Journal Retracts Weed Killer Study Backed by Monsanto, Citing ‘Serious Ethical Concerns’

In 2017, a lawsuit uncovered internal emails from chemical giant Monsanto that suggested its employees helped ghostwrite an influential paper that claimed to find no evidence the company’s widely used glyphosate herbicide, Roundup, caused cancer. Now, the scientific journal that published the 2000 paper has announced it has been retracted.

The paper was withdrawn because of “serious ethical concerns” and questions about the validity of the research findings, toxicologist Martin van den Berg, co–editor-in-chief of Regulatory Toxicology and Pharmacology, wrote in a scathing retraction notice released on 28 November. “This article has been widely regarded as a hallmark paper in the discourse surrounding the carcinogenicity of glyphosate and Roundup,” wrote van den Berg, who works at Utrecht University. “However, the lack of clarity regarding which parts of the article were authored by Monsanto employees creates uncertainty about the integrity of the conclusions drawn.”

The decision, which came more than 8 years after the initial revelations, can be traced to the work of two scientists who this year filed a retraction request with the journal after documenting the staying power of the disputed paper. “My worry is that people will keep citing it,” says Naomi Oreskes, a historian of science at Harvard University who sought the retraction along with her then–postdoctoral researcher, Alexander Kaurov.