Baraniuk, James N, Eaton-Fitch, Natalie, Marshall-Gradisnik, Sonya · Frontiers in immunology · 2024 · DOI
Researchers combined results from 28 previous studies to confirm that people with ME/CFS have natural killer (NK) cells—a type of immune cell that fights infections and abnormal cells—that work at about half the strength of healthy people's NK cells. This is one of the most reliable biological differences found in ME/CFS. The analysis confirms this is a real, consistent problem in the condition.
NK cell dysfunction is the most consistent immune abnormality identified in ME/CFS research, and quantifying its magnitude across multiple studies strengthens the biological basis of the condition. This meta-analysis provides reliable evidence that could guide development of immune-targeted therapies and validate NK cell assessment as a potential biomarker for ME/CFS diagnosis and disease progression.
This study does not prove that reduced NK cell function causes ME/CFS or is responsible for specific ME/CFS symptoms—it only confirms the association exists. The meta-analysis cannot establish whether NK cell dysfunction precedes disease onset, develops as a consequence of illness, or contributes to post-exertional malaise or other cardinal features. It also does not clarify whether restoring NK cell function would improve clinical outcomes.
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
Baraniuk, James N, Eaton-Fitch, Natalie, & Marshall-Gradisnik, Sonya (2024). Meta-analysis of natural killer cell cytotoxicity in myalgic encephalomyelitis/chronic fatigue syndrome.. Frontiers in immunology. https://doi.org/10.3389/fimmu.2024.1440643
BibTeX
@article{mecfsatlas-baraniuk-2024-meta-analysis,
author = {Baraniuk, James N and Eaton-Fitch, Natalie and Marshall-Gradisnik, Sonya},
title = {Meta-analysis of natural killer cell cytotoxicity in myalgic encephalomyelitis/chronic fatigue syndrome.},
journal = {Frontiers in immunology},
year = {2024},
doi = {10.3389/fimmu.2024.1440643},
note = {PubMed: 39483457},
url = {https://www.mecfsatlas.com/evidence/baraniuk-2024-meta-analysis},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-25. https://www.mecfsatlas.com/evidence/baraniuk-2024-meta-analysis
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