The cost of one chemotherapy session for breast cancer is around $4,000 to $9,000. If the breast cancer is in the early stage and a regular dose is taken, the cost of one chemotherapy session is around $4,000~5,000. If the patient is strongly positive for HER-2 and the treatment requires the use of targeted drugs, such as injectable trastuzumab, the cost of one chemotherapy session is about $7,000~9,000. Of course, the cost of chemotherapy for breast cancer is also related to the local economic level, the type of drugs used, and the medical insurance policy of each place. Breast cancer needs to strictly follow the doctor’s instructions during chemotherapy, and nausea, vomiting, diarrhea and adverse reactions caused by organ dysfunction may occur during chemotherapy.