Safety and Tolerability of Fb-PMT in Recurrent Glioblastoma

This trial is evaluating a new treatment called Fb-PMT (a photodynamic therapy agent) for patients with glioblastoma — a severe brain tumor — whose cancer has come back after initial treatment. The study focuses on safety and tolerability of this approach. **You may be eligible if...** - You have been diagnosed with glioblastoma confirmed by biopsy - Your tumor has come back for the first or second time (first or second recurrence) - You have completed and recovered from standard prior treatment - You are on a stable or decreasing dose of steroids - You have had a recent MRI scan **You may NOT be eligible if...** - You are on increasing doses of steroids indicating rapid disease worsening - You have uncontrolled seizures - You have serious organ dysfunction (kidney, liver) - You are pregnant or breastfeeding Talk to your doctor to see if this trial is right for you.