1　乳腺癌癌前病变的概念　　乳腺癌是乳腺上皮细胞增生及不典型增生的基础上逐步发展而成的。一般把某些在组织形态学有一定程度异型或增生活跃 ,经随访有一部分发展成癌的乳腺增生性病变称为乳腺癌癌前病变。正确认识乳腺癌的癌前病变 ,对于早期发现、早期诊断乳腺癌和做好二 1 The concept of breast cancer precancerous lesions Breast cancer is gradually developed on the basis of mammary epithelial cell proliferation and atypical hyperplasia. Generally, certain hyperplasias of breast hyperplasia that have a certain degree of abnormal or hyperplasia in histomorphology and have been followed up are called breast cancer precancerous lesions. Correct understanding of breast cancer precancerous lesions for early detection, early diagnosis of breast cancer and good