Evidence of sex-hormone disruption in exposed men and women was unclear. Since its introduction in 1945, 2,4-D has been widely used to control weeds in agriculture, forestry, and urban and residential settings. Some industrial chemicals Monograph Working Group Members M Kogevinas (Spain)--Meeting Chair; M L Larramendy (Argentina); B W Stewart (Australia); T Sanderson (Canada); P Guénel (France); P Cocco (Italy); S Fukushima (Japan); ME Cebrian Garcia unable to attend; L T Lopez Carrillo (Mexico); R Vermeulen (Netherlands); S Naidoo (South Africa); T Prapamontol (Thailand); F L Martin unable to attend; L Rushton (UK); M Alavanja; M Bosland; R S Chhabra; W Chiu; A De Roos; R Herbert; M La Merrill; D M Reif; D Roy; M T Smith; K Thomas; M Wolff (USA) Invited Specialists None Representatives S Cazenave and C Queiroz Moreira, for the Brazilian Health Surveillance Agency (ANVISA), Brazil; M-O Rambourg, for the French Agency for Food, Environment and Occupational Health and Safety, France; and D M Winn, for the National Cancer Institute, USA Observers (non-voting) J S Bus, J E Goodman, and S A McMaster, for the Industry Task Force II on 2,4-D Research Data IARC/WHO Secretariat L Benbrahim-Tallaa; V Bouvard; R Brown; F El Ghissassi; Y Grosse; N Guha; K Z Guyton; M Korenjak; M Leon; D Loomis; H Mattock; K Straif; J Zavadil For the Preamble to the IARC Monographs see http://monographs.iarc.fr/ENG/Preamble/index.php For declarations of interests see http://monographs.iarc.fr/ENG/Meetings/index.php Of the working group members, LR received an honorarium and travel expenses for providing advice on future epidemiological research to a Scientific Advisory Group on Epidemiology of the European Crop Protection Association and MTS has received payment for consulting and testimony from US law firms and research support from the US Council for Education and Research on Toxics.