Stemline Therapeutics, Inc. is a clinical stage biopharmaceutical company, which engages in the discovery, acquisition, development, and commercialization of novel therapeutics for oncology indications of unmet medical need. Its clinical stage product candidates include SL-401, SL-801, and SL-701. The SL-401, is a targeted therapy directed to the interleukin-3 receptor (CD123) present on a malignancies. The SL-801, is a novel oral small molecule reversible inhibitor of XPO1, that has demonstrated in vivo and in vitro preclinical activity in a solid and hematologic malignancies. The SL-701, is an immunotherapy designed to activate the immune system to attack tumors. The company was founded by Ivan Bergstein on August 8, 2003 and is headquartered in New York, NY.