Conditions: GBM Glioblastoma Multiforme Gliosarcoma
Keywords: GBM Glioblastoma Multiforme Gliosarcoma
Allocation: NA | Intervention model: SINGLE_GROUP
Enrollment: 6
Healthy volunteers: no

Brief summary:
The purpose of this study is to evaluate the effectiveness of Prostate Specific Membrane Antigen (PSMA ADC), as well as its safety and side effects for patients with advanced brain tumors. This study will also study how your body metabolizes (breaks down) PSMA ADC.

Detailed description:
PSMA expression has been demonstrated in the tumor neovasculature of Glioblastoma Multiforme (GBM) by immunohistochemical staining. Strong reactivity to the antibody component of PSMA ADC was observed in the endothelial cells of new tumor blood vessels in GBM. Since the endothelial cells are located on the luminal surface of blood vessels, PSMA ADC does not need to cross the blood brain barrier to reach its target. Following binding and internalization of PSMA ADC, the cytotoxic component of PSMA ADC will be released and destroy the neovasculature that supports tumor growth. Therefore, PSMA ADC may be an active treatment for GBM.

Bevacizumab, an inhibitor of angiogenesis, has been shown to be effective in improving progression-free survival as a single agent. Thus PSMA ADC, which targets tumor angiogenesis by a mechanism different from that of bevacizumab, may be a novel therapeutic modality for GBM.

A phase 2 study of PSMA ADC is proposed for patients with GBM that have progressed after standard treatment that includes radiation, temozolomide and bevacizumab. A phase 1 study of PSMA ADC in prostate cancer is ongoing and a phase 2 dose level of 2.5 mg/kg IV every 3 weeks has been defined. Treatment after bevacizumab failure for patients with GBM is a major unmet medical need. If activity were demonstrated in this trial, a definitive randomized study would be proposed.

Arms:
arm 1: 2.5 mg/kg, IV, over 60 minutes every 3 weeks

Interventions: intervention 1: PSMA ADC
Intervention descriptions: intervention 1: 2.5 mg/kg, IV, over 60 minutes every 3 weeks

Protocol document: