Exposure to chemical in Roundup increases risk for cancer: study

UW study: Exposure to chemical in Roundup increases risk for cancer
Timeline that shows the growth in glyphosate usage worldwide (left) and key human epidemiological studies on the herbicide (right). Credit: University of Washington

Exposure to glyphosate—the world's most widely used, broad-spectrum herbicide and the primary ingredient in the weedkiller Roundup—increases the risk of some cancers by more than 40 percent, according to new research from the University of Washington.

Various reviews and international assessments have come to different conclusions about whether glyphosate leads to cancer in humans.

The research team conducted an updated —a comprehensive review of existing literature—and focused on the most highly exposed groups in each study. They found that the link between glyphosate and Non-Hodgkin Lymphoma is stronger than previously reported.

Their findings were published this month in the online journal Mutation Research/Reviews in Mutation Research.

"Our analysis focused on providing the best possible answer to the question of whether or not glyphosate is carcinogenic," said senior author Lianne Sheppard, a professor in the UW departments of Environmental & Occupational Health Sciences and Biostatistics. "As a result of this research, I am even more convinced that it is."

By examining published between 2001 and 2018, the team determined that exposure to glyphosate may increase the risk of Non-Hodgkin Lymphoma by as much as 41 percent. The authors focused their on epidemiological research in humans but also considered the evidence from laboratory animals.

"This research provides the most up-to-date analysis of glyphosate and its link with Non-Hodgkin Lymphoma, incorporating a 2018 study of more than 54,000 people who work as licensed pesticide applicators," said co-author Rachel Shaffer, a UW doctoral student in the Department of Environmental & Occupational Health Sciences.

"These findings are aligned with a prior assessment from the International Agency for Research on Cancer, which classified glyphosate as a 'probable human carcinogen' in 2015," Shaffer said.

Glyphosate first was introduced as an herbicide in 1974. Usage in the has soared, particularly since the mid-2000s when the practice of "green burndown" was introduced, in which glyphosate-based herbicides are applied to crops shortly before harvest. As a consequence, crops are now likely to have higher residues of .

Researchers say more studies are needed to account for the effects of increased exposures from green burndown, which may not be fully captured in the existing studies reviewed in this new publication.


Explore further

Stop worrying and trust the evidence: it's very unlikely Roundup causes cancer

More information: Luoping Zhang et al, Exposure to Glyphosate-Based Herbicides and Risk for Non-Hodgkin Lymphoma: A Meta-Analysis and Supporting Evidence, Mutation Research/Reviews in Mutation Research (2019). DOI: 10.1016/j.mrrev.2019.02.001
Citation: Exposure to chemical in Roundup increases risk for cancer: study (2019, February 14) retrieved 26 May 2019 from https://medicalxpress.com/news/2019-02-exposure-chemical-roundup-cancer.html
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Feb 14, 2019
Meta-analyses are always suspect.
They are not actual scientific studies but are rather an analysis of multiple actual studies and perhaps other meta-analyses someone else conducted and are prone to reflect the bias of the analysts.

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