Discusses the work of researchers Jim Brophy and Margaret Keith who have studied the links between cancer risk and occupation in the automovie plastics industry in Sarnia, Ontario. Much of the material used in this article is drawn from the chapter entitled “Plastics Industry Workers and Breast Cancer Risk: Are We Heeding the Warnings?” in the book Consuming Chemicals: Law, Science and Policy for Women's Health, edited by D.N. Scott and written by Brophy, Keith, and fellow researchers Robert DeMatteo, Michael Gilbertson, Andrew Watterson and Matthias Beck.