Abstract:
:In addition to spontaneous uterine endometrial adenocarcinomas at a high incidence (35.1%), development of endometrial hyperplasia/adenoma was also frequently detected in rats of the Donryu strain. The total yield of all observed proliferative endometrial lesions was very high (60.6%). The tumors arose commonly in the uterine horn of aged rats. Histologically, most demonstrated glandular structures, consisting of cuboidal or columnar cells with weak eosinophilic or basophilic cytoplasm and large nuclei. In about half of the animals with adenocarcinomas, metastasis to remote organs such as the lung was observed. Histological examination of the ovary and vaginal epithelium revealed ovarian cysts, atrophy of the ovary and cornification of the vaginal epithelium more frequently in rats with endometrial carcinomas than in animals without tumors. These findings indicate that adenocarcinoma development in Donryu rats is associated with endocrine imbalance [increased serum estrogen: progesterone (E2:P)ratios]. By comparative investigation of strain differences, it was confirmed that irregular estrous cycles began earlier with higher incidence in Donryu rats than in F344 rats, a low-incidence strain. Histological findings of the ovary and vaginal epithelium also suggested relatively increased estrogen levels in Donryu rats compared to F344 rats. Estimated plasma values of gonad steroids showed that the E2:P ratio in Donryu rats at 12 months of age was about five times that in F344 rats. These results therefore indicate that hormone imbalance, particularly an increased E2:P ratio, may play an important role in the spontaneous occurrence of endometrial adenocarcinoma in Donryu rats.
journal_name
J Cancer Res Clin Oncoljournal_title
Journal of cancer research and clinical oncologyauthors
Nagaoka T,Onodera H,Matsushima Y,Todate A,Shibutani M,Ogasawara H,Maekawa Adoi
10.1007/BF01637084subject
Has Abstractpub_date
1990-01-01 00:00:00pages
623-8issue
6eissn
0171-5216issn
1432-1335journal_volume
116pub_type
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