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Dosimetry for lung tumorigenesis induced by urethane, 4-(N-methyl-N-nitrosamino)-1-(3-pyridyl)-1-butanone (NNK), and benzo[a]pyrene (B[a]P) in A/JJmsSlc mice.

Some chemicals are known to be lung carcinogens in rodents. While many studies using two-stage models have administered medium or high doses to mice, few have tested lower doses. The dose dependence of urethane, 4-(N-methyl-N-nitrosamino)-1-(3-pyridyl)-1-butanone (NNK), and benzo[a]pyrene (B[a]P), three well-known lung carcinogens at high doses, has not been sufficiently reported in lower dose ranges. Our study evaluated the tumorigenicity of urethane, NNK, and B[a]P at 26 weeks after a single intraperitoneal administration of each compound within medium to low dose in male and/or female A/JJmsSlc (A/J) mice. Dose-dependent tumorigenesis was demonstrated histopathologically for the three compounds. These results suggested that the tumorigenicity of these chemicals is dose dependent in A/J mice, even at lower doses than previously reported.

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