TUESDAY MORNING: Conference Opening and Plenary Session on Neuropathology
PHOTO:
Professor Stephen Holgate, Southampton University, opened the conference with some encouraging news about the Wellcome Trust (a major funder of medical research) and Arthritis Research UK (another research funder that is interested in some of the overlaps between inflammatory arthritis and ME/CFS) joining the collaborative and making a substantial financial contribution.
Professor Holgate referred to some of the key conclusions and recommendations relating to nomenclature, definition, and the need to make ME/CFS an inclusive diagnosis that were contained in the Institute of Medicine (IoM) report. He also welcomed the sometimes critical but constructive analysis of ME/CFS research contained in the National Institutes of Health Pathways to Prevention report.
Taking this forward in the form of a ‘Grand Challenge’, Professor Holgate set out a number of research priorities which all the key stakeholders involved in research must now address:
· Agreeing on a case definition for ME/CFS
· Subgrouping (phenotyping in medical jargon) people who come under the ME/CFS umbrella in order to develop what is now referred to as personalized medicine. Professor Holgate compared the situation in ME/CFS to asthma, which used to be regarded as one homogenous disease with one basic cause and treatment. Asthma is now recognized to be a very heterogeneous condition that involves at least six different molecular and cellular pathways, with differing phenotypes responding (or not responding) to different forms of treatment (mast cell stabilization for example).
· Collecting and banking biological samples – blood, post-mortem tissue etc
· Identifying preventable and therapeutic targets for each subgroup
PHOTO:
Professor Jose Montoya, Stanford University, USA, opened the first plenary session on neuropathology with an outstanding presentation that commenced with a one minute silent tribute to his close colleague Dr Martin Lerner, who had recently died. Martin Lerner had worked with Professor Montoya on a number of research studies, including the use of antiviral treatment.
Professor Montoya also referred to the impact of the Institute of Medicine (IoM) report and is a supporter of the new IoM diagnostic definition for ME/CFS (or systemic exertion intolerance disease/SEID as is being recommended in the report) because he believes that clinicians need a simple and accurate way of making a diagnosis and one that is better than is contained in the options – eg Canadian, Fukuda – that are currently available. Work from the Stanford group indicates that there is a strong (90%) concordance between Canadian, Fukuda and IoM definitions.
He then said that people with ME/CFS had been ignored and humiliated by the very people who were supposed to be helping them – the medical profession. In his own words….“I have a wish and a dream that medical and scientific research societies in the US will apologise to their ME/CFS patients”.
Turning to treatment, Professor Montoya described how the publication of a flawed clinical trial involving acyclovir had led to the view that ME/CFS was not caused by EBV infection and that antiviral drugs do not have any role in the treatment of ME/CFS. Despite this, he has been involved in a number of the clinical trials that have assessed the efficacy and safety of the antiviral drug valganciclovir. This is a treatment option – involving a lower dose than is normally used in other situations over a prolonged period of time, at least 6 months, possibly much longer - that he now uses for some ME/CFS patients with considerable success. In addition to antiviral activity and reduction of latent HHV-6 replication, he believes that this drug may have immunomodulatory effects in ME/CFS as well (as it can decrease the level of white blood cells called monocytes and reduce microglia activation in mice).
[CS note: During the discussion that followed I pointed out that here in the UK antiviral treatment is not recommended by NICE - so antiviral drugs are seldom used in ME/CFS and very little interest has been shown in further research or clinical trials involving antiviral treatment. The MEA has met with Roche, the pharmaceutical company that makes this drug, but we did not have any success in trying to set up a UK clinical trial. We clearly need an independent randomized placebo-controlled trial to assess the value of valganciclovir in ME/CFS.
Professor Montoya then described some of the other research that his multidisciplinary group at Stanford are carrying out on a large group of ME/CFS patients, along with healthy controls, with the help of a $5 million anonymous donation. In particular:
· Immune function studies which are looking at the response to infection with various organisms and the role of immune system chemicals called cytokines, and how the cytokine pattern changes over time (less or more than 3 years – the Hornig/Lipkin study), as well as daily fluctuations in cytokines relating to activity levels. To do so they can measure over 50 individual cytokines and have access to a cohort of around 200 ME/CFS patients and 400 controls. The Stanford group intend to examine the function and role of natural killer (NK) cells. A proposed research study will also involve a detailed study of the role of NK cell status and function in ME/CFS.
· Virology studies examining the role of latent herpes viruses including EBV and HHV-6 and how low NK function may be maintaining HHV-6 activation in ME/CFS. Professor Montoya also referred to research involving Torque viruses. Torque teno virus is considered to be a relatively new global marker of immune function and the more immunosuppression occurs, the higher the level of torque viruses. Professor Montoya pointed out that torque viruses have been found to be lower in ME/CFS – adding further support to the role of immune system activation in ME/CFS.
· Neuroimaging studies looking at both grey and white matter in the brain - one of which has used diffusion tensor imaging, an MRI based technique that can visualize location, orientation and anisotropy of white matter tracts in the brain. This study has recently been published and reported a very significant structural abnormality involving the right arcuate fasciculus. This structure contains fibres, which connect different areas of the brain. The fibres are thicker in ME/CFS than in healthy controls and the inference that nerve fibre transmission is therefore affected could turn out to be a diagnostic marker for ME/CFS.
· Genetic studies examining HLA characteristics in ME/CFS and a genetic predisposition to ME/CFS
Key references:
Immunology: cytokine status and illness duration
http://www.ncbi.nlm.nih.gov/pubmed/26079000
Neuroimaging: right arcuate fascicus abnormality
http://pubs.rsna.org/doi/abs/10.1148/radiol.14141079
Valganciclovir clinical trials:
Kogelnick 2006:
http://www.ncbi.nlm.nih.gov/pubmed/17276366
Lerner et al, 2002:
http://www.ncbi.nlm.nih.gov/pubmed/12582420
Lerner et al: 2004:
http://www.ncbi.nlm.nih.gov/pubmed/12582420
Montoya et al 2013:
http://www.ncbi.nlm.nih.gov/pubmed/23959519
Watt et al, 2012
http://www.ncbi.nlm.nih.gov/pubmed/23080504
Valganciclovir reduces inflammation in HIV:
http://hivandhepatitis.com/recent/2011/0426_2011_c.html
>> All patients treated with valganciclovir had undetectable CMV viral load after 8 weeks of treatment, while 44% of those in the placebo group still had detectable CMV. In addition, valganciclovir-treated participants had significantly greater reductions in CD8 T-cell activation (defined as CD38+HLA-DR+ marker profile) compared with placebo recipients at weeks 8 and 12 -- a reduction of about 20%. Patients in the valganciclovir arm also had reduced levels of high-sensitivity C-reactive protein (CRP), a blood biomarker of inflammation.
Virology: Torque viruses:
http://jid.oxfordjournals.org/content/early/2014/05/05/infdis.jiu210.full
YouTube video of opening remarks from Professor Stephen Holgate and presentation from Professor Jose Montoya: