New U.S. Research Finds Evidence Linking Monsanto Weedkiller to Cancer

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    from 21st Century Wire:

    Carey Gillam at The New Lede writes…

    New research by top US government scientists has found that people exposed to the widely used weed killing chemical glyphosate have biomarkers in their urine linked to the development of cancer and other diseases.

    The study, published last week in the Journal of the National Cancer Institute, measured glyphosate levels in the urine of farmers and other study participants and determined that the presence of high levels of the pesticide were associated with signs of a reaction in the body called oxidative stress, a condition that causes damage to DNA. Oxidative stress is considered by health experts as a key characteristic of carcinogens.

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    The authors of the paper – 10 scientists with the National Institutes of Health and two from the Centers for Disease Control and Prevention (CDC) – concluded that their study “contributes to the weight of evidence supporting an association between glyphosate exposure and oxidative stress in humans.” They also noted that “accumulating evidence supports the role of oxidative stress in the pathogenesis of hematologic cancers,” such as lymphoma, myeloma and leukemia.

    “Oxidative stress is not something you want to have,” said Linda Birnbaum, a toxicologist and former director of the National Institute for Environmental Health Sciences. “This study increases our understanding that glyphosate has the potential to cause cancer.”

    The study findings come after the CDC reported last year that more than 80% of urine samples drawn from children and adults contained glyphosate. The CDC reported that out of 2,310 urine samples taken from a group of Americans intended to be representative of the US population, 1,885 were laced with detectable traces of glyphosate.

    Glyphosate is the most heavily applied herbicide in history, both in the US and globally. One of the best-known glyphosate-based products is Monsanto’s Roundup weedkiller. Roundup has been used by farmers as well as consumers for more than 40 years. Officials with Monsanto and its German owner Bayer AG have always assured the public and regulators that exposure to the weed killer does not pose a threat to human health.

    Bayer said the new NIH study has many “significant methodological limitations that affects its reliability,” and said the results conflict with other government research.

    “The increased oxidative stress found in the study could have been caused by any number of non-glyphosate related factors or a combination of them, and the study does not support the conclusion that glyphosate is the cause,” Bayer said in a statement.

    People are exposed to glyphosate by using products made with the chemical and also by eating food and drinking water contaminated with the pesticide. Scientists have found glyphosate residues in an array of popular foods and in waterways across the US.

    Notably, in the new paper, the NIH and CDC scientists said that while their study focused on farmers who were exposed to glyphosate when they sprayed it on fields, they saw similar results in “non-farmers.”

    The findings suggest “these effects may apply more broadly to the general population who are primarily exposed through ingestion of contaminated food and water or residential applications,” the study authors wrote.

    The study is so significant that it warrants regulatory attention, said some independent scientists.

    “This is a top level team of investigators and a highly credible study to which regulators need to pay attention,” said Phil Landrigan, a pediatrician and epidemiologist who worked for years at the CDC and the Environmental Protection Agency (EPA) and now directs the Program for Global Public Health and the Common Good at Boston College.

    Michael Antoniou, a scientist with the department of medical and molecular genetics at King’s College in London who has been researching glyphosate for years, said the results were “worrying,” with “major health implications.”

    Critical timing

    The new government-funded study comes at a time when both the EPA and European regulators are completing updated assessments of glyphosate safety, and as health advocates are pushing for limits on use of the chemical or requirements that products such as Roundup be labeled with a cancer warning.

    A European Food Safety Authority (EFSA) spokesperson said the agency was aware of the study and would consider whether or not the findings add “new evidence” as the agency completes its new glyphosate assessment. EFSA’s conclusions are due in July.

    The EPA also said it was looking over the new study and would “carefully review” the findings as it finalizes its assessment.

    “EPA takes very seriously our duty to protect human health and the environment,” the agency said in a statement.

    The study also comes as Monsanto and Bayer remain mired in litigation brought by tens of thousands of cancer patients who claim exposure to Roundup caused them to develop non-Hodgkin lymphoma. The company has already agreed to pay out more than $11 billion to settle the bulk of the claims – without admitting any liability – but many cases have not settled and civil trials are continuing.

    Bayer is also facing a surge in investor unrest and calls for a break-up and the ouster of top leaders after the company lost 40% of its market value following its 2018 acquisition of Monsanto.

    Bayer maintains that glyphosate does not cause cancer and that products made with it can be used safety. The company states on its website that EPA and other regulatory reviews provide an “extensive body of research” that back the company’s safety pledge.

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