Radiation-induced mammary tumorigenesis in pseudopregnant rats mated with vasectomized partners.


Pseudopregnancy was induced in Wistar-MS female rats by mating with male rats 1 month after vasectomy. Pseudopregnant rats received whole-body irradiation with 2.6 Gy gamma-rays at day 7 of pseudopregnancy and were then implanted with a DES pellet as a tumor promoter. In the control groups, virgin 2.5 month-old rats, and normal pregnant rats at day 7 of… (More)


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