consideration is given to how these potential
confounding factors are addressed. An important question is the extent to
which CFS/ME overlaps with other disorders.
43. In addition to these symptomatic issues, CFS/ME affects the whole age
range, which brings additional complexities to undertaking research. The
understanding of the aetiology and outcome for children with CFS/ME is, at
present, an area that is under-researched. It is likely that interventions
developed for an adult may need significant modification before they could be
evaluated in children. There are particular ethical dimensions to children
participating in research which must be considered in great depth by
researchers, and the rights of the child must remain paramount. Whilst
acknowledging the importance of research with children, the MRC CFS/ME
Research Advisory Group endorses the principle that for ethical reasons
research involving children should only be undertaken when it is not
appropriate to undertake such studies in adults.
44. The report of the CMO’s Independent Working Group highlighted the
importance of understanding the particular problems experienced by the most
severely ill patients. This patient group was also identified by many
respondents of the MRC consultation exercise as being a priority area for
research. There are many potentially informative comparisons to be made
between severely affected patients, who tend to have a poor prognosis, and
those individuals who recover, to a greater or lesser extent, both in terms of
understanding aetiology and of the reported differential outcomes to a number
of potential management or treatment strategies. Such comparisons may help
to identify subgroups, either in terms of aetiological mechanisms or predictors
of response to interventions. The pathways to chronicity and severity are not
at present understood, and this is a key area for research. There should be a
concerted effort to engage severely affected patients in research. At present
there is a danger that these individuals, who sometimes experience difficulties
in accessing care, might not be included in studies either based in, or
recruited from, that care setting.
45. The MRC CFS/ME Research Advisory Group recommends that research
studies should aim to be as inclusive as possible in terms of the recruitment of
participants, and due consideration should be given to sample size to allow
for possible subgroup effects. There should be clearly stated inclusion and
exclusion criteria, with detailed justification if certain types of patient are not
included.
46. The range and severity of symptoms for people with CFS/ME mean that
researchers must bear such variability in mind when designing studies. It is
important that the possibility of selection bias is considered at the earliest
stages of any study, as symptomatic patients referred to speciality clinics may
not reflect accurately the majority of patients in the general medical setting.
47. An integrated approach to determining causal pathways is needed. It could
combine structural, functional, behavioural and possibly genetic approaches.
As is the case for many chronic diseases, there is limited utility in considering
particular symptoms in isolation. It is likely that a more holistic approach may
be more fruitful in understanding CFS/ME, and potential therapeutic
interventions. There is undoubted benefit to employing a multidisciplinary
approach to research on CFS/ME, where experience and expertise from
appropriate disciplines can be brought together.
48. The current understanding of CFS/ME would imply that there are a number of
potential triggering factors for the illness. The report of the CMO’s
Independent Working Group cited infections, immunisations, life events,
physical injuries and environmental toxins as potential triggers, although the
strength of evidence is extremely variable, as discussed by the recent report
of a Working Group convened under the auspices of the Royal Australasian
College of Physicians (2002). Predisposing factors included gender, familial,
personality, other disorders and previous mood disorder. Given that the
causes of CFS/ME are probably diverse and multi-factorial, identification of
specific causal pathways may be of limited value in understanding and
treating the illness. It is entirely possible that an original precipitating factor
may no longer be detectable in a person with CFS/ME, or was present at a
subclinical level, and thus reported abnormalities may not reflect a true causal
association.
49. Many reported findings in the area of pathophysiology are not published in the
peer-reviewed literature, or are not well described. Such preliminary findings
need to be confirmed by independent replication in other centres. Currently,
the low volume of research and the lack of methodological rigour and
independent replication mean that many of these claims find little support
from the wider scientific community, but may have strong currency among
some patients and practitioners.
50. Findings need be subjected to rigorous and objective scientific analysis and
published in high quality, peer reviewed journals, not least so that the
methods can be replicated and the findings and hypotheses tested
independently by other approaches. Where independent replication and
different approaches fail to demonstrate a significant association, the case for
further work is likely to be weak. Well substantiated, refined hypotheses can
then be tested through a variety of other designs.
51. The MRC CFS/ME Research Advisory Group is aware of the difficulty in
publishing negative results, especially in peer-reviewed journals. The Group
considered it important, especially in an area as complex as CFS/ME, that the
results of such research should be disseminated to avoid unnecessary
repetition of studies and the inefficient use of resources. There may be a need
for funders and sponsors of research to investigate additional alternative
mechanisms of dissemination, preferably involving an independent peerreview
mechanism to provide scientific credibility to the results. The MRC has a
reputation for rigorous peer-review, and may need to take the lead in such an
endeavour, in partnership with other funders and sponsors if necessary.
52. The MRC CFS/ME Research Advisory Group has been mindful throughout
the development of the research strategy for CFS/ME of the importance of
following existing guidance and approval systems in research. The MRC,
amongst others, has published a number of relevant guidance documents, to
which researchers should refer (e.g. MRC Ethics Series Human Tissue and
Biological Samples for Use in Research, Good Clinical Practice in Clinical
Trials). It is the responsibility of all researchers to ensure that any research
they wish to undertake has obtained the relevant ethical approvals.
53. The MRC CFS/ME Research Advisory Group acknowledges the importance
of understanding the international research effort for CFS/ME, in order to
optimise the likely success of any research strategy. There are substantial
programmes of research currently underway in other countries, such as the
United States of America, Australia, and a number of European countries.
The Research Advisory Group was grateful for the information provided by
the US Center for Disease Control about its current research programmes. It
will be important that researchers and funders take an international
perspective when considering the funding of specific research proposals.
54. Research and Refinement of Case Definition
55. Improved definition of the phenotypes of potential subgroups that may come
under the CFS/ME spectrum, and overlaps with other conditions, will underpin
research on causes and mechanisms. Accuracy and consistency of case
definition and diagnosis is a crucial issue both for services and for research.
Improvements will help researchers compare different studies with each other
and across time. Further research is needed to develop and evaluate the
tools for case definition. The lack of validated biological markers for CFS/ME
has further hampered diagnosis.
56. Case definition is fundamental for the assessment, frequency, causes,
outcomes and management of any disease or illness. The development and
validation of instruments for use in research and in services is currently a key
area for research. Consistency between studies and over time can
significantly affect the interpretation of research findings.
57. There is clearly an overlap between the need for case definitions that have
utility in the clinical and service context with those specifically designed for
research. For this reason a continuing cross-reference between research
targeting fundamental questions and that aimed at developing and evaluating
tools for services is essential.
58. There is some international consensus on the broad criteria used to identify
people with CFS, as demonstrated by the current consensus-based
definitions from the US Centers for Disease Control (CDC), currently known
as the Fukuda criteria (Fukuda et al. 1994). However, questions remain
about the interpretation of conditions that fall within these broad criteria. Some
consider that this inclusive approach compromises research on specific
groups of individuals whose symptoms are considered to be predominantly
neurological, as indicated in the Consultation exercise.
59. The MRC CFS/ME Research Advisory Group is aware of the ongoing
effort of the CDC, through an International CFS Study Group, to refine the
current research case definition of CFS. There have been three meetings
of international experts from a wide range of disciplines and perspectives,
coordinated by the CDC, in an effort to identify ambiguities in the current
CFS case definition and to recommend improvements. We understand that
this International CFS Study Group is currently preparing a report for peer-
reviewed publication in an academic journal, and we would anticipate that
this consensus-derived research case definition will help in the development
of well-designed studies. Any new or revised case definition must be subjected
to rigorous and objective scientific analysis and testing to demonstrate its
usefulness.
60. The MRC CFS/ME Research Advisory Group has noted that there is support
among some sections of the community for the use of the description of M.E.
from Ramsay (Ramsay, 1998) to identify and study a discrete population of
patients. Whilst acknowledging the potential importance of the identification
of subgroups, the Group does not consider that the current descriptive nature
of these criteria has sufficient methodological rigour to be used in an
epidemiologically robust manner for research. The MRC CFS/ME Research
Advisory Group believes that researchers who wish to pursue this approach
will need to operationalise the Ramsay criteria and then demonstrate their
validity through peer-reviewed publication.
61. The MRC CFS/ME Research Advisory Group considers that case definition is
a key area for research, but believes that it is possible that some studies can
be undertaken without delay in reaching consensus. The use of broad, but
clearly and explicitly defined, inclusion and exclusion criteria should allow
subsequent re-appraisal of experimental results in the light of developments
in case definition. It would not be possible to identify potential subgroups
unless inclusion criteria are broad enough to encompass the necessary
heterogeneity.
62. Developing the Epidemiological Framework
63. Epidemiology has a central role in addressing questions about prevalence,
incidence and their relation to time, place and person within populations. It is
key in formal testing of causal hypotheses, specifically in working out the
contributions of environment and genetic influences. Such a framework is
also necessary for research on case definition, co-morbidity, natural history
and outcome.
64. Population-based studies that identify affected individuals using active
ascertainment and agreed diagnostic criteria have several advantages,
including the provision of adequate numbers of affected individuals, identified
using a common methodology, to test important hypotheses about causes
and to provide unbiased estimates of outcome. The fact that CFS/ME affects
the whole age-range, including children, means that such population-based
studies will need to have considered the adequacy of case ascertainment
across the whole age spectrum.
65. Considerable advances are being made internationally towards identifying
candidate genes for a wide variety of disorders. New, large epidemiological
studies that include genetic data could allow such advances in CFS/ME to be
taken forward fairly rapidly, in the context of a general population sample, to
address questions about genes and environment. While there is excitement
about these advances, examples from other areas of biomedicine make it
clear that to identify genetic susceptibility loci and determine how they interact
is a complex task requiring a substantial, multidisciplinary research effort. As
with all other genetic studies, precise case definition and phenotypic
categorisation of each case is vital, and it may be premature at this stage to
undertake large scale genetic studies of CFS/ME until there are clearly
agreed and validated diagnostic tools.
66. Large epidemiological studies can contribute well-characterised cohorts for
prospective investigation of longer term outcomes. Such a cohort, of affected
people ascertained over a relatively short period of time, is likely to be
qualitatively different from health service registers developed for needs
assessment and health service planning. However, some overlap may exist
where researchers work particularly closely with health services.
67. There is a lack of basic epidemiological evidence to help develop effective
prevention strategies and management options for CFS/ME. This may stem
from difficulties about definition and diagnosis of CFS/ME, as well as from the
historical failure to recognise CFS/ME as an illness. Once these constraints
are removed a programme of epidemiological research will become an
important priority. Three types of study are needed: descriptive epidemiology,
studies of aetiology, and epidemiological studies of characteristics associated
with outcome.
68. Descriptive Epidemiology
69. Basic descriptive epidemiology of population patterns is required to describe
both the incidence and prevalence of CFS/ME, and its duration, nature, and
severity, in terms of patient characteristics. Studies should pay particular
attention to the duration and nature of the symptoms experienced, especially
in terms of whether CFS/ME is a single syndrome or whether there are
several distinct sub-groups; the severity of symptoms, especially in terms of
the extent and types of disability (physical and cognitive) and pain
experienced and the age, sex and ethnicity of patients.
70. The UK is uniquely placed to undertake studies of prevalence and incidence
through primary care. Primary care research networks, such as the MRC
General Practice Framework, could provide a study population. If studies
were undertaken in practices which are linked into computerised practice
management systems, incidence could be studied as well as prevalence.
Fundamental to such a study would be an agreed research case definition.
71. A linked natural history study might be undertaken based on primary care and
using those practices in computer-based networks, relying largely on routine
health records. A standardised follow-up of cases identified either from
prevalence or incidence studies would be a much larger undertaking but not
impossible within primary care networks. An important caveat to be borne in
mind is the quality and reliability of computerised health records.
72. Aetiology
73. Aetiological studies could be used to identify characteristics of people, their
physical, work, and social environments, and health histories associated with
the development of CFS/ME by duration, nature and severity of CFS/ME.
These studies would need to follow on from basic research into possible
mechanisms of the development of chronic fatigue so that hypotheses about
aetiological factors can be clearly formulated (e.g. to environmental factors),
and will need to pay particular attention to physical and psychological
challenges. Such studies could be conducted as prospective cohort studies
comparing populations exposed and unexposed to putative aetiological
agents. However, it is possible that incidence would be too low to make such
studies feasible and it may be necessary to consider case-control studies that
retrospectively examine exposure.
74. It would be particularly helpful if such studies were designed so that they
could answer important outstanding issues around whether neurological and
psychological symptoms found in CFS/ME patients are causally related, are
consequences of the illness, or a combination of the two.
75. Outcome Studies
76. The current evidence indicates that CFS/ME patients exhibit wide variation in
the time to recovery, with some seriously affected patients never fully
recovering. There is, however, little evidence about which patients recover, or
what factors pre-dispose to recovery. Once outcomes have been clearly
defined, longitudinal studies of cohorts of CFS/ME patients are needed to try
to identify these factors. Very few studies have looked at patterns of
recovery, which the MRC CFS/ME Research Advisory Group considers to be
a potentially fruitful area of research.
77. Possibilities for research into potential treatments and management strategies
are considered in more detail below.
78. Developing Hypotheses about Pathophysiology
79. A wide range and variety of factors have been suggested to play a role in the
pathophysiology of CFS/ME, but the evidence is generally either weak or
contradictory. Greater methodological rigour and independent replication are
crucial in much of this work.
80. Many of the observations are interesting and in principle worth investigating.
Moreover, potentially modifiable risk factors are possible targets for
interventions. A useful start might be made to test such hypotheses in robust
but relatively simple research designs, so that the less likely ideas can be put
to one side and further effort and investment can focus on the areas that
preliminary evidence identifies as more likely to be productive.
81. In all studies, choices of sampling strategy, case-definition, measures and
controls are crucial and a multidisciplinary collaborative approach is likely to
be beneficial. Some studies will be amenable to case-control or other
epidemiologically- and genetically-sensitive designs, and others to
investigation in experimental models.
82. The MRC CFS/ME Research Advisory Group has not undertaken a detailed
review of the current level of scientific knowledge on the aetiology or
pathogenesis of CFS/ME, as this was not its function. The Group notes that
the recent report of a Working Group convened under the auspices of the
Royal Australasian College of Physicians (2002) has assessed the strength of
evidence for a number of factors in the pathophysiology of CFS, including
infections, immunological factors, central nervous system disturbances and a
number of other factors postulated to be involved. In most cases, the
evidence base was not large, with information coming from only a few studies,
and often conflicting. As a consequence of the lack of consistent evidence,
the MRC CFS/ME Research Advisory Group has considered a number of
broad thematic areas with regard to research on CFS/ME.
83. It should be emphasised that the research areas discussed below are not the
only ones where there is potential for advancing our understanding of the
pathogenesis of CFS/ME, but reflect the areas that currently show the most
promise. As scientific knowledge increases, other avenues of research may
become increasingly attractive.
84. Infections
85. Fatigue, cognitive disability and musculo-skeletal pain are commonly found
during the acute phase of many infectious diseases, and generally disappear
spontaneously with the emergence of a normal immune response. However,
following certain infections, a proportion of patients develop prolonged fatigue.
For example, up to 10% of patients with diagnosed infectious mononucleosis
(infection with the Epstein-Barr virus, EBV) or Q fever (Coxiella burnetti
infection) can develop chronic post-infectious fatigue. However the causes of
these chronic responses to infections in a minority of patients are not known.
86. It is clear that no single infectious cause of CFS/ME has been identified.
Although EBV can lead to CFS/ME, in the great majority of cases no
infectious cause can be found by routine microbiological investigation. There
is reasonably strong evidence that retroviruses and enteroviruses are not
causally related to CFS/ME.
87. Infection with the hepatitis C virus (HCV) may lead to fatigue, and treatment of
HCV-infected patients with interferon-alpha leads to symptoms
indistinguishable from CFS/ME, including fatigue, cognitive dysfunction and
pain. Pathophysiological investigation of well-defined conditions such as this
may represent a reproducible model for CFS/ME.
88. Many studies that report a causal association between an infection and
subsequent CFS/ME have reported the detection of antibodies against the
viral or non-viral agent in patients with CFS/ME, and draw the conclusion that
such raised levels of antibodies reflect chronic active infection. However
healthy individuals may also demonstrate raised antibody levels, many years
after the original infection. The Working Group of the Royal College of
Australasian Physicians noted that raised titres of antibodies against common
viruses are often found, but are not of pathophysiological or diagnostic
significance.
89. Recent advances in virology and bacteriology enable the detection and
quantification of organisms directly through amplification of their genomes, by
the polymerase chain reaction (PCR). PCR technology will provide a more
robust methodology than antibody detection for the association of known
organisms with CFS/ME within cohort studies.
90. The discovery and gene sequencing of new viruses and application of PCR
will allow the investigation of patients with CFS/ME for novel viruses, for
example through the use of degenerative primers or differential display PCR.
91. The application of the novel technologies to bacteriology has allowed the
identification of non-culturable organisms, for example through the 16S rRNA
PCR assay. Assays such as these would allow the exploration of a CFS/ME
patient cohort for novel bacterial infection.
92. Advances in genomics brought about through the human genome programme
will also allow the investigation of DNA from patients and controls for the
expression of novel mRNAs associated with CFS/ME.
93. Application of these new technologies for the investigation of new or known
organisms with CFS/ME would be most epidemiologically relevant within a
cohort study, where defined patients and controls could be studied.
94. Neurology
95. As the report of the Working Group of the Royal College of Australasian
Physicians indicated, there is conflicting evidence for neurological
abnormalities in CFS/ME, but good evidence that muscle strength, endurance
and recovery are normal. The early reports of inflammation of the brain, spinal
cord or muscles have not been confirmed. It should be borne in mind that it is
likely that abnormalities may be detected in the neuromuscular system of
patients who are severely ill with CFS/ME and possibly immobile, in
comparison to healthy controls. However, abnormalities have been
demonstrated in individuals who have restricted mobility for other clinical
reasons.
96. Clinical experience would indicate that most patients with CFS/ME have
neurological signs that lie within the normal range. The initial reports of
inflammation of the brain, spinal cord or muscles have not been confirmed.
Imaging studies using computerised tomography or magnetic resonance
scans can demonstrate detailed brain structure but do not provide information
about brain function. There are reports in the literature of white matter
changes but these are variable and non-specific. Furthermore such imaging
techniques are prone to misinterpretation if there are subtle differences in
brain structure.
97. Functional imaging of various types (magnetic resonance (MR), single photon
emission computerised tomography (SPECT) and positron emission
tomography (PET)) are relatively new techniques to have been developed.
Studies from other conditions have demonstrated the many difficulties in
interpreting abnormalities – particularly in determining whether or not such
suspected abnormalities are primary or secondary phenomena. It would
seem possible that functional imaging might be used in the study of CFS/ME,
but such studies are heavily reliant upon clearly defined, homogeneous
groups of participants who are investigated in a consistent manner, with
appropriate controls (and not just healthy volunteers).
98. At present, it is not clear that performing invasive, and hence potentially
dangerous, tests such as obtaining cerebrospinal fluid at lumbar puncture or
performing muscle biopsy would be appropriate, unless clinically justified.
Therefore any studies that proposed such tests would need to be very
carefully considered, as there may be serious ethical dilemmas, especially in
the case of children.
99. Muscle Fatigue and Weakness
100. Muscle weakness can be defined as the inability to generate the required or
expected force output, whilst muscle fatigue can be defined as the inability to
maintain the required or expected force output. Problems with the generation
or maintenance of force output can occur at any point in the ‘chain of
contraction command’ ranging from the brain to the muscle architecture itself.
In terms of muscle weakness problems may occur with electro-mechanical
activation (e.g. impaired neuromuscular transmission; impaired excitation
contraction coupling), fuel supply (e.g. reduced short term energy stores;
impaired energy exchange) and/or the contractile machinery (e.g. smaller
muscle cells, fewer muscle cells).
101. Muscle fatigue can be considered in terms of its central or peripheral origin. If
the fatigue is centrally mediated, the mechanisms, if not due to problems with
motivation, are likely to be due to a failure to sustain the number and/or
stimulation frequency of recruited motor units. If peripherally mediated,
mechanisms of fatigue can include impaired neuromuscular transmission
and/or propagation of the muscle action potential and/or impaired
excitation/contraction coupling.
102. Many well-validated scientific techniques now exist to determine at which
point in the command chain problems may arise. These techniques in turn
enable the elucidation of the mechanisms responsible for the weakness or
fatigue, including for example: muscle biopsy, strength testing (voluntary and
electrical), electromyography, ultrasonography and magnetic resonance
imaging. Many of these techniques have already been employed in the
assessment of muscle weakness and fatigue associated with CFS/ME. The
general opinion arising from these studies is that there is no physiological
basis to the weakness and/or fatigue. These are general assertions however,
and at no point has the literature been systematically reviewed to determine
the scientific rigor or generalisability of the research findings.
103. A key step with regard to undertaking further research in this area might be to
undertake a full systematic review of the literature relating to the assessment
of musculo-skeletal weakness and fatigue associated with CFS/ME. Such a
review could establish current gaps in the research evidence and could inform
recommendations for any further physiological assessments.
104. Immunology
105. There does not seem to be a consensus on the nature and extent of
immunological disturbances in CFS/ME, even though there are numerous
reports of immunological alterations. There appears to be conflicting evidence
for a variety of potential immunological factors in the pathophysiology of
CFS/ME (such as reduced lymphoctye proliferation and activation status,
levels of specific immunoglobulins, or autoimmune conditions). The Report of
the Royal Australasian College of Physicians Working Group suggested that
the heterogeneity of findings might be explained in terms of variations in
methodology and also inadequate consideration of potential confounding
variables.
106. Bidirectional interactions between the immune system, inflammatory or
infected tissue(s) and the central nervous system (CNS) are now well
established, particularly in experimental animal models. Thus systemic or
local disease or injury in peripheral tissues activates neural and humoral
afferent signals to the CNS. The brain regulates and co-ordinates many
aspects of the acute phase response including induction of fever, slow wave
sleep, lethargy, loss of appetite and body weight, and modulation of
endocrine, immune and cardiovascular systems. Furthermore the brain,
previously considered as an “immune privileged organ”, can exhibit
inflammatory responses which contribute to local and systemic disease.
Cytokines are primary mediators and modulators of these responses, and
proinflammatory cytokines act in the brain to induce a syndrome known as
“sickness behaviour syndrome” which includes reduced motivation and
responsiveness, lethargy and loss of appetite (Konsman et al., 2002). All of
these responses are profoundly influenced by environmental stress, by
endocrine status (particularly the activity of the hypothalamic-pituitary-adrenal
axis) and by genetic background and gender in experimental animals.
107. Obvious parallels can be drawn between the findings of research on
neuroimmune interactions, the CNS response to injury, cytokine neurobiology
and CFS/ME. The growing field of psycho-neuro-endocrine-immunology,
which seeks to understand the interactions between environmental stresses
(including psychological and immune factors) and the immune, endocrine and
nervous systems may by of direct relevance to our understanding of some
aspects of CFS/ME. Limited data provide some support for the roles of
cytokines in CFS/ME, but this is a notoriously difficult area to study because
cytokines generally act locally within tissues rather than in circulation (and
therefore their concentrations and actions are difficult to access), and exhibit
complex and diverse actions.
108. Animal studies in the area of neuroimmunology, particularly in “sickness
behaviour syndrome”, have potential implications for CFS/ME. It will be
important to develop and study chronic, rather than acute, models of
“sickness behaviour syndrome”, to assess outcomes and influences relevant
to CFS/ME (such as objective measures of lethargy, fatigue, and impact of
exercise) and to elucidate potential mechanisms and interventions.
109. Clinical neuroimmunological studies are much more difficult to undertake, and
measurements of inflammatory mediators (e.g. cytokines) in the blood
circulation are likely to be of limited value (see above). However,
comparisons of cytokine responses to immune/inflammatory challenges or
levels within some tissues can be assessed, and may be compared in
patients with varying severity of CFS/ME or after recovery, with healthy controls.
110. Understanding inflammation in the brain has generally been restricted to post
mortem studies or analysis of brain tissue or cerebrospinal fluid – techniques
which are not readily amenable in CFS/ME patients. However recent
developments in PET imaging allow assessment of activated microglia.
Analysis of known polymorphisms in the genes of inflammatory mediators,
which have been linked to other chronic inflammatory diseases, may be of
some value within large epidemiological studies of CFS/ME.
111. Neuroendocrinology
112. Several lines of evidence would indicate that there are neuroendocrinological
abnormalities found in some CFS/ME patients, although it is unclear whether
these are causal or secondary in nature. The reported disturbances in the
hypothalamic-pituitary-adrenal (HPA) axis could be due to a number of
factors, including disturbance of central neurotransmitters such as serotonin
or, more likely, a malfunctioning of the complex relationship between cortisol
and these transmitters. The reported abnormalities are dissimilar to those
found in patients with major depression, which would indicate that there are
different underlying processes for the two conditions. The high degree of comorbidity
of CFS/ME and depression would, however, mean that studies in
this area are fraught with potential confounds.
113. The interpretation of basal cortisol levels is problematic, and experiences from
studies of other conditions have demonstrated many potential pitfalls.
However, investigations into disordered functioning of the HPA axis can be
undertaken through the use of specific challenge studies, using for example
corticotrophin releasing hormone, adrenocorticotrophic hormone or serotonin
agonists. However studies to date have provided equivocal data, possibly due
to the heterogeneous nature of the patient groups being studied, although
methodological problems may also have contributed to the uncertainty.
114. One area where neuroendocrinological studies may prove informative is in the
study of circadian rhythms and sleep architecture, both of which are affected
by disordered neuroendocrine function. There is currently conflicting evidence
of disturbed circadian rhythms in people with CFS/ME, but sleep disruption is
a commonly reported symptom of the illness.
115. There have been a small number of studies investigating the potential
therapeutic benefit of neuroendocrinological manipulations. However, whilst
some studies have shown some promise, the serious side-effects associated
with long term use of corticosteroids would indicate that more basic research
would be needed to justify their use as a therapeutic agent.
116. Central Nervous System Function
117. Key symptoms of CFS/ME include fatigue, cognitive dysfunction and sleep
disturbance, which are associated with disordered functioning of the CNS. It is
uncertain whether this disordered functioning is solely a consequence of a
primary abnormality in the brain or is mediated by changes in circulating CNS
modulators such as hormones and cytokines, or neural afferent signals.
118. Limited laboratory studies of people with CFS suggest abnormalities in the
function of the hypothalamic-pituitary-adrenal axis and brain monoamine
pathways, particularly serotonin. Changes in sleep architecture are also
frequent. The abnormalities reported differ clearly from those observed in
patients with depressive disorders, though the two conditions commonly coexist.
119. It is also uncertain whether the various neurobiological changes that have
been reported in CFS/ME are involved in the pathophysiology of the disorder
or are a consequence of the illness and persistent inactivity. To resolve this
important issue, longitudinal studies of people throughout the course of their
illness may be required. Such work could be usefully integrated with
psychological treatment studies. In this way it should be possible to see if
abnormalities are trait or state markers and whether their presence has
prognostic significance. Another, potentially quicker, approach would be to
carry out cross-sectional studies of people who have made good clinical
recoveries from CFS/ME to find evidence of enduring biological “vulnerability”
factors.
120. It could also be informative to carry out neurobiological studies of
prospectively selected groups of participants who are known to be at high risk
of CFS/ME-like symptoms (e.g. those infected with Epstein-Barr virus and
patients receiving treatment with interferon for hepatitis). Such an approach
may reveal which biological abnormalities appear to be associated with the
development of fatigue symptoms and might therefore be involved in their
pathophysiology.
121. It will also be important to investigate the brain pathways that underlie the
symptoms of CFS/ME. The use of SPECT imaging to study regional cerebral
blood flow in CFS has yielded inconsistent results. However specific ligands
for PET and SPECT are becoming increasingly available and may allow the
delineation of regional neurotransmitter and neurochemical abnormalities.
Functional magnetic resonance imaging (fMRI) studies may help elucidate the
brain pathways that underpin the cognitive impairments in CFS/ME, in a
similar way to that employed in the study of cognitive deficits in mood
disorders. These imaging changes might provide clues for the development of
novel treatments for the cognitive dysfunction in CFS/ME, as well as a way of
monitoring changes in cortical functioning through rehabilitation and clinical
improvement.
122. Chronic pain is a widely reported symptom of CFS/ME, but there would
appear to be little research into this aspect of the illness. There are a number
of potential avenues for research, which could build on the knowledge gained
in other chronic conditions such as multiple sclerosis. The use of functional
imaging techniques may be especially useful in elucidating the centrally
mediated aspects of pain perception.
123. It will also be important to obtain more understanding of the central processes
that mediate fatigue in healthy animals and humans. A better knowledge of
the neurobiology might yield clues to the pathophysiology of clinical fatigue
states and provide new targets for treatment.
124. Cognitive Performance
125. People with CFS/ME not only report difficulties with disabling fatigue but also
with cognition. Any studies in cognition must consider a number of key factors
in assessing the levels of impairment that are present in the disorder. These
factors include the heterogeneity of presentations and levels of severity, the
presence of psychiatric factors such as co-morbid mood disorder, as well as
possible relationships between brain dysfunction and cognition.
126. The majority of studies have shown little change in overall intellectual
functioning. There is good evidence of attention and concentration problems
in CFS/ME. However, despite reproducible demonstration of some reduction
in performance, the specific nature of such deficits has not been identified. In
particular the attention dysfunction may be a global non-specific impairment
or a specific one relating to selective attention.
127. The research in this area has tended to involve small samples of patients and
a small number of tasks, with few studies involving more than 40 participants
per group. Any study attempting to identify subtle deficits will need to include
an adequate number of participants. The variability of results in this area may
be due to the small numbers in most previous studies.
128. The understanding of memory impairment in CFS/ME is, at present, limited.
The effects of suggestibility on the subjective and objective experience of
impairment have only recently begun to be investigated.
129. There seems to be a positive relationship between objective measures of
cognitive impairment and symptoms of depression in CFS patients. However
depression in CFS patients only accounts for a small amount of the variance
in the subjective complaints of poor cognitive performance, even when there
are no differences between CFS patients and healthy controls.
130. The level of model testing in the area of cognitive impairment in CFS/ME is
poor. The variability in the results of studies in this area mirrors that of studies
of other symptom areas. It seems highly likely that a number of different
variables will affect both objective and subjective cognitive performance.
These variables need to be identified and tested with confirmatory, as
opposed to exploratory, analyses in studies with sufficiently large sample
sizes to prevent statistical errors (both Type I and Type II). It will also be
necessary to find objective tests of memory that have some ecological
validity.
131. Knowledge of the relevant cognitive factors could contribute to the diagnosis
of CFS/ME, a description of the changes that are seen over time as the
disorder develops (in the same way that they are used in Alzheimer’s
disease), and to the description of the impact of CFS/ME on functioning.
132. Cognitive factors could also be used as outcome measures for trials of
interventions. There is a need for agreement about how such measurements
should be made. CFS/ME patients report problems with everyday cognitive
tasks, but are tested on laboratory tasks of specific list learning or dual
tasking. These tasks do not take into account the lengthy practice that
provides the pattern or strategy for performance in everyday tasks. The
mismatch of what people thought they should be able to do and their actual
subjective assessment of their current performance also needs to be
measured.
133. It is clear that the cognitive dysfunctions in CFS/ME cannot be entirely
explained by mood variations. It should be noted that, even when cognitive
capacity is intact, cognitive performance may be affected by factors such as
arousal, mood, and strategy use.
134. Psychological factors
135. The presentation, symptoms and effects on functioning of all illnesses, both
physical and psychiatric, are affected by a variety of factors including
personality factors, coping mechanisms and social support. For example even
when it is possible to measure the scope of a disability with a physical cause,
(e.g. arthritis) the effects on quality of life can differ between individuals
depending on non-illness specific factors. The same will be true of CFS/ME,
irrespective of any causal mechanism.
136. Several studies have suggested that personality factors may differ between
those with CFS and other disorders but the available evidence is equivocal. A
prospectively designed study could allow the differentiation of the interplay
between biological and psychological factors which may influence not only the
maintenance of the disorder, but also possible types of intervention that might
be developed. Definitions of CFS/ME that include co-morbid psychiatric
problems may produce confusing evidence of the role of personality factors.
Future studies to test hypothesised models of the relationship between
biological and psychological factors must consider this potentially confounding
variable carefully.
137. A key problem when considering CFS/ME is that it is not clear when
psychological factors might play a part. Given that the co-morbidity of
CFS/ME with depression may be as high as 50%, it is often concluded that it
is integral to the disorder rather than a response to it. However there a few
studies that have addressed this issue directly. The studies have often
recruited participants from secondary care, who are therefore generally at the
more severe end of the spectrum of severity. It is, at present, not clear
whether a broader population of CFS/ME patients would allow a clearer
understanding of the influence of psychological factors.
138. INTERVENTIONS
139. The Chief Medical Officer’s Independent Working Group, in considering
therapeutic interventions, drew on a specifically commissioned systematic
review of management strategies undertaken by the NHS Centre for Reviews
and Dissemination (Whiting et al., 2001). The systematic review identified
350 studies that were considered relevant, but only 43 of these met the
inclusion criteria. Within these 43 studies, 14 different diagnostic criteria were
used to characterise participants, with 31 different interventions being tested
using 39 different outcome measures with 203 outcomes evaluated. Two
specific strategies were identified which potentially may be beneficial for
CFS/ME, graded exercise therapy (GET) and cognitive behavioural therapy
(CBT) techniques. These strategies have been tested individually, together
and in treatments that incorporate numerous different treatment approaches
including adjunctive pharmacotherapy (Whiting et al., 2001; Mulrow et al.,
2001).
140. The MRC CFS/ME Research Advisory Group has not considered in detail the
information included in the systematic review, but chosen instead to consider
how the evidence-base for potentially effective management options can be
strengthened.
141. The MRC CFS/ME Research Advisory Group considers that there are a
number of important steps to advance the evaluation of potential
management strategies or treatments for CFS/ME. There should be
agreement on a case definition and a classification of severity and any other
relevant characteristics which define subgroups (such as specific symptoms
or co-morbidities). This step is fundamental to any epidemiological study,
including clinical trials.
142. A definition of a clinically important improvement in disease status, with a
classification of the degree of improvement, is essential for natural history and
intervention studies. Thus the validation of a range of outcome measures,
and associated changes, is a key step. A review of the many measures used
to date and some pilot work to develop a package of a small number of
existing outcome measures (which have already been tested for validity and
reliability) to be widely adopted would be an important step forward.
143. A careful review of studies which have shown positive differences between
treatments and those which have not (testing the same treatments) could be
useful to understand the reasons for the differences (e.g. outcome measures,
details of interventions or chance), as most differences are small.
144. Clinical trials of interventions
145. All new potential interventions, including complex packages of care, should
ideally first be evaluated in small studies using markers of disease activity to
decide whether to proceed to larger trials. The difficulties in defining objective
outcome measures means that such studies may have positive results even
with ineffective interventions. Alternatively, interventions with only a modest
benefit might be rejected.
146. The Medical Research Council has previously considered the challenging
area of the development and evaluation of complex packages of care, and
produced a guidance document for investigators, A Framework for
Development and Evaluation of RCTs for Complex Interventions in Health
(2001). The MRC CFS/ME Research Advisory Group would strongly
recommend that researchers consider the guidance contained within that
document, which provides detailed discussion of many salient points.
147. Fundamental to all considerations about intervention studies is the need for
outcome measures which are:-
! as objective as possible (this does not mean that patients’ perceptions of
improvement are not important but relates to the difficulties in truly
blinding interventions);
! sensitive to clinically relevant changes (spontaneous or intervention–
related);
! consistent;
! represent different aspects of the syndrome;
! if appropriate, have a clinically relevant grading system;
! can be documented and consistently applied; and
! limited in number (one or a small number of primary outcomes).
148. The MRC CFS/ME Research Advisory Group considers that every attempt
should be made to reduce potential bias in clinical trials (e.g. by use of
randomisation and blinding). The attraction of cross-over designs needs to be
weighed against the problem of blinding, which is even more difficult within
individual patients. Factorial designs may be valuable to assess more than
one intervention but the possibilities of interactions must be kept in mind.
149. For each trial the balance between broad eligibility criteria with consequent
generalisability and selection of subgroups most likely to respond to a specific
intervention must be considered. The need to assess a promising
intervention in all types of patients must be balanced against the
demonstration of ‘proof of concept’ in a well-defined group. The latter may be
the first stage before extending to a broader group. People who cannot
attend clinics should not be excluded, and efforts should be made to allow the
most severely ill to participate.
150. It is appropriate to explore potential interventions in the absence of knowledge
of causation or pathogenesis. The need to adequately define and document
complex interventions so that they can be replicated accurately is crucial.
The duration of the intervention should be adequate to achieve benefit and
the follow-up after the intervention should be long enough to determine if the
effect is sustained.
151. All trials should be large enough to have reasonable power to detect a
clinically useful effect in the primary outcome. The need to have more than
one trial to reliably assess risks and benefits is even greater in these
circumstances, with added benefits of being able to combine the results later.
152. The importance of following up all the participants, even if they withdraw from
treatment and of undertaking an intention to treat analysis on as complete a
population as possible cannot be emphasised too strongly. The problems of
interpretation associated with other techniques such as excluding
withdrawals, “on treatment” analyses and “last observation carried forward”
which may over-estimate treatment effects are well-known.
153. The problems with most of the trials to date, as described in the review from
Whiting et al. (2001) is that very few fulfil all of these criteria. The MRC
CFS/ME Research Advisory Group believe that researchers should consider
from the outset the comprehensive reporting required of any intervention
study, to allow others to understand the design, conduct, analysis and
interpretation of that study. The use of the CONSORT recommendations
(Moher et al., 2001) should allow others in the field to assess the validity of
the results, and will facilitate systematic reviews and meta-analyses.
154. Musculo-skeletal-Based Interventions
155. There is considerable confusion and disagreement surrounding the optimum
approach to the rehabilitation of people with CFS/ME. It has been suggested
that the greater the fatigability and disability and the longer the illness duration
for an individual, the stronger the associations with a psychological
component to the process (Royal Colleges of Physicians, Psychiatrists and
General Practitioners, 1996). It is not clear whether the psychological
component is a result of the CFS/ME, or vice versa, or indeed whether there
is a mixture of the two. There are parallels to be drawn between patients with
CFS/ME and patients with chronic low back pain of non-specific origin. These
patients are severely disabled, frequently depressed and are wary of
participating in a rehabilitation programme in case it exacerbates their back
pain.
156. Despite the assertion from the CMO’s Independent Working Group that
patients with CFS/ME are no less fit than sedentary people, they themselves
recognise that prolonged inactivity leads to muscle wasting. This inactivity
results in a decline into a “vicious spiral of immobility”. It is very difficult to
break into this downward cycle and the key to any effective rehabilitation
programme should be to support the patient through this process.
157. The CMO’s Independent Working Group agreed that rehabilitation is
important but it should be graded, tailored to the individuals’ own needs and
must recognise that the whole process invariably needs to start from a low
baseline. Despite the recommendation that this is the best way forwards,
patients remain sceptical, as many believe the graded exercise approach
makes them worse. Any research into rehabilitation must take into account
these concerns and establish why some people experience a deterioration
whilst others find the process beneficial.
158. The MRC CFS/ME Research Advisory Group believe that it likely that an
integrated package of care will be the most beneficial in the management of
CFS/ME, as has been shown for other chronic illnesses and conditions.
Graded exercise and cognitive behavioural therapy could be considered in
isolation but the existing literature from research on both ME/CFS and chronic
low back pain would suggest this would not provide optimal benefits.
159. The multi-disciplinary, holistic ”back school” approach is an example of a
complex package of care that has proved extremely effective for those
patients with chronic intractable back pain for whom no other approach has
been effective (Nielson & Weir, 2001). This approach incorporates for
example: graded exercise, cognitive behavioural theory, pain management
and relaxation therapy. There is obvious merit in drawing upon other well
researched areas when developing and evaluating packages of care for
CFS/ME.
160. It will be important to understand why some people with CFS/ME experience
a deterioration when participating in an exercise approach to treatment. The
wealth of experience from the back pain literature should be drawn upon
when addressing how “graded” should graded exercise be and how the
optimum progression points in treatment should be determined.
161. The report of the CMO’s Independent Working Group highlighted the support
by some patients for “pacing” as a management strategy, which was also
evident from the responses received as part of the consultation process
during the development of this research strategy. At present there is no
empirical evidence of efficacy for “pacing”, which should come from
randomised controlled trials.
162. Psychologically-Based Interventions for CFS/ME
163. Evidence on the effectiveness of treatments needs to take into account the
specific outcomes that are being measured which may change at differing
rates. Various outcomes have been suggested for the evaluation of
psychological interventions, not all of which are psychologically assessed.
For example, primary outcome measurement of anxiety and depression may
be early results of psychological treatments that may be expected to be
observable as soon as therapy has ended. In contrast to these proximal
results, quality of life and use of resources may be later changes which
cannot be measured for some time after therapy has discontinued or will only
become apparent following specific levels of changes in other factors such as
subjective assessments of fatigue or cognitive changes.
164. CBT encompasses a variety of different therapeutic techniques. The general
principle of CBT techniques begin with the engagement of the person in a
shared goal and after a number of sessions the identification of a model of the
development and maintenance of the problem which will include
psychological, biological and social variables. The next part of therapy is to
help the person identify any possible barriers to the attainment of a goal. The
technique is essentially the same when CBT is used in health psychology to
improve outcomes for people with physical illness as it is in the treatment of
specific psychiatric disorders.
165. The recent systematic review (Whiting et al.) concluded that CBT and GET
therapies were effective. Treatments that lasted a longer time (more than 20
weeks) seemed to have been more successful than those providing brief
therapy. There is some concern about drop out from treatment and this needs
to be investigated in more detail in new trials.
166. Many of the intervention studies using CBT and GET for CFS have been
focussed on the effects of therapy on people who have attended outpatient
clinics. This is likely to be a subset of the people who have a diagnosis of
CFS and will miss both the more severe cases as well as the least severe and
least chronic. Further research should concentrate on the effects of these
interventions across the spectrum of the disorder. Larger scale trials would
also allow the intervention to be assessed in a targeted way, to allow
consideration of possible factors that may affect the outcome of therapy e.g.
significant cognitive difficulties in attention and concentration. It may also be
useful to consider specific biological outcomes such as functional brain
imaging in parallel.
167. Other Interventions
168. There are many pharmacological, behavioural or complementary therapy
interventions that have been proposed for CFS/ME, but for which the
evidence of efficacy is lacking (Whiting et al., 2001; Mulrow et al., 2001), and
in some cases there is no underpinning theoretical scientific rationale. The
MRC CFS/ME Research Advisory Group considers that, in the absence of
knowledge of causation or pathogenesis it can still be appropriate to explore
potential interventions. However, any such study must apply the same
methodological rigour as more conventional therapies.
169. HEALTH SERVICES RESEARCH
170. Health Services Research (HSR) is used both to help guide evaluative
research into the cost-effectiveness of management strategies and to
evaluate the cost-effectiveness of ways of organising and delivering effective
care. The former research combines descriptive HSR and Health Care
Needs Assessment, and the latter Health Technology Assessment and
Service Delivery Organisation research.
171. One difficulty in identifying priorities for HSR in CFS/ME at the current time is
that basic information on the epidemiology of CFS/ME and clinically effective
treatments is lacking. For example it is not known which groups, or subgroups,
of patients might benefit from any particular treatment and hence
health care needs assessments would be premature. The rigorous evaluation
of service delivery models cannot be undertaken until it is clear what services
should be delivered. However, once fundamental research into the definition,
diagnosis, epidemiology, outcomes, and effective management strategies for
CFS/ME begin to clarify the evidence, then HSR will become increasingly
important.
172. Health Care Needs Assessment
173. Descriptive population-based studies are needed to quantify the incidence
and prevalence of CFS/ME in terms of characteristics which identify groups of
patients that could benefit from different types of management. For example,
age (particularly distinguishing children and adults), gender, and duration,
severity and nature of symptoms might all affect management options. This
research could be combined with epidemiological research into factors
associated with the incidence of CFS/ME. In either case the key
methodological issue is the need for population-based studies.
174. Descriptive Health Services Research
175. Descriptive health services research should allow greater understanding of
the services that are in place at present to deliver care. As with other chronic
illnesses, there are important issues concerning how these services are
distributed and accessed. Furthermore, it will be important to understand
whether access to these services is equal or does it reflect frequently
observed patterns of socio-economic inequality. Variations in patterns of care
and service provision can often be helpful in identifying areas of need for
evaluative research since they suggest uncertainty around best practice.
176. Health Technology Assessment
177. Health Technology Assessment considers the effectiveness, appropriateness
and cost of health “technologies”, which can be any method used by those
working in the health services to promote health, prevent and treat disease
and improve rehabilitation and long term care. As well as studies of clinical
effectiveness, it is important that the success of management options for
CFS/ME are evaluated in practical, real-world settings and that a broad range
of consequences are understood. These consequences include acceptability,
costs, effects on carers and families, and training, education and workload for
health service professionals. As well as being pragmatic it is important that
such evaluative research should investigate any variation in costeffectiveness
between sub-groups of patients for which different management
strategies might have different effects. The MRC CFS/ME Research Advisory
Group considers that such studies should utilise pragmatic randomised
controlled trial methodology if possible.
178. Service Delivery and Organisation
179. Current evidence suggests that CFS/ME patients receive care from a wide
variety of different services based in different settings, and from health care
professionals with different training. The issue of service provision was not
considered by the MRC CFS/ME Research Advisory Group. Service delivery
and organisation research is concerned with understanding which service
model is most cost-effective from the perspective of patients, their families
and carers, the Health Services, and others. Key questions surround the
training and education that doctors and nurses should receive in the care of
CFS/ME, and how services staffed by appropriately trained professionals
should be organised, and accessed. It would be particularly important to
understand whether management of CFS/ME should be part of general
services, or should be provided in specialist centres by appropriately trained
specialists, and if the latter how should these specialist centres themselves be
organised, administered, and located.
180. Appropriately designed trials of these ‘complex interventions’ should include
research from the patient perspective around issues of acceptability and accessibility.
181. RESEARCH CAPACITY AND THE INTERFACE WITH SERVICES
182. Researchers, funders and service providers need to consider how best to
achieve strategic, integrated research alliances both to sustain excellence
and to develop new areas of enquiry, and to ensure the availability of
sufficient and appropriately skilled manpower at the research-service
interface.
183. Strengthening Research Capacity
184. There may be a need for specific measures to promote multidisciplinary
collaboration around shared strategic goals, including allied health
professionals. Such collaboration offers established centres of excellence the
kind of new scientific opportunities that are essential if they are to sustain their
competitiveness internationally. In relation to emerging or currently
fragmented national effort, such collaboration can provide access to crucial
partners and expertise. The MRC CFS/ME Research Advisory Group is
conscious of the need to attract high quality researchers, from both basic
scientific and clinical disciplines, to undertake research in CFS/ME.
185. Large-scale prospective epidemiological and genetic studies would require
high quality, trained and motivated clinical and basic science researchers to
be based in a number of UK centres that combine service and research.
186. Nurturing the Research – Service Interface
187. The links between research and services need to be strong in order to recruit
and gain access to participants. Consequently, much research needs to work
through service providers. In this respect, the National Health Service
provides the UK with significant opportunities. As discussed above, the most
severely affected often experience difficulties in accessing services, and
particular efforts should be made to include this patient group.
188. THE VALUE OF LAY PARTICIPATION
189. The participation of affected individuals and their carers, researchers with
experience of patient support, and advocacy groups has enriched the process
of developing a research strategy for CFS/ME. However, the above
stakeholders have indicated that there are also broader issues, which,
although outside the terms of reference of this research strategy, are
important and to which research could make a significant contribution.
190. Further partnerships are likely to be of benefit by providing researchers and
funders with access to user perspectives, and lay organisations with access
to scientific expertise. Specifically, aspects of patient and carer experience
can help scientists better frame their research questions and to work towards
outcomes that are more relevant to the intended beneficiaries.
191. In principle, there are important two-way benefits in the active involvement of
consumers in the research process. In the case of the development of a
CFS/ME research strategy, there has already been a high level of
involvement and a range of diverse views expressed, particularly at the
strategic level. This diversity does present some difficulties as it will not be
possible to achieve the approval of all concerned.
192. Consumers can participate in research at the strategic level by being involved
in setting the research agenda, and also during the research process within a
particular study.
193. Research agenda
194. Consumers have been closely involved in the development of this research
strategy, both by major inputs at the start of the process, and also during the
deliberations of the group. Representatives of the MRC Consumer Liaison
Group are members of the MRC CFS/ME Research Advisory Group and have
met with consumers groups to access their views. In addition, a survey of
priorities for research was undertaken and independently analysed by the
NHS Public Health Resource Unit (Annex 2). Consumers have also involved
in the consultation about a preliminary draft of this document (Annex 3). –
delete from consultation document.
195. Within specific research studies
196. Consumers have the potential to be involved at every stage of the research
process, and there have been studies exploring the extent and perceived
effects of such involvement. By being involved at the earliest stages,
consumers of research can play important roles in the design of a study and
can ensure that multiple perspectives are taken into account. Consumers can
then often liaise with broader groups with which they are associated to ensure
that the perspectives can include a wider constituency. This liaison can also
be beneficial in publicising the studies so that a wider group can be aware of
the issues around participating in, for example, a clinical trial. By being
involved in a research project, consumers can also have an important role in
interpreting the study findings and ensuring that these are widely
disseminated (and implemented) throughout the relevant constituencies. This
involvement could feed back into considering what further research might be
needed.
197. The MRC CFS/ME Research Advisory Group believes that patient
organisations and support groups can play an important role in involving
participants in research. The severely ill, who sometimes experience
difficulties in accessing care, have not been adequately represented in
research studies. Patient organisations who represent and are in contact with
severely ill people with CFS/ME should work in partnership with researchers
to identify potential participants, including alerting their constituents to current
projects.
198. CONCLUSIONS AND RECOMMENDATIONS
199. The MRC CFS/ME Research Advisory Group fully endorses the conclusions
of the Report of the CMO’s Independent Working Group, namely that CFS/ME
is a real, serious and debilitating condition, and that research into all aspects of
CFS/ME is needed.
200. In considering ways to advance research on CFS/ME, the Group has focused
on a number of strategic themes: case definition, an epidemiological
framework, pathophysiology, interventions, health service research, research
capacity and the value of lay participation.
201. The MRC CFS/ME Research Advisory Group has not provided a detailed plan
for the science, nor set out an agenda of the many research projects that
might merit support. A strategy is proposed which reflects the current state of
knowledge in CFS/ME, and which aims to provide a rational framework for
advancing the understanding of the illness and to reduce suffering.
202. The MRC CFS/ME Research Advisory Group considers there should be an
agreed standardised case definition and a classification of severity and any
other relevant characteristics that define subgroups. A definition of a clinically
important improvement in disease status, with a classification of the degree of
improvement, is essential for natural history and intervention studies. Thus
the validation of a range of outcome measures, and associated changes, is a
key step.
203. Much of the basic research on the causes and aetiology of CFS/ME will be
long term in nature. New and important findings will emerge, from the current
UK and international research effort, and these too should inform longer term
research and funding strategies.
204. It is essential that the researcher–funder-lay partnership is nurtured, to ensure
that the best evidence is easily available to all, and to facilitate the growth of
consumer involvement in the design, conduct and dissemination of research -
as a means to enhancing its quality, relevance, and credibility.
205. In the short term, the MRC CFS/ME Research Advisory Group consider that
the research community should be encouraged to develop high quality
research proposals for funding that address key issues for CFS/ME research
that are amenable for study at the present time:
! case-definition;
! understanding symptomology; and
! new approaches to management.
206. In view of the probable multiplicity of causal factors and the widely disparate
findings so far reported, the MRC CFS/ME Research Advisory Group
considers that studies investigating potential causal pathways and
mechanisms, whilst having merit, would not have the same immediate impact
on increasing understanding of CFS/ME, nor reducing the suffering of
patients.
207. The MRC CFS/ME Research Advisory Group recommends that research
studies should aim to be as inclusive as possible in terms of the recruitment of
participants, and due consideration should be given to sample size to allow
for possible subgroup effects. There should be clearly stated inclusion and
exclusion criteria, with detailed justification if certain types of patients are not
included, with every effort being made to include the severely ill.
208. Randomised controlled trials of adequate size, using standardised case
definitions, eligibility criteria, and baseline and outcome assessments, could
be used to evaluate one or more of the interventions which have been shown
in one or more trials to have a benefit. Smaller trials could be undertaken to
study new potential approaches to management or treatment.
Standardisation of entry criteria, case definitions and outcome measures will
allow results to be more widely generalised and compared between studies.
209. Given the present difficulties in identifying priorities for HSR in CFS/ME
outlined above, it is not clear whether it is appropriate to make HSR a priority
at this time. However, once fundamental research into the definition,
diagnosis, epidemiology, outcomes, and effective management strategies for
CFS/ME begin to clarify the evidence, then HSR will become increasingly
important.
210. The MRC CFS/ME Research Advisory Group considers that there is a key
role for patient organisations to help attract participants to research,
especially the severely ill, and to help in the dissemination of research results.
211. Findings need to be subjected to rigorous and objective scientific analysis and
published in high quality, peer reviewed journals. The Group considered it
important that research results should be disseminated to avoid unnecessary
repetition of studies and the inefficient use of resources. There may be a need
for funders and sponsors of research to investigate additional alternative
mechanisms of dissemination, preferably involving an independent peer review
mechanism to provide scientific credibility to the results.
212. SPECIFIC REFERENCES and OTHER SOURCES OF INFORMATION
213. A Framework for Development and Evaluation of RCTs for Complex
Interventions in Health Medical Research Council (2001) (www.mrc.ac.uk/pdfmrc_
cpr.pdf).
214. A Report of the CFS/ME Working Group – Report to the Chief Medical Officer
of an Independent Working Group Department of Health
(www.doh.gov.uk/cmo/cfsmereport.html).
215. Chronic fatigue syndrome: Clinical practice guidelines – 2002. Working Group
convened under the auspices of the Royal Australasian College of
Physicians. Medical Journal of Australia 176 S17-S55.
(www.mja.com.au/public/guides/cfs/cfs2.html)
216. Fukuda K., Straus S., Hickie I., Sharpe M.C. Dobbins J.G., Komaroff A.L., and
the International Chronic Fatigue Syndrome Study Group. Chronic fatigue
syndrome: a comprehensive approach to its definition and study. Ann. Inter.
Med. 121 953-959 (1994).
217. International Classification of Diseases, Tenth Revision (ICD-10) World
Health Organisation.
218. Konsman J.P., Parnet P., Dantzer R. Cytokine-induced sickness behaviour:
mechanisms and implications. Trends Neurosci 25(3):154-9 (2002)
219. Moher D., Schultz K.F. and Altman D. The CONSORT statement: revised
recommendations for improving the quality of reports of parallel-group
randomised trials. Lancet 357(9263):1191-4 (2001) (http://www.consortstatement.
org/).
220. Mulrow C.D., Ramirez G., Cornell J.E., Allsup K. Defining and managing
chronic fatigue syndrome. Evidence Report/Technology Assessment No. 42
(Prepared by the San Antonio Evidence-based Practice Center at the
University of Texas Health Sciences Center at San Antonio). AHRQ
Publication No. 02-E001. Rockville (MD): Agency for Healthcare Research
and Quality; October 2001 (www.ahrq.gov/clinic/cfs-sum.htm).
221. Nielson WR & Weir R. Biopsychosocial approaches to the treatment of
chronic pain. Clin J Pain 17(4 Suppl):S114-27 (2001)
222. Ramsay M. Myalgic encephalomyelitis and post fatigue states – the saga of
Royal Free disease. London: Gower Medical Publishing, for the ME
Association (1998).
223. Royal Colleges of Physicians, Psychiatrists and General Practitioners.
Chronic Fatigue Syndrome. Report of a Joint Working Group London (1996).
224. The U.S. Department of Health and Human Services Chronic Fatigue
Syndrome Coordinating Committee State of Science Report - "Chronic
Fatigue Syndrome - State of the Science Conference / October 23-24, 2000"
(http://www4.od.nih.gov/cfs/finalmeeting.pdf)
225. Whiting P. Bagnall AM. Sowden AJ. Cornell JE. Mulrow CD. Ramirez G.
Interventions for the treatment and management of chronic fatigue syndrome:
a systematic review. JAMA. 286(11):1360-8, 2001.
Annex 1
Membership of MRC CFS/ME Research Advisory Group
|
|
|
Affiliation |
Area of expertise |
|
Chair |
Professor Nancy Rothwell |
University of Manchester |
Neuroinflammation |
|
Members |
Jacqueline Apperley |
MRC Consumer Liaison Group |
Lay member |
|
|
Professor Philip Cowen |
University of Oxford |
Psychopharmacology |
|
|
Professor Janet Darbyshire |
MRC Clinical Trials Unit |
Clinical Trials |
|
|
Professor Diana Elbourne |
London School of Hygiene and Tropical Medicine and Institute of Education |
Epidemiology |
|
|
Sue Haselhurst |
MRC Consumer Liaison Group |
Lay member |
|
|
Professor Alan McGregor |
Guys, Kings and St Thomas's Medical School |
Immunology/ endocrinology |
|
|
Professor Jon Nicholl |
University of Sheffield |
Health Services Research |
|
|
Professor Jackie Oldham |
University of Manchester |
Muscle physiology |
|
|
Dr Chris Verity |
Addenbrooke's hospital |
Paediatric neurology |
|
|
Professor Jonathan Weber |
Imperial College School of Medicine |
Infections |
|
|
Professor Til Wykes |
Institute of Psychiatry |
Psychological Medicine |
Annex 2
Public Health Resource Unit
Summary Report on Medical Research Council CFS/ME Consultation Questionnaire
November 2002
In brief…
To be honest, there is no single area of research that could currently claim to
provide a "strong research evidence base" for understanding CFS/ME. There are
fragments of information and partial data sets, separated by large tracts of
ignorance. The gaps are usually filled by enthusiastically held hypotheses that have
yet to be evaluated or falsified. There is a wealth of unanalysed and unpublished
data held by clinicians and patients which could be seen as a research base that
could and should be tapped in, at the least, a hypothesis-generating way (charity
representative)
I regard all of these [areas for research] as of equal importance. In my view they
should all be approached in a co-ordinated manner and with equal vigour. If we
concentrate on only one or two, we are in danger of perpetuating problems of the
past. (person with).
We need to understand the patient's story and the infinitely changing pattern that
CFS/ME may adopt in any individual. As a consequence, the research teams will
need to combine the extremes of narrative medicine with good quality genetic
engineers (researcher/clinician).
Kate Saffin
Annette Hackett
Adele Wright
Table of contents
Introduction & method 38
Response rates 38
Results 38
Understandings of CFS/ME 38
Communication issues 39
Gaps in research 39
1. Defining the condition and the research agenda 39
2. Specific gaps in knowledge 40
3. The organisation & process of research 40
Important areas for research 40
Obstacles 40
Moving forward 41
In the short term (3yrs) 41
In the longer term (5yrs) 41
Conclusion 43
Appendix: Important areas for research 44
Finding the cause. 44
What it does to the body (and the person). 45
Treatment & management 45
Cure 45
Introduction & method
As part of the consultation process to inform the MRC CFS/ME research strategy
advisory group the Public Health Resource Unit (www. phru.org.uk).were asked to
analyse the consultation qustionnaire. This report is a summary of the analysis.
People with CFS/ME (both current and recovered), carers, charity representatives,
researchers, clinicians and specialists were offered the opportunity to give their views
via a postal and web based questionnaire.
Response rates
In total 187 responses were received. The majority (131, 70%) were received
electronically. The respondents are a self selected group rather than statistically
representative of any perspective or group. In addition the high rate of electronic
responses means that the majority have access to both a computer and the Internet.
It is likely that people with CFS/ME who are disadvantaged because they are
severely affected, isolated or undiagnosed may be underepresented in the
responses.
Half the respondents were people with CFS/ME (35%) or recovered (5%) from
CFS/ME or a carer (10%). A quarter were researchers (22%). Most researchers also
described themselves as clinicians. There is some overlap between categories of
perspective with a number of respondents classifying themselves as belonging to
more than one group.
Results
The broad themes that emerged were:
! Understandings of CFS/ME
! Issues in communication
! Gaps in the research
! Barriers & obstacles to improving research
! The important areas for research
! Moving forward, making a research strategy work
Understandings of CFS/ME
! There is a wide range of understandings and meanings for each of the terms. For
some, one exists but not the other; for others, one is a sub-set of the other. Some
feel there are precise criteria, for others no criterion currently in existence means
anything useful, perhaps even damaging understanding. Some feel it is a single
entity, others that there is a range of sub-groups. Overall, there is no agreement
where the boundaries between groups fall.
! There are many shades of opinion and they provide the first evidence of the
considerable tensions and frustrations that are currently shaping not only the
research, but the management and treatment of people with CFS/ME.
All of which loses sight of the fact that for people with CFS/ME “none of the
definitions match up to how it feels to have the illness (person with)
Communication issues
In this area there is a clear division between those with personal experience of the
illness and the researcher/clinicians.
People with experience of CFS/ME:
! have encountered endless disbelief, unhelpful interventions and unsupportive
health professionals.
! have little faith in the system and see little point in research.
! in particular they criticise what they see as a dominance by psychiatry of research
in the area.
The researcher/clinicians who responded are probably among the most committed
clinicians and researchers to be found and they recognise:
! that the lack of trust that has developed is a major problem
! that the lack of consensus about diagnosis and treatment hinders progress
However, some also feel:
! frustrated and under attack from patient organisations
! a reluctance to engage in an area where there are “with such powerful views from
some support groups with aggressive stance towards clinicians”
(researcher/clinician)
Gaps in research
There are three broad areas.
1. Defining the condition and the research agenda
! There appears to be no agreed starting point – in defining or agreeing
understandings.
! In particular there is a need to find a cause, to understand better the condition.
! Many see the potential physical causes as neglected in favour of psychiatric
research.
2. Specific gaps in knowledge
! Aetiology, epidemiology and prevalence.
! Physical cause including infection, especially viral.
! Presentation and management in primary care
! Physical effects and impact (with particular mention of adolescents and children)
3. The organisation & process of research
! There has been little structure or planning in research in the field
! There have been no long term studies
! Where research is happening there is little or no co-ordination between
researchers or teams.
! There has been little patient involvement, especially those who are severely
affected and very isolated.
Very little sufferer input - this is the first time in ten years that I have been
approached regarding research (person with).
Important areas for research
The identified areas spanned an enormous range from the potential biological,
biochemical, or genetic causes, to exploring the experience of people with CFS/ME
to better understanding the complex factors influencing the course of the condition.
A detailed summary of the suggestions grouped by: finding the cause, what it does to
the body and the person, treatment & management and finding a cure can be found
at the Appendix.
Obstacles
! Funding & resources - One of the commonest topics with a total of 364
references from 135 people, thus 72% of respondents mention it at least once.
Resources include funding, time and expertise.
! The low status of research in this area. Respondents perceive a lack of political
will to support work in this area, ‘limited interest from serious academic
researchers’. They feel it is difficult to get work on physical causes accepted and
published.
! Some feel that young researchers are discouraged, other areas such as cancer
and heart disease are ‘more appealing’ politically.
! As a condition it is complex and affects people in a wide range of ways that span
existing service boundaries. No one service ‘claims’ it.
! There seems to be general agreement that not enough is known about who has
CFS/ME, where they are, what their experiences/symptoms/needs are. There is
no baseline.
! Recruitment & exclusions. There is concern that criteria for inclusion in studies
are not uniform so comparison is difficult. The current diagnostic criteria of
symptoms for more than six months means that a potentially valuable group are
never included in studies (if the cause is an infection or virus it is unlikely that
there will be any trace of it by six months later). Finally those who are severely
affected and housebound may be excluded because they do not attend outpatient
departments.
! The dominance of psychiatric research. This was primarily a concern of those
with CFS/ME but not exclusively. Some go as far as to say that they consider that
psychology and psychiatry have no place in the research strategy at all:
…we refuse to accept the validity of any research funded by or carried out by
psychiatrists who have no place researching this disease other than to mitigate the
distress it causes (whilst in fact they do the opposite). Any attempt to produce
strategies based on information provided by psychiatrists will be met by heavy
resistance from the "severely affected" patient community. (person with 081302)
Whilst this is understandable given their experiences, it is in conflict with the view that
this condition needs and deserves a comprehensive research programme.
! The boundaries - between clinicians, between clinician and researcher, between
researchers and between patients and health professionals.
! The lack of suitable tools eg measures of fatigue, with criticism about the validity
of existing ones. People with CFS/ME point out that their level of energy/fatigue
change markedly over a day or days and that current snapshot measures are
inadequate.
Moving forward
In the short term (3yrs)
! Implement the CMO report recommendations and create a programme of good
quality, comprehensive research.
! Improved management and symptom control
! Agree definitions
In the longer term (5yrs)
Most people with CFS/ME would like to see a cure within five years. However, there
is also a sense of realism that the search will continue.
The key issues raised were:
! Resources - getting funding and directing it in the right way.
! Commitment to the strategy and process from everyone involved. The notion of
commitment is expressed as listening, belief in, trust, and for one researcher –
“dissolving artificial boundaries”.
! More co-operation and collaboration - involving everyone with an interest: from
people with experience of the condition (including those who are severely ill),
through the clinicians, and other providers of care and treatment (including
complementary therapists) to researchers and the academic scientists whose
focus is cell biology or genetics.
Get the politics out of this illness. An open-minded approach firstly, especially
amongst the medical and scientific community A commitment to funding. Talking to
patients and their caregivers at all times. Involving the charities active in this field
(researcher/ person recovered/clinician)
! The process needs to be led and many call on the MRC to provide strong
leadership, including the facilitation of better collaboration. One researcher raised
the issue of job insecurity, that few researchers have a contract beyond their
current project and need constantly to be seeking funding.
! Most would like to see a managing body of some sort co-ordinating and
disseminating findings. However, there are some tensions in who should provide
this co-ordination Some suggested this might be a specialised centre or an
academic department with others saying that it should be led by organisations
representing people with CFS/ME. This body (however organised) would create
national and international networks, co-ordinate research and disseminate
findings. One respondent suggested a centre for research that would include
facilities for the severely ill to be included as in-patients so that they could take
part in studies/trials.
! The calls for a good baseline survey and review are repeated throughout this
section.
! ‘Keep an open mind’ is said by a number of respondents – although said mostly
by people with CFS/ME of clinicians it is an essential activity by everyone
involved if the strategy is to progress.
! Getting the priorities right. For many this means a shift to biological, biomedical
research
! An open debate and opportunities to negotiate meanings & definitions as well as
challenge the contradictions that currently exist.
! Finally, whilst not strictly speaking the remit of this strategy development process,
many raised the importance of education, not just in terms of improving
diagnosis, treatment and management but in raising awareness and recruiting
future researchers.
Conclusion
Overall, many with CFS/ME feel unheard and many researchers feel under attack.
Many see the development of a strategy as an opportunity to improve communication
and make a real difference to the lives of those with CFS/ME
A number commented that the consultation exercise was a positive one and that it
was the first time anyone had asked them for their views.
I don't know anything about research strategies, but I know that one is vitally
important because so little is known about the illness (person with)
PHRU
November 2002
Appendix: Important areas for research
One respondent with CFS/ME made a succinct list that provides a framework from
the point of view of the person with CFS/ME rather than the clinician.
1) Finding the cause of the illness.
2) What it does to the body.
3) Medication and treatment.
4) A cure please
Finding the cause.
The identified areas spanned an enormous range from the biological, biochemical,
genetic, to exploring the experience of people with CFS/ME to better understand the
complex factors influencing the course of the condition.
Approach Examples
Cell biology Cell biology, cell metabolism, chemical abnormalities
Genetics Genetic association studies with carefully defined phenotype,
Incidence in closed communities and families, genetic predisposition,
molecular pathogenesis of CFS/ME in immune
cells,
Environmental
factors/influences
Impact of everyday additives, toxins and chemicals,
organophosphates, stress, mercury used in dental treatment,
vaccines, food or chemical sensitivities, toxins from metals,
diet, mineral deficiencies, Virology/infection Is there a viral
cause? Infections e.g. herpes/cocksackie, a family of infective
agents yet to be identified (as H Pylori), serology, Cytokine
regulation and fatigue following viral infection,
Epidemiology Looking at common factors, why some people develop it
following infections, the complexity of the conditions, long-term
studies to follow up populations with CFS/ME, demographic
patterns, identifying sub-groups, large scale surveys, defining
the boundaries of CFS, prevalence studies,
Diagnosis Criteria, triggers, include those with early symptoms, use of
imaging, reliable tests,
Other Similarities to Gulf War syndrome or other medically
unexplained syndromes – chronic pain, irritable bowel syndrome.
Narrative patient histories (esp. re the changing nature of the condition
day to day), illness career, illness beliefs, how do sufferers talk
about their condition? How is it constructed by sufferers and by
‘experts’ and to what effect?
Definition Unpack the wide and insensitive construct CDC-1994 CFS,
defining outcome measures, aetiology,
What it does to the body (and the person).
The following are presented broadly by body system as that was the predominant
framework used by respondents. However, throughout the responses there was also
an emphasis on the need to look across systems and traditional boundaries.
Area Examples
Central Nervous system Brain function & abnormalities, sleep disorders, myelin sheath
degradation, endocrine, Cortisol levels, musculo-skeletal What happens in muscles of
person with CFS/ME, recovery from fatigue/exercise, study over time, Gastro-intestinal
Liver function, immune Fatigue Why some relapse after minimal exertion, Circulatory
Blood volume, Red blood cell shape, mitochondria, red blood cell damage, orthostatic
intolerance, elevation of nitric oxide, Other Hyperventilation, magnetic fields and low
frequency radio, why do women often improve during pregnancy?, child/adult
differences, impact of other/underlying conditions, Social impact On claiming benefits,
workplace pressures, the cost of social & healthcare, Psychological/emotional Assessment
of psychiatric co-morbidity in primary care (most so far has been in specialist centres),
links between cognitive & behaviour and physiological mechanisms, Interfaces Between
neurology and biological psychiatry, between mentalphysical symptoms, neuro-endocrine
changes
Treatment & management
Approach Examples
Management Identifying the techniques/interventions that have helped, include
severe sufferers who cannot access trials and research easily, symptom control,
communication between doctor & patient, attitudes of health professionals,
Learning from others Replication of fruitful studies in other countries,
Treatment interventions
Trials comparing graded exercise to PACING, alternative & complementary therapies,
multi-centre trial of GET, intervention studies on fatigue with healthy populations,
rehabilitation, Measurement and Monitoring Pain scales,
Cure
There are, understandably, many requests for a cure but the suggestions as to how
to achieve it are covered by the previous sections. There is also recognition
throughout the responses that this is a complex condition and it is unlikely that there
is a single cause with a single cure.