Chemotherapy
Chemotherapy is the use of anti-cancer drugs to treat cancerous cells. Chemotherapy can be administered intravenously (in the vein) or by pill, and is usually a combination of different drugs.

Chemotherapy treatments are often given in cycles; a treatment for a period of time, followed by a recovery period, then another treatment. Treatment usually lasts several months. Chemotherapy may be given in a variety of settings including your home, a hospital outpatient facility, a physician's office or clinic, or in a hospital.

Chemotherapy is often used after breast cancer surgery to help reduce the recurrence of cancer in the breast. It also can help prevent cancer from occurring in other parts of the body. When used after surgery, this is called adjuvant chemotherapy.

Chemotherapy can also be used before breast cancer surgery to reduce the size of the tumor before operating. This is called neo-adjuvant chemotherapy. 

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