Treatment options for male breast cancer depend greatly on how far the cancer has spread, and its possible treatments include surgery, radiation and chemotherapy. If the cancer is confined to the breast and has not spread, a complete cure may be achieved through radical surgical excision. If the cancer has spread to other parts of the body, a complete cure may not be possible, but aggressive treatment can help relieve symptoms and control the progression of the cancer. Chemotherapy: Chemotherapy is a type of treatment that uses chemotherapy drugs to kill cancer cells. In male breast cancer, chemotherapy can be used to prevent the cancer from returning after surgery, slow the spread of the cancer and relieve symptoms. The routine course of treatment is divided into six sessions, each spaced several weeks apart, and is administered primarily through a vein, with each session usually lasting several hours. Side effects: Chemotherapy may cause some side effects, most of which will be relieved if chemotherapy is stopped. Side effects of chemotherapy such as: 1. fatigue; 2. weakness; 3. hair loss; 4. decreased immunity and susceptibility to infection; 5. loss of appetite; 6. diarrhea; 7. infertility, etc. Trastuzumab (Herceptin): Trastuzumab is a drug that blocks human epidermal growth factor receptor 2 (HER2), which in some male breast cancers helps cancer cells grow, so blocking HER2 can prevent cancer recurrence. It is usually used after radiation or chemotherapy and is injected directly into a vein as a liquid, or as a subcutaneous injection. Side effects such as: chills, fever, swelling of the face and lips, headache, hot flashes, nausea, wheezing and difficulty breathing, fatigue and difficulty sleeping, diarrhea or constipation, increased risk of infection, loss of appetite and weight loss, muscle, joint, chest or abdominal pain, heart problems, etc.