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American Journal of Pathology, Vol 116, 319-326, Copyright © 1984 by American Society for Investigative Pathology
REGULAR ARTICLES |
G Stoica and A Koestner
In this study, 30-day-old male Sprague-Dawley rats, were inoculated intraperitoneally with a single dose of 45, 90, and 180 mg/kg of N- ethyl-N-Nitrosourea (ENU). A wide spectrum of neoplasms occurred. The most common tumors were those of the mammary gland and of the nervous system. Although the incidence of mammary tumors was highest in the two high-dose groups (90 and 180 mg/kg ENU), the incidence of neurogenic tumors was highest in the 45 mg/kg dose group. Mammary tumor development led to early death and precluded development of tumors of the nervous system, which require a longer latency period. A variety of neoplasms of other organs have been associated particularly with high doses of ENU, including ameloblastic tumors, carcinomas of the thyroid, prostate, kidney, pancreas, intestine, and lung, hemilymphatic tumors, and sarcomas. It is concluded that large doses of ENU are capable of expanding the tumor spectrum in young male rats beyond the target organs generally affected with lower doses, as described in earlier reports.
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