MLN8237 inhibits aurora kinase A (AurA) preventing mitotic spindle formation and proper completion of mitosis. MLN8237 exhibits anticancer chemotherapeutic activity and is currently in clinical trials as a potential treatment for multiple myeloma, non-Hodgkin’s lymphoma, and chronic lymphocytic leukemia (CLL). In bladder cancer cells, MLN8237 induces cell cycle arrest, aneuploidy, and apoptosis; in animal models of bladder cancer, this compound inhibits tumor growth. Additionally, MLN8237 inhibits tumor growth of neuroblastomas in vivo as well. In HUVECs, MLN8237 decreases tubule formation and inhibits VEGF secretion, suggesting potential anti-angiogenic activity.