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  • Title: Tumor-promoting activity of cigarette tar in rat skin exposed to irradiation.
    Author: McGregor JF.
    Journal: J Natl Cancer Inst; 1976 Feb; 56(2):429-30. PubMed ID: 1255774.
    Abstract:
    A threefold increase (P=0.006) in the number of skin tumors induced by beta irradiation was demonstrated in rats after surface applications of cigarette tar. The effect appeared due to a tumor-promoting activity of the cigarette tar rather than to an additive tumorigenic effect of the two agents.
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