A Pilot Study Examining Selinexor’s Ability to Overcome Resistance in Multiple Myeloma Patients Who Are Refractory to Lenalidomide-containing Therapy Click for Study A Pilot Study Examining Selinexor’s Ability to Overcome Resistance in Multiple Myeloma Patients Who Are Refractory to Lenalidomide-containing Therapy Sponsor: Karyopharm Protocol Number: IST-321 Start Date: Not IRB approved yet Not active