An automated audit of citation integrity across 2.5 million biomedical papers uncovers a rising signature of references that cite studies which do not exist — spreading through the peer-reviewed literature at more than twelve times the rate of three years ago.
The quarterly rate per 10,000 papers indexed in PubMed Central rose from approximately four in 2023 to 56.9 in early 2026, a more than twelvefold increase, with no precedent in the recorded history of citation error.
Every reference in the corpus was verified against four independent databases. The funnel below traces how 125.6M references narrowed to 4,046 confirmed fabrications.
Fabricated citations are engineered to look indistinguishable from real ones: real-sounding authors, plausible journals, credible dates. The pair below are real citations from our audit — one a verified, indexed publication, the other a fabrication identified in the published Lancet supplementary appendix. Select the one you believe is fabricated, then reveal the verdict.
Both citations read as equally professional. Only automated verification across FOUR INDEPENDENT DATABASES can reliably tell them apart. This fabrication pattern — plausible title attached to a real PMID that resolves to an unrelated paper in the same journal and year — is the dominant signature in our dataset.
A 2025 paper on ureteroileal anastomotic techniques in an open access oncology journal contained 18 (60%) fabricated references of 30 verified. Each fabricated reference was tailored to the paper's narrow surgical topic, attributed to real urologists, and bore claimed publication years of 2023 or 2024. The claimed titles do not correspond to any publication indexed in PubMed, Google Scholar, or CrossRef — yet each carries a real PMID and DOI that resolves to a different, unrelated paper. Concentration at this level is the upper tail of what we observed across 2.5 million biomedical papers in this audit.
Citation pattern suggests systematic rather than incidental fabrication. Source paper ↗
Fabricated citations are not uniformly distributed. The highest-rate publisher produced fabrications at more than fourteen times the rate of the most selective journals in the dataset.
More than a third of all fabricated citations came from just two publishers.
The concentration is not random. It tracks editorial intensity, peer-review depth, and the economics of fast-turnaround publishing.
By 2025, one in every 458 biomedical papers contained at least one fabricated citation.
The most affected single paper had eighteen of thirty references pointing to studies that do not exist.
Many affected papers contain three or more fabricated citations — evidence of systematic, not incidental, fabrication.
fabricated citations have entered the biomedical literature since you opened this page.
The literature does not correct itself.