user: What are the treatments for Breast Cancer ?

assistant: Key Points
                    - Treatment options for pregnant women depend on the stage of the disease and the age of the unborn baby.     - Three types of standard treatment are used:         - Surgery      - Radiation therapy      - Chemotherapy         - Ending the pregnancy does not seem to improve the mothers chance of survival.    - Treatment for breast cancer may cause side effects.
                
                
                    Treatment options for pregnant women depend on the stage of the disease and the age of the unborn baby.
                    
                
                
                    Three types of standard treatment are used:
                    Surgery     Most pregnant women with breast cancer have surgery to remove the breast. Some of the  lymph nodes under the arm may be removed and checked under a microscope for signs of cancer.    Types of surgery to remove the cancer include:            -  Modified radical mastectomy: Surgery to remove the whole breast that has cancer, many of the lymph nodes under the arm, the lining over the chest muscles, and sometimes, part of the chest wall muscles. This type of surgery is most common in pregnant women.     -  Breast-conserving surgery: Surgery to remove the cancer and some normal tissue around it, but not the breast itself. Part of the chest wall lining may also be removed if the cancer is near it. This type of surgery may also be called lumpectomy, partial mastectomy, segmental mastectomy, quadrantectomy, or breast-sparing surgery.           Even if the doctor removes all of the cancer that can be seen at the time of surgery, the patient may be given radiation therapy or chemotherapy after surgery to try to kill any cancer cells that may be left. For pregnant women with early-stage breast cancer, radiation therapy and hormone therapy are given after the baby is born. Treatment given after surgery, to lower the risk that the cancer will come back, is called adjuvant therapy.       Radiation therapy     Radiation therapy is a cancer treatment that uses high-energy x-rays or other types of radiation to kill cancer cells or keep them from growing. There are two types of radiation therapy:            -  External radiation therapy uses a machine outside the body to send radiation toward the cancer.     -  Internal radiation therapy uses a radioactive substance sealed in needles, seeds, wires, or catheters that are placed directly into or near the cancer.           The way the radiation therapy is given depends on the type and stage of the cancer being treated.    External radiation therapy is not given to pregnant women with early stage (stage I or II) breast cancer because it can harm the unborn baby. For women with late stage (stage III or IV) breast cancer, radiation therapy is not given during the first 3 months of pregnancy and is delayed until after the baby is born, if possible.       Chemotherapy     Chemotherapy is a cancer treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping the cells from dividing. When chemotherapy is taken by mouth or injected into a vein or muscle, the drugs enter the bloodstream and can reach cancer cells throughout the body (systemic chemotherapy). When chemotherapy is placed directly into the cerebrospinal fluid, an organ, or a body cavity such as the abdomen, the drugs mainly affect cancer cells in those areas (regional chemotherapy). The way the chemotherapy is given depends on the type and stage of the cancer being treated.    Chemotherapy is usually not given during the first 3 months of pregnancy. Chemotherapy given after this time does not usually harm the unborn baby but may cause early labor and low birth weight.    See Drugs Approved for Breast Cancer for more information.
                
                
                    Ending the pregnancy does not seem to improve the mothers chance of survival.
                    Because ending the pregnancy is not likely to improve the mothers chance of survival, it is not usually a treatment option.
                
                
                    Treatment for breast cancer may cause side effects.
                    For information about side effects caused by treatment for cancer, see our Side Effects page.
                
		        
		            Treatment Options by Stage
		            
		                
		                    Early Stage Breast Cancer (Stage I and Stage II)
		                    Treatment of early-stage breast cancer (stage I and stage II) may include the following:          -  Modified radical mastectomy.    -  Breast-conserving surgery followed by radiation therapy. In pregnant women, radiation therapy is delayed until after the baby is born.    - Modified radical mastectomy or breast-conserving surgery during pregnancy followed by chemotherapy after the first 3 months of pregnancy.
		                
		                
		                    Late Stage Breast Cancer (Stage III and Stage IV)
		                    Treatment of late-stage breast cancer (stage III and stage IV) may include the following:         -  Radiation therapy.    -  Chemotherapy.        Radiation therapy and chemotherapy should not be given during the first 3 months of pregnancy.