Monsanto's Roundup Herbicide Study Retracted Over Ethical Concerns
A landmark scientific study on the safety of Monsanto's Roundup herbicide has been formally retracted by the journal Regulatory Toxicology and Pharmacology, citing "serious ethical concerns" over the independence and accountability of its authors. The 2000 study, titled Safety Evaluation and Risk Assessment of the Herbicide Roundup and Its Active Ingredient, Glyphosate, for Humans, had become a key defense for Monsanto's claim that glyphosate-based weed killers do not cause cancer.
The retraction comes after internal company documents revealed Monsanto's influence on the paper. Emails obtained from the company showed how officials celebrated the publication of the study and praised the work of several Monsanto employees as part of a strategy called "Freedom to Operate" (FTO). One email described the publication of the study as "due to the perseverance, hard work and dedication of the following group of folks," listing seven Monsanto employees.
The journal's editor in chief, Martin van den Berg, stated that concerns were raised regarding authorship, validity of research findings, misrepresentation of contributions by authors and sponsors, and potential conflicts of interest. The paper's conclusions on glyphosate's carcinogenicity were based solely on unpublished studies from Monsanto, ignoring other outside, published research.
The retraction has significant implications for regulatory agencies around the world that have cited the study as evidence of the safety of glyphosate herbicides. Bayer AG, which acquired Monsanto in 2018, stated that the vast majority of published studies on glyphosate had no involvement with the company and that the consensus among regulatory bodies is that glyphosate can be used safely.
However, experts argue that the retraction is long overdue and highlights the need for greater transparency and accountability in scientific research. "The Williams, Kroes, and Munro study was the quintessential example of how companies like Monsanto could fundamentally undermine the peer-review process through ghostwriting, cherrypicking unpublished studies, and biased interpretations," said Brent Wisner, a lead lawyer in the Roundup litigation.
The retraction also raises questions about the Trump administration's bid to curtail thousands of lawsuits claiming Roundup causes cancer. The solicitor general filed a brief with the US Supreme Court arguing that federal law preempts state-law claims, but plaintiffs have argued they developed non-Hodgkin's lymphoma and other forms of cancer due to using Roundup and other glyphosate-based herbicides sold by the company.
As the EPA continues its updated human health risk assessment for glyphosate, which is expected to be released in 2026, experts hope that this retraction will serve as a wake-up call for journals and regulatory agencies to protect the impartiality of science.
A landmark scientific study on the safety of Monsanto's Roundup herbicide has been formally retracted by the journal Regulatory Toxicology and Pharmacology, citing "serious ethical concerns" over the independence and accountability of its authors. The 2000 study, titled Safety Evaluation and Risk Assessment of the Herbicide Roundup and Its Active Ingredient, Glyphosate, for Humans, had become a key defense for Monsanto's claim that glyphosate-based weed killers do not cause cancer.
The retraction comes after internal company documents revealed Monsanto's influence on the paper. Emails obtained from the company showed how officials celebrated the publication of the study and praised the work of several Monsanto employees as part of a strategy called "Freedom to Operate" (FTO). One email described the publication of the study as "due to the perseverance, hard work and dedication of the following group of folks," listing seven Monsanto employees.
The journal's editor in chief, Martin van den Berg, stated that concerns were raised regarding authorship, validity of research findings, misrepresentation of contributions by authors and sponsors, and potential conflicts of interest. The paper's conclusions on glyphosate's carcinogenicity were based solely on unpublished studies from Monsanto, ignoring other outside, published research.
The retraction has significant implications for regulatory agencies around the world that have cited the study as evidence of the safety of glyphosate herbicides. Bayer AG, which acquired Monsanto in 2018, stated that the vast majority of published studies on glyphosate had no involvement with the company and that the consensus among regulatory bodies is that glyphosate can be used safely.
However, experts argue that the retraction is long overdue and highlights the need for greater transparency and accountability in scientific research. "The Williams, Kroes, and Munro study was the quintessential example of how companies like Monsanto could fundamentally undermine the peer-review process through ghostwriting, cherrypicking unpublished studies, and biased interpretations," said Brent Wisner, a lead lawyer in the Roundup litigation.
The retraction also raises questions about the Trump administration's bid to curtail thousands of lawsuits claiming Roundup causes cancer. The solicitor general filed a brief with the US Supreme Court arguing that federal law preempts state-law claims, but plaintiffs have argued they developed non-Hodgkin's lymphoma and other forms of cancer due to using Roundup and other glyphosate-based herbicides sold by the company.
As the EPA continues its updated human health risk assessment for glyphosate, which is expected to be released in 2026, experts hope that this retraction will serve as a wake-up call for journals and regulatory agencies to protect the impartiality of science.