IARC monographs on the evaluation of carcinogenic risks to humans volume 86 cobalt in hard metals and cobalt sulfate gallium arsenide indium phosphide and vanadium pentoxide : this publication represents the views and expert opinions of an IARC Working Group on the Evaluation of Carcinogenic Risks to Humans which met in Lyon 7 14 October 2003 Metallic cobalt particles (with or without tungsten carbide) Introduction to the monographs on gallium arsenide and indium phosphide. Studies of cancer in humans Gallium arsenide Indium phosphide Vanadium pentoxide