From a self-sampling scientist to the downfall of a leading stem cell scientist, here’s our naughty list.

It includes more than 18,000 papers and conference materials that have been retracted since the 1970s.

The ex-Wayne State University scientist has racked up 33 retractions to date. 

Nine of the most recent retractions from AACR journals are for papers coauthored by embattled cancer researcher Bharat Aggarwal.

H. Gilbert Welch, a health policy expert who has advocated against superfluous cancer screening, published another Dartmouth researcher’s work, according to the university administration.

The authors of a preprint recommend that journals implement better image screening procedures before publishing articles.

Robert Ryan was forced to resign from the University of Dundee in 2016 following an investigation of misconduct.

Ching-Shih Chen’s research involved anticancer therapeutics that were being tested in clinical trials.

Alfredo Fusco, a once prominent cancer researcher, has been under investigation for alleged research misconduct since 2012.