Chemotherapy is a type of cancer treatment that uses chemotherapeutic drugs to destroy the tumor cells. A doctor who specializes in treating cancer with medication, called a medical oncologist. The chemotherapy which is used before surgery or radiation to shrink a tumor is known as neoadjuvant chemotherapy and after surgery or radiation to kill any remaining cancer cell is known as adjuvant chemotherapy. In intravenous chemotherapy, chemotherapeutic agents are given directly into vein to reach the tumor cells. Oral chemotherapy is usually taken in the form of a pill or capsule. Chemotherapeutic drugs are injected into an artery to treat the cancer is called intra-arterial chemotherapy (IA chemotherapy).  Topical Chemotherapy is a cream or lotion applied directly to treat the skin cancer. When chemotherapeutic agents travel through the bloodstream to reach cells throughout the body, it is called systemic chemotherapy. When chemotherapeutic drugs are directed to a specific area of the body, it is called regional chemotherapy. These treatment cures many types of cancer effectively, but also cause different side effects.