title: Negative test for transplacental carcinogenicity of nickel subsulfide in Fischer rats.
abstract: Transplacental carcinogenicity of nickel subsulfide (Ni3S2) was tested by im administration of Ni3S2 (20 mg) to 8 pregnant Fischer rats on day 6 of gestation. Control dams received a similar injection of the vehicle. The progeny at risk for tumor development comprised 50 offspring (17 males, 33 females) of Ni3S2-treated dams and 53 offspring (29 males, 24 females) of control dams. Body weights of progeny of Ni3S2 treated dams were lower than progeny of control dams, but sex-specific cumulative mortality rates in the two groups did not differ significantly. By age 26 months, 2 malignant and 2 benign tumors developed in progeny of Ni3S2-treated dams, versus 3 malignant and 2 benign tumors in progeny of control dams. Hence, administration of Ni3S2 to pregnant rats had no significant effect upon tumor incidence in the progeny.
mesh_terms: D000818:Animals; D002273:Carcinogens / Q000633:toxicity*; D005260:Female; D005333:Fetus / Q000187:drug effects*; D009369:Neoplasms / Q000139:chemically induced; D009532:Nickel / Q000378:metabolism / Q000633:toxicity*; D011247:Pregnancy; D051381:Rats; D013440:Sulfides / Q000378:metabolism / Q000633:toxicity
chemical_list: D002273:Carcinogens; D013440:Sulfides; D009532:Nickel; C017557:nickel subsulfide