Polychlorinated Biphenyls - analysis, History, 20th Century, Quebec, Male, Neoplasms - veterinary, Digestive System Diseases - chemically induced, Animals, Neoplasms - chemically induced, Water Pollutants, Chemical - toxicity, Polychlorinated Biphenyls - toxicity, Water Pollution, Chemical - history, Digestive System Diseases - veterinary, Female, DNA Damage...