There is no vaccine against breast cancer and no preventive shots exist for this disease. The most common vaccine targets currently being studied for breast cancer vaccines are HER-2, MUC-1, CEA and hTERT. There are a variety of vaccines being researched, however, the two fastest progressing phase III clinical trials of breast cancer vaccines have not yielded the results one would expect. Breast cancer is a phenomenon in which the epithelial cells of the breast proliferate out of control in response to a variety of cancer-causing factors. In the early stage of the disease, patients often show symptoms such as breast lumps, nipple overflow and enlarged lymph nodes in the armpit. In China, the incidence of breast cancer is on the rise year by year, and more than 300,000 women are diagnosed with breast cancer every year. The incidence rate of breast cancer is especially obvious in the eastern coastal areas and economically developed big cities. In terms of age of incidence, the incidence of breast cancer in China begins to rise gradually after the age of 20, and reaches a high value at the age of 45 to 50. The cause of breast cancer is still unclear, so far scientists have not found the exact cause of breast cancer, but many high-risk factors related to the development of breast cancer have been found, such as over-nutrition, obesity, high-fat diet, excessive alcohol consumption, etc. will increase the incidence of breast cancer. Women should have regular medical checkups to prevent the disease, especially when they have symptoms of chest pain, it is recommended to actively seek medical treatment.