Yoshitaka Fujii published 183 papers on fabricated data — the largest medical fraud

Yoshitaka Fujii, a Japanese anesthesiologist, published at least 183 papers between 1991 and 2011, primarily on postoperative nausea and vomiting. His publication rate was extraordinary — roughly one paper every five weeks for two decades. The data in his papers were almost entirely fabricated.

The fraud was exposed in 2012 when an editor at the journal Anaesthesia noticed statistical anomalies in Fujii's submissions and commissioned an investigation. Toho University, where Fujii had been affiliated, found that he had conducted almost none of the experiments described in his papers. The data were invented.

Over 180 of Fujii's papers were retracted — the largest number of retractions for a single author in medical history. The case exposed systemic failures in peer review: for 20 years, journals published his papers without questioning the implausible consistency of his results or the volume of his output. The case illustrated how the 'publish or perish' culture can create incentives for fabrication, and how peer review fails when reviewers assume the data are real.