二乙基亚硝胺诱发大鼠肝癌的病理形态学研究

使用DEN诱发大鼠肝癌,整个诱癌过程分为非特异性药物反应、非癌性增生性改变和肝癌发生3个阶段。非癌性增生性改变表现为由各种异常肝细胞组成的增生结节和小胆管腺瘤样增生,从实验过程和形态学看,增生性改变与癌肿发生具有密切关系。依分化程度,肝癌的超微结构呈多样性改变。在1例胆管细胞癌中发现与APUDoma所见不能区别的致密核心颗粒,推测为1种特殊类型的胆管细胞癌。作者认为,DEN诱发的肝癌具有肝细胞和胆管细胞两种组织起源。

Pathomorphological Study on DEN-induced Hepatic Carcinomas in Rats

Hepatic carcinomas were induced with the administration of diethyl-nitrosamine (DEN) in rats. The morphological changes of the liver tissues in the course of carcinogenesis could be divided into 3 successive stages: the nonspecific changes reacting to the drug toxicity, non-cancerous hyperplastic nodules of hepatocytes and ductular cystadenomatous lesions,and the lesions of genuine malignancy including hepatocellular carcinoma and cholangiocarcinoma.The ultrastructural alterations of hepatocellular carcinoma showed a complicate picture and were related to the differentiation of the tumor cells. In one case of cholangiocarcinoma, numerous cytoplasmic dense-core granules similar to the neurosecretary granules seen in apudoma were found in some of the tumor cells, which is postulated to be a special type of cholangiocarcinoma. On the basis of the results, Ihe histogenesis of the neoplasms after DEN administration is considered to originate from hyperplastic nodules of hepatic cells and ductular hyperplasia.