The IARC reached its decision based on the view of 17 experts from 11 countries, who met in Lyon, France, to assess the carcinogenicity of 5 organophosphate pesticides.
This will be of special concern to Monsanto, the company that brought glyphosate to market under the trade name Roundup in the 1970s. Over 80% of GM crops worldwide are engineered to be grown with glyphosate which has an estimated annual sales of $6 billion. The IARC has no regulatory role and its decisions do not automatically lead to bans or restrictions, but campaigners are expected to use them to put pressure on regulators. Europe is set to re-approve glyphosate this year.
The IARC assessment is available at this link