IARC Statement
While we as WHO/IARC scientists and staff as concerned individuals are aware of the denial exercise by various industries that market such products as were evaluated in the WHO/IARC Monograph meeting on Some Organophosphate Insecticides and Herbicides: Diazinon, Glyphosate, Malathion, Parathion, and Tetrachlorvinphos (3-10 March 2015), as independent scientists, we can only reiterate that all peer-reviewed published scientific literature was indeed reviewed by the Expert Group. The outcome of this meeting was a  unanimous classification of the herbicide glyphosate and the insecticides malathion and diazinon  as probably carcinogenic to humans (Group 2A). The insecticidestetrachlorvinphos and parathion were classified as possibly carcinogenic to humans (Group 2B) - Please see the Q&A IARC posted on 20 March:  
In addition, please note that Observers from industry were present during the meeting in March. Below an extract of our Q&A published on March 20.
The established procedure for Monographs evaluations is described in the Programme’s Preamble. Evaluations are performed by panels of international experts, selected on the basis of their expertise and the absence of real or apparent conflicts of interest. For Volume 112, a Working Group of 17 experts from 11 countries met at IARC on 3–10 March 2015 to assess the carcinogenicity of tetrachlorvinphos, parathion, malathion, diazinon, and glyphosate. The in-person meeting followed nearly a year of review and preparation by the IARC secretariat and the Working Group, including a comprehensive review of the latest available scientific evidence. According to published procedures, the Working Group considered “reports that have been published or accepted for publication in the openly available scientific literature” as well as “data from governmental reports that are publicly available”. The Working Group did not consider summary tables in online supplements to published articles, which did not provide enough detail for independent assessment. 

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