Among the 16 IDH1/2-mutated (IDH+) pts with glioma, we observed 2 complete responses (CR; 1 ongoing, duration: 111+ weeks; 1 discontinued, duration: 33 weeks), 1 unconfirmed partial response (PR), and 8 pts with stable disease (SD)….PRT811 demonstrated an acceptable safety profile and clinical activity in pts with glioma and MUM.