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As many as 37% of breast cancer cases may be attributable to exposure to the bovine leukemia virus. The incidence of breast cancer continues to increase worldwide. In the United States, this amounted to a 40% increase in the incidence by the turn of the century....

Billion-dollar drugs have been pulled from the market for less carcinogenic contamination than is found in a single serving of grilled chicken. In 2018, one of the bestselling blood pressure drugs, valsartan—sold as Diovan—was found to be contaminated by the “probably...