Study to Evaluate the Efficacy and Safety of Pemigatinib in Participants With Previously Treated Glioblastoma or Other Primary Central Nervous System Tumors Harboring Activating FGFR1-3 Alterations (FIGHT-209)

This is an open-label, monotherapy study of pemigatinib in participants with recurrent glioblatoma (GBM) or other primary CNS tumors with an activating FGFR1-3 mutation or fusion/rearrangement. This study consists of 3 cohorts, Cohorts A, B, and C, and will enroll approximately 82, 82, and 25 participants into each cohort, respectively. Participants will receive pemigatinib 13.5 mg QD on a 2-week on-therapy and 1-week off-therapy schedule as long as they are receiving benefit and have not met any criteria for study withdrawal.