Lyall, Marc, Peakman, Mark, Wessely, Simon · Journal of psychosomatic research · 2003 · DOI
Researchers reviewed all the studies looking at immune system problems in ME/CFS patients to see what patterns emerged. They found that results were mixed and often contradictory—some studies showed low natural killer cells, while others didn't, especially when looking at higher-quality research. The review suggests that how studies are designed and conducted can affect whether certain immune changes are found.
This systematic review provides a critical, comprehensive evaluation of immune research in ME/CFS, helping clinicians and patients understand the current state of evidence. It highlights the importance of study methodology in interpreting immunological findings and suggests that inconsistent results may reflect research quality differences rather than true biological variation. This work establishes a baseline for understanding what is and isn't reliably known about immune dysfunction in ME/CFS.
This review does not prove that immune dysfunction doesn't exist in ME/CFS—only that available evidence hasn't consistently demonstrated a reliable pattern. The findings do not establish causation or rule out real biological abnormalities; they indicate that study design quality significantly impacts reproducibility. The review cannot determine whether methodologically-improved future studies will reveal consistent immune markers.
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 →
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