U.S. District Judge Vince Chhabria said evidence that the active ingredient in Roundup — glyphosate — can cause the disease seemed "rather weak." Still, the opinions of three experts linking glyphosate and non-Hodgkin's lymphoma were not "junk science" that should be excluded from a trial, the judge ruled.
The lawsuits say agrochemical giant Monsanto, which makes Roundup, long knew about the cancer risk but failed to warn people. The ruling allows the claims to move forward, though the judge warned it could be a "daunting challenge" to convince him to allow a jury to hear testimony that glyphosate was responsible for individual cancer diagnoses.
Many government regulators have rejected a link between cancer and glyphosate. Monsanto has vehemently denied such a connection, saying hundreds of studies have established that the chemical is safe.