Different drugs can fight different types of endocrine cancer. For example, if you have thyroid cancer, you may need chemotherapy drugs after your thyroid surgery to kill any remaining cancer cells. You will also need to take a thyroid medication called levothyroxine for the rest of your life. This replaces the hormone your thyroid would ordinarily secrete, and it blocks the pituitary gland from secreting thyroid-stimulating hormone that could prompt the cancer to regrow.
Other types of endocrine cancers require different drugs. If you have gastrointestinal carcinoid tumors, for instance, chemotherapy may not work. Your doctor may prescribe other drugs to shrink or stall the tumor's growth or to relieve your symptoms.