Word: carcinogens
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Dates: during 1960-1969
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...gives a dose of X rays to seemingly virus-free mice, they develop cancers containing virus particles. The late Dr. Francisco Duran-Reynals argued that chemicals and viruses combine to cause cancer. Now many laboratories are confirming his basic thesis: mice painted with a low dose of a known carcinogen (cancer-causing chemical) get no tumors, and neither do those exposed only to viruses; but if mice get both the virus and minute amounts of the chemical, many of them soon develop cancer...