The active ingredient in a drug used to treat acute leukemia. It is used in combination with other drugs to treat Hodgkin disease, non-Hodgkin lymphoma, rhabdomyosarcoma, neuroblastoma, and Wilms tumor. Vincristine is also being studied in the treatment of other types of cancer. It blocks cell growth by stopping cell division. It is a type of vinca alkaloid and a type of antimitotic agent. or A synthetic derivative of vinblastine, a naturally occurring vinca alkaloid. Vindesine binds to and stabilizes tubulin, thereby interrupting tubulin polymerization and preventing the formation of the mitotic spindle and cell division; treated cells are unable to undergo mitosis and are arrested in metaphase. This agent also disrupts macromolecular synthesis.