MK-3475 in Combination With MRI-guided Laser Ablation in Recurrent Malignant Gliomas

Patients currently on pembrolizumab beyond the 2 year/35 cycle limit at the time of the approval of Amendment 13 (approved 07/28/2021) may continue to receive pembrolizumab unless there is progression, toxicity or agreement by the patient and PI to come off therapy. Participants who discontinue pembrolizumab after receiving 35 doses are eligible for retreatment with pembrolizumab if they progress during follow-up provided they meet the requirements. Participants may receive an additional 17 cycles (12 months) of pembrolizumab during the Second Course Phase (Retreatment).

MLA is a minimally invasive laser surgery, which employs a small incision in the scalp and skull, through which a thin laser probe is inserted and guided by MR imaging to the core of the tumor mass where it delivers hyperthermic ablation from the core to the rim.