Karyopharm Therapeutics Inc. is a commercial-stage pharmaceutical company. The Company is engaged in the discovery, development and commercialization of drugs directed against nuclear export for the treatment of cancer and other diseases. It 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 Company 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.