1. Age The younger you are, the worse your prognosis is. Pregnancy and breastfeeding Breast cancer that occurs during this period has a poor prognosis. Tumor size In the absence of lymph node metastasis, tumor diameter less than 2 cm has a better prognosis. Tumor site In the absence of lymph node metastasis, tumors located in the lateral and central regions of the breast have a better prognosis than those in the inner part of the breast. 5. Regional lymph nodes The 10-year survival rate of patients without lymph node metastasis is 75-90%, while the survival rate of patients with lymph node metastasis is only about 30%. The prognosis is also related to the absolute number of lymph nodes involved, generally 3-4 lymph nodes metastasis in axillary lymph node is the boundary, less than this number has better prognosis, more than this number has worse prognosis. The prognosis of intraductal carcinoma and mucinous carcinoma is better, while the prognosis of extensive lobular and infiltrative carcinoma is worse, and medullary carcinoma and tubular carcinoma are in between. Well-differentiated tumors have better prognosis than poorly differentiated ones, and the 5-year survival rate of carcinoma in situ can reach 100%. The prognosis of estrogen receptor and progesterone receptor is best if both are positive, and worst if both are negative, and in between if either is positive. 8. The proliferation status of tumor cells has a strong mitotic ability and poor prognosis when proliferation is fast, and a good prognosis when proliferation is slow.