Karyopharm Therapeutics, Inc. is a commercial-stage pharmaceutical company, which engages in the discovery, development, and commercialization of drugs directed against nuclear export for the treatment of cancer and other diseases. The company is headquartered in Newton, Massachusetts and currently employs 279 full-time employees. The company went IPO on 2013-11-06. The firm is engaged in the discovery, development and commercialization of drugs directed against nuclear export for the treatment of cancer and other diseases. The company is developing and commercializing small molecule Selective Inhibitor of Nuclear Export (SINE) compounds that inhibit the nuclear export protein exportin 1 (XPO1). Its lead asset, XPOVIO (selinexor), is marketed in combination with bortezomib and dexamethasone for the treatment of adult patients with multiple myeloma who have received at least one prior therapy. The firm is engaged in evaluating selinexor in certain hematological and solid tumor malignancies, including endometrial cancer, mycosis fungoides (MF) and diffuse large B-cell lymphoma (DLBCL). The Company’s product candidate, eltanexor, is an oral SINE compound like selinexor, that selectively blocks the nuclear export protein XPO1.