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Glyphosate, a study guaranteeing its safety withdrawn after 25 years
Undeclared conflicts of interest, paid authors, lack of transparency: one of the most cited studies on glyphosate, published in 2000, has been retracted.
“Safety evaluation and risk assessment of the herbicide Roundup and its active ingredient, glyphosate, for humans.” is the title of a study published in 2000 in the scientific journal Regulatory Toxicology and Pharmacology. While it may mean little to most people, for countless governments, lawmakers, and industry stakeholders who have defended the herbicide glyphosate over decades, it is an extremely well-known text.
The study used to claim: glyphosate poses no health risks
Those 49 pages formed the basis of much of the reasoning used to grant and renew approvals for the commercial use of one of the most controversial agricultural chemicals ever. The analysis concluded that the use of Roundup—Monsanto’s flagship product, now owned by Bayer—posed no risk to human health.
Now, on each of those 49 pages, a huge word appears in red, uppercase letters: “RETRACTED.” The study in question is in fact suspected of having been written by individuals with clear, undeclared conflicts of interest.
Repeated citations by governments and regulators to authorise glyphosate
Over the past 25 years, the scientific article has been one of the most frequently cited studies on glyphosate, particularly by government authorities and regulatory bodies that have relied on it to regulate and authorise the herbicide’s use. Today, however, a note published by the journal’s editor lists a series of “critical” shortcomings.
These include the failure to incorporate certain studies on cancer risks linked to glyphosate exposure, as well as the lack of transparent disclosure that several Monsanto employees had contributed to drafting the paper. Nor was it revealed that the authors had been paid by Monsanto itself, the multinational later acquired by Germany’s Bayer in 2016.
Three major blows to the study’s credibility
These are three major flaws that have undermined not only the credibility of the study, but also that of its authors. Such conduct is particularly troubling given that glyphosate toxicity—listed for years by the International Agency for Research on Cancer (Iarc) as probably carcinogenic—has yet to receive a clear and definitive scientific verdict.
The journal’s publisher, Elsevier, has stated that a formal re-examination procedure of the study has been launched. For the sake of accuracy, it must therefore be noted that the outcome of this review is not yet known.
Warnings about conflicts of interest as early as 2002
It is known, however, that as early as 2002, a group of around 20 scientists sent a letter to the publisher denouncing “conflicts of interest, lack of transparency, and absence of editorial independence” with regard to the paper. One of the signatories, Lynn Goldman of George Washington University, told AFP that the study’s retraction was justified “for exactly the same reasons we raised at the time.”
Furthermore, in 2017, leaked internal Monsanto documents revealed the role played by company employees in drafting the text. For decades, however, nothing was done. This raises broader questions about the mechanisms used by the scientific community to ‘validate’ research findings.
Incredibilmente, la Monsanto da parte sua non si è mai scomposta. In passato aveva anzi dichiarato candidamente di essere a conoscenza della partecipazione diretta alla stesura del testo, ma aveva assicurato che essa “non aveva raggiunto un livello tale da dichiararne la paternità”.
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