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Chemotherapy is a common treatment for cancer that uses drugs to destroy cancer cells. It worksby targeting rapidly dividing cells in the body, which includes cancer cells. Chemotherapy drugscan be administered in a variety of ways, including intravenously, orally, or through injections.Chemotherapy can be used to treat many types of cancer, including leukemia, lymphoma, breastcancer, lung cancer, and many others. It can be used in combination with other treatments, suchas surgery or radiation therapy, or it may be used as the primary treatment for certain types ofcancer. Chemotherapy drugs work by targeting the DNA or RNA of cancer cells, which preventsthem from dividing and growing.