The biggest damage of cancer as a malignant tumor should be metastasis. The earliest lump of the tumor, we call it the primary focus. Some of the tumor cells metastasize to a new environment through blood vessels and lymphatic vessels, and settle in the new environment, which is called metastasis. Different tumors have their favorite metastatic sites. For breast cancer, bones, lungs, liver, and brain are the easy locations for metastasis. There are several stages of breast cancer, and the general criteria for classification are the size of the tumor and the presence of lymphatic or vascular metastases. If only a small lump is found in the breast, the chance of survival is very high, but as the tumor itself grows larger and metastases develop, the condition will become worse and worse. So in a slightly more general way, cancer is not scary as long as it is detected early, but it is the middle and late stage cancer that is scary. If there is no breast cancer occurring in itself, having the breast removed can basically determine that you will not develop breast cancer. Oncologists have said, “Women with hereditary breast cancer have a higher risk of developing cancer than the general population, and while prophylactic removal of the breast can reduce the risk of cancer, the removal procedure itself can bring complications and have psychological effects.” When breast cancer has already occurred, it is not just a matter of removing the breast; if the patient herself already has multiple metastases in the body, the surgery itself is of little significance; it is impossible to remove all the lesions, and it can cause major damage to the patient’s physique and reduce the patient’s quality of life. Due to the limitations of imaging, not all metastases can be detected; they may be hidden, lurking quietly in one of your organs. Doctors look at your CT films, MRI films including messy various tests and feel that they are not found. But that doesn’t mean the metastases don’t exist. It grows again unknowingly when you go home from the hospital and think you are living a normal life.