Maes, Michael, Kubera, Marta, Stoyanova, Kristina et al. · Current topics in medicinal chemistry · 2021 · DOI
This study found that ME/CFS involves measurable problems with the immune system and cellular stress rather than being primarily psychological. Researchers identified specific markers in the blood—including signs of bacterial leak from the gut, immune cell activation, and oxidative damage—that together explained about one-third of ME/CFS symptoms. Importantly, the study identified three distinct subgroups of ME/CFS patients with different immune patterns, suggesting the condition may not be the same in everyone.
This study provides objective, laboratory-based evidence supporting ME/CFS as a biological disease involving immune dysfunction and oxidative stress, potentially shifting clinical and scientific understanding away from psychosomatic explanations. The identification of distinct immune subgroups has implications for future stratified treatment approaches and personalized medicine. Recognition of ME/CFS as having measurable biological mechanisms validates patient experiences and may improve access to appropriate medical care.
This study does not establish causation or prove that these biomarkers directly cause ME/CFS symptoms—only that they are associated with them. The cross-sectional design means we cannot determine whether these immune changes precede, follow, or are consequences of the disease. The model explains only about one-third of symptom variance, indicating other important mechanisms remain unidentified.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Maes, Michael, Kubera, Marta, Stoyanova, Kristina, & Leunis, Jean-Claude (2021). The Reification of the Clinical Diagnosis of Myalgic Encephalomyelitis/ Chronic Fatigue Syndrome (ME/CFS) as an Immune and Oxidative Stress Disorder: Construction of a Data-driven Nomothethic Network and Exposure of ME/CFS Subgroups.. Current topics in medicinal chemistry. https://doi.org/10.2174/1568026621666210727170147
BibTeX
@article{mecfsatlas-maes-2021-reification-clinical,
author = {Maes, Michael and Kubera, Marta and Stoyanova, Kristina and Leunis, Jean-Claude},
title = {The Reification of the Clinical Diagnosis of Myalgic Encephalomyelitis/ Chronic Fatigue Syndrome (ME/CFS) as an Immune and Oxidative Stress Disorder: Construction of a Data-driven Nomothethic Network and Exposure of ME/CFS Subgroups.},
journal = {Current topics in medicinal chemistry},
year = {2021},
doi = {10.2174/1568026621666210727170147},
note = {PubMed: 34315375},
url = {https://www.mecfsatlas.com/evidence/maes-2021-reification-clinical},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/maes-2021-reification-clinical
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