Carcinoma in situ with infiltration is serious. Compared with carcinoma in situ of breast, infiltration is serious. Bad lifestyle, heredity, radiation, hormone and so on can induce carcinoma in situ of breast, but the disease is mainly confined to the epithelial cells above the basement membrane, which does not break through the basement membrane and thus does not have the growth of downward infiltration, and does not appear in the area of lymph nodes and distant metastasis. Breast carcinoma in situ with infiltration may have local and distant metastasis. In the early stage of the tumor, there is no proliferation and metastasis, then through surgical resection, breast carcinoma in situ with infiltration belongs to the cancers with high cure rate, and most of them have to be treated in the middle stage of the cancer with surgery as the main comprehensive treatment. It is recommended to go to the hospital and receive treatment according to the doctor’s prescription.