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Paper Abstract

Phase I/II trial of repeated super-selective intra-arterial cerebral infusion of Bevacizumab (Avastin) for treatment of relapsed/refractory Glioblastoma Multiforme and Anaplastic Astrocytoma.

Summary

“The high-grade malignant brain tumors, glioblastoma multiforme (GBM) and anaplastic astrocytoma (AA) comprise the majority of all primary brain tumors in adults. This group of tumors also exhibits the most aggressive behavior, resulting in median overall survival durations of only 9-12 months for GBM, and 3-4 years for AA. Initial therapy consists of either surgical resection, external beam radiation, or both. All patients experience a recurrence after first-line therapy, so improvements in both first-line and salvage therapy are critical to enhancing the quality of life and prolonging survival. It is unknown if currently used intravenous (IV) therapies even cross the blood-brain barrier (BBB). The investigators have shown in a previous phase I trial that a single Super-selective Intraarterial Cerebral Infusion (SIACI) of Bevacizumab (up to 15mg/kg) is safe and effective in the treatment of recurrent GBM. Therefore, this phase I/II clinical research trial is an extension of that trial in that the investigators seek to test the hypothesis that repeated dosing of intraarterial Bevacizumab is safe and effective in the treatment of recurrent malignant glioma. By achieving the aims of this study the investigators will also determine if IV therapy with Bevacizumab should be combined with repeated selected intraarterial Bevacizumab to improve progression-free and overall survival. The investigators expect that this project will provide important information regarding the utility of repeated SIACI Bevacizumab therapy for malignant glioma, and may alter the way these drugs are delivered to the patients in the near future.”

Description

The current standard of care for recurring GBM is for patients to receive Bevacizumab (Avastin) intravenously (IV) at 10mg/kg every two weeks until their tumor grows more than 25%. At that point, these patients have deemed treatment failures and are given another treatment. Because of the blood-brain barrier (BBB) where IV drugs do not penetrate the blood vessel walls well to get into the brain, no one knows for sure if these IV drugs actually get into the brain after infusion. We have recently completed a Phase I clinical trial that has shown that SIACI of Bevacizumab is safe and effective up to a dose of 15mg/kg in patients with recurrent malignant glioma. This two-arm open-label, the non-randomized trial is a follow-up study to that trial and will ask two simple questions: Is it safe to deliver repeated doses of Bevacizumab intraarterially using these super selective intraarterial delivery techniques? Is it necessary to combine this IA regimen of treatment with biweekly IV Bevacizumab in order to improve progression-free survival (PFS) and overall survival (OS)? Information from this trial will yield important answers to the durability and efficacy of this delivery technique and may radically change the way chemotherapy is given to our patients with brain tumors.

The current standard of care:

Day 0: Intravenous Bevacizumab (10mg/kg) Day 14, 28 (and every two weeks thereafter): Intravenous Bevacizumab

Therefore the experimental aspects of this treatment plan will include:

  1. Subjects will first be treated with Mannitol prior to chemotherapy infusion (Mannitol 20%; 12.5 mL/s over 2 minutes) in order to disrupt the blood-brain barrier. This technique has been used in several thousand patients in previous studies for the IA delivery of chemotherapy for malignant glioma. We have used this without complication in the 30 patients from our Phase I protocol as well.

  2. To treat patients with one of two arms with repeated intraarterial delivery (SIACI) of Bevacizumab for patients with recurring or relapsing high-grade glioma. Each arm gets IA delivery with one arm getting IV Bevacizumab biweekly as well and the other arm not getting intervening IV therapy. In each arm, IA therapy is repeated when MRI shows progression. Persistent progression after three intraarterial chemotherapies would remove the patient from the trial.

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