Study Evaluating the Efficacy and Safety of Selinexor (KPT-330) in Participants With Recurrent Gliomas

This is an open-label, multicenter, Phase 2 study to evaluate the efficacy and safety of oral selinexor in participants with recurrent gliomas. Initially, the study included 2 arms: an exploratory Surgical Arm (Arm A) with sequential enrollment for participants who require surgery and a medical arm (Arm B) for participants who are not eligible for surgery. Enrollment in Arm B was stopped to explore alternative dosing in Protocol Versions ≥ 4.0 to potentially improve tolerability. Four arms (Arms C, D, E, and F) were added to the Medical Arm in Protocol Version 4.0. Arms E and F were eliminated in protocol version 6.0 and no participants were ever enrolled in these arms. Participants in the primary population enrolled under Protocol Version ≥ 4.0 will be randomized to Arm C and Arm D (approximately 30 participants per arm) to explore alternative dosing to potentially improve tolerability. After screening and registration/randomization in the study, participants enrolling in Arm A or randomized to Arm C will receive 60 mg selinexor orally twice weekly. Participants randomized to Arm D will receive 80 mg selinexor orally weekly. Participants will be treated until progression of disease or the development of unacceptable toxicities. All participants will then undergo the End of Treatment (EOT) visit.