A type of antibiotic that is only used in cancer chemotherapy. It slows or stops the growth of cancer cells in the body. Used to treat: breast cancer, ovarian cancer, bladder cancer, lung cancer, thyroid cancer, gastric cancer, soft tissue and osteogenic sarcomas, neuroblastoma, Wilms' tumor, malignant lymphoma (Hodgkin's and non-Hodgkin's), acute myeloblastic leukemia, Ewing's tumor, squamous cell carcinomas of the head, neck, cervix, and vagina, carcinomas of the testes, prostate, and uterus, refractory multiple myeloma, and Kaposi's Sarcoma.