The prognosis of breast cancer is influenced by many factors, such as age, menstruation, fertility, disease duration, size of primary cancer, clinical stage, treatment, histological type, local infiltration, lymph node metastasis, female hormone receptor status, DNA ploidy status of cancer cells and the expression status of some oncogenes in cancer cells, etc. Among them, the more decisive factors are the early stage of disease, whether the lymph nodes are metastatic or not and the histological type of the disease. The early stage of the disease, whether the lymph nodes are metastatic or not, and the type of histology are the most important factors. The early stage of the disease has always been an important factor in determining the prognosis, as reported both at home and abroad. Studies have shown that the earlier the stage of disease, the better the prognosis. The progression of treatment outcomes described below may help to illustrate this point. It is well known that despite repeated improvements in the treatment of breast cancer in recent decades, the 10-year survival rate after radical surgery hovered at 40-50% until the 1970s. According to the NCI, there is an unprecedented increase in the 5-year survival rate after breast cancer treatment. Although there are different factors for this occurrence, the significant increase in early stage cancers, especially in situ and microscopic cancers since the 1980s, may be an important factor. Since these early-stage cancers rarely metastasize and have a high rate of clinical control, the survival rate is improved, which fully indicates that the early stage of the disease is an important factor in determining the prognosis. Lymph node metastasis The presence or absence of lymph node metastasis has obvious influence on the prognosis, which is mainly manifested as follows: those with lymph node metastasis are mostly seen in recurrence and blood type metastasis. The pathological type of primary cancer Breast cancer has different biological characteristics and different prognosis according to different pathological types. The collection of pathological histological data of 2594 cases of radical breast cancer in 10 hospitals in China and the observation of more than 10 years of follow-up showed that the worse the differentiation of cancer tissues and the more metastases, the trend of lower survival rate, and the statistical treatment all showed obvious differences.