DMBA诱导大鼠乳腺癌与纤维肉瘤中cyclin D1及p53蛋白的表达及其意义

目的 探讨cyclinD1和p53蛋白在实验性大鼠同时性乳腺癌与纤维肉瘤中的表达及其意义。方法 通过改良给药的方法复制大鼠同时性乳腺癌与纤维肉瘤动物模型，应用SP免疫组化技术检测cyclinD1和p53蛋白在乳腺癌、纤维肉瘤及瘤旁组织中的表达。结果 在正常乳腺组织中无 D1和p53蛋白表达，在不典型增生乳腺组织中7／14有cyclinD1表达，8／18的乳腺癌与9／14的纤维肉瘤中有cyclin D1的表达，7／18的乳腺癌与5／14的纤维肉瘤中有p53蛋白的过度表达；肉瘤旁组织无cyclinD1和p53蛋白表达。cyclinD1和p53蛋白表达与乳腺癌和纤维肉瘤组织学分级有关，同时二者的表达呈负相关。结论 在大鼠同时性乳腺癌与纤维肉瘤中有cyclinD1和p53蛋白过度表达，cyclinD1蛋白可能参与肿瘤发生过程，而p53蛋白表达与肿瘤的恶性程度相关。

THE SIGNIFICANCE OF CYCLIN D1 AND P53 PROTEIN EXPRESSION IN BREAST CARCINOMA AND FIBROSARCOMA INDUCED BY DMBA IN RATS

Objective To investigate the significance of cyclin D1 and p53 protein expression in synchronous breast carcinoma and fibrosarcoma in rats. Methods Immunohistochemical SP methods was used to study the expression of cyclin D1 and p53 in synchronous breast carcinoma and fibrosarcoma induced by DMBA in rats.Results There was no expression of cyclin D1 and p53 in normal breast tissue. In atypical hyperplasia of mammary, there was overexpression of cyclin D1(7/14) and no expression of p53. The overexpression of cyclin D1 and p53 were detected in breast carcinoma (8/18,7/18 respectively) and fibrosarcoma (9/14,5/14 respectively). There was no expression of cyclin D1 and p53 in adjacent sarcoma.The expression of cyclin D1 and p53 protein was associated with histological grading, and showed inverse relation between them. Conclusion There are cyclin D1 and p53 protein overexpression in the synchronous breast carcinoma and fibrosarcoma induced by DMBA in rats. Cyclin D1 may paticipate in the course of the carcinogenesis of breast carcinoma and fibrosarcoma in rats, and p53 protein overexpression may relate to the degree of malignancy of the tumors.