In 2015, the World Health Organization, however, classified glyphosate as probably carcinogenic to humans.
Partridge added in his statement to NPR, "We have sympathy for anyone suffering from cancer, but the science clearly shows that glyphosate was not the cause". That case is waiting on a judge's evidentiary decision that could determine if the case will proceed.
The first case to be heard is that of a former school groundskeeper, Dewayne Johnson, of whom doctors said is already dying of non-Hodgkin's lymphoma in just a matter of years.
"[There is] absolutely no connection between glyphosate and cancer", Monsanto said in a statement.
The outcome of Johnson's case will not affect the hundreds of other lawsuits in state and federal courts, but it may serve as an indicator of how the others might go. The agency noted that scientific studies from other countries concluded the same. "It's time to hold Monsanto accountable for putting this risky product on the market", Wagstaff said. Farmers in California, the most agriculturally productive state in the USA, use it on more than 200 types of crops.
Up next, Chhabria said, individual plaintiffs will need to present "enough evidence to warrant a jury trial on whether glyphosate caused the National Hockey League [cause non-Hodgkin's lymphoma] they developed". Homeowners use it on their lawns and gardens.
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The company said its stance was backed up by more than 800 scientific studies and reviews.
Johnson claims his exposure to the weed-killing product Roundup and the chemical in it - called glyphosate - caused his illness. When a hose broke once, it soaked his entire body.
The defense says Johnson's cancer developed long before he used Roundup.
There was "at least a strong argument that the only reasonable conclusion one could draw right now is that we don't yet know" whether the herbicide is causing non-Hodgkin's lymphoma, he said.
Another federal judge presiding over hundreds of lawsuits like Johnson's is deciding whether the claim that Roundup weed killer can cause cancer is supported by good science.
George Lombardi, an attorney for Monsanto, said non-Hodgkin's lymphoma takes years to develop, so Johnson's cancer started well before he began working at the school district.