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25 September 1987, Volume 7 Issue 3

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The Incidence of Spontaneously occurring Tumors in TR1 and TR 2 Rats

LIN Bing-Shui, DOU Gui-Rong, WANG Dong-Mao, ZHANG Yu-Ying, CUI Zhen-Huan, LUAN Shu-Zhi

1987, 7(3):  131-132. 

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The incidence of spontaneously occurring tumors in the selected TR 1 and TR 2 inbred strain rats was observed over two years and reported the results of histological examinations as follow. The TR l rats used were 288 （□105；♀ 183） Mammary gla-nd fibroadenomas in the TR 1 rats were 9.3% （♀）and 1.0% （□）,mammary gland adenocarcinomas 1.6% （♀）,lung adenomas 1.6% （♀） and 2.9% （□）. The TR 2 rats used were 336 （□186；♀150）.Mammary gland fibroadenomas were 13.3%（♀） and 2.2%（□）, mammary gland adenocarcinomas 2.7% （♀） and 0.5% （□）, lung adenomas 0.7% （♀） and hepatomas 0.3% （1/336）。