A drug used to treat breast cancer and choriocarcinoma (a type of gestational trophoblastic tumor) that have not gotten better with other treatment. It is also used to treat Hodgkin lymphoma, non-Hodgkin lymphoma, Kaposi sarcoma, mycosis fungoides, and testicular cancer. It is also being studied in the treatment of other types of cancer. Vinblastine sulfate blocks cell growth by stopping cell division and may kill cancer cells. It is a type of vinca alkaloid and a type of antimitotic agent. The brand name Velban has been taken off the market and is no longer available.