Brain
Regulatory Approval for New Cotara(R) Brain Cancer Clinical Trial
By Peregrine Pharmaceuticals, Inc
Oct 13, 2006, 01:17

Peregrine Pharmaceuticals, a biopharmaceutical company with a portfolio of innovative, clinical stage products for the treatment of cancer and hepatitis C virus infection, today announced that it has received regulatory approval in India for a new clinical trial of its lead tumor necrosis therapy (TNT) agent Cotara(R). The trial is designed to test the safety and efficacy of Cotara in patients with glioblastoma multiforme, a deadly form of brain cancer. Cotara is currently being studied in a multi-center U.S. glioblastoma trial. Previous studies using Cotara to treat brain cancer have produced encouraging results, and Peregrine expects that positive data from this trial in combination with data from the ongoing U.S. clinical trial should provide the foundation for planning the future development and commercialization of Cotara.

The new safety and efficacy study is expected to be an integral part of Peregrine's overall Cotara brain cancer development program. It will be conducted according to internationally accepted ICH GCP guidelines at up to seven clinical centers and is expected to enroll up to 40 patients with glioblastoma who have experienced their first relapse. Patients will receive a single infusion of the drug by convection-enhanced delivery (CED), an NIH-developed technique in which the drug is slowly administered directly into the glioblastoma tumor with great precision. The primary endpoints of the trial are to confirm safety and determine median survival time and median time to progression in Cotara-treated patients. Patient enrollment in the study is expected to be completed by the end of 2007.

"We believe this new clinical trial will be a cornerstone of our future plans to develop Cotara for the treatment of this deadly form of cancer," said Steven W. King, president and CEO of Peregrine. "We are moving this program forward in India because of the high level of experience of the participating neurosurgeons with CED delivery, the state-of-the-art facilities of the medical centers involved and the fact that the contract research organization overseeing the trial is highly experienced in successfully running similar glioblastoma trials with many of the investigators who will be involved with our study."

Mr. King added, "We have previously generated encouraging results using Cotara in this lethal cancer, and this study should allow us to evaluate the potential of the drug to extend patient survival more rapidly than we had originally anticipated. The new trial aims to provide clinical data in a timely manner that can be combined with the dosimetry and safety data we will be gathering from the ongoing U.S. study to guide the further clinical and commercial development of Cotara. We believe this trial could greatly expedite our Cotara brain cancer program based on the fact that some of the cancer centers we are working with routinely treat thousands of brain cancer patients each year, while major U.S. centers typically treat at most several hundred."

Global pharmaceutical companies including Pfizer, GlaxoSmithKline, Roche and Eli Lilly have been conducting an increasing number of major clinical trials in India in recent years, taking advantage of the country's world-class clinical research facilities that leverage India's large cadre of Western-trained medical personnel and enormous pool of patients eager to participate in clinical trials.

Cotara is an experimental new treatment for brain cancer that links a radioactive substance designed for medical uses -- a radioactive isotope -- to a targeted monoclonal antibody. This monoclonal antibody is designed to bind to a type of DNA that is exposed only on dead and dying cells. Solid tumors, including brain tumors, have a significant number of dead and dying cells at their center, and Cotara's targeting mechanism enables it to home in on these dying tumor cells, delivering its radioactive "payload" directly to these cells at the center of the tumor mass. Cotara thus literally destroys the tumor "from the inside out" with minimal radiation exposure to healthy tissue.

Cotara is delivered through a special method called convection-enhanced delivery (CED). CED uses a catheter to bypass the blood brain barrier and target the specific tumor site in the brain, directing Cotara to the tumor more precisely. This type of delivery has been shown to achieve up to a 10,000-fold greater concentration in local therapy exposure than conventional intravenous drug administration, while minimizing unwanted exposure.

In previous clinical studies Cotara has demonstrated encouraging results in a number of patients with advanced brain cancer. One study demonstrated a greater than 50% increase in median survival time in a group of patients suffering from late stage glioblastoma multiforme who were treated with Cotara. This was considered a promising development in this serious and deadly disease. Cotara is currently in a multi-center dosimetry and dose confirmation trial in glioblastoma patients being conducted by the New Approaches to Brain Tumor Therapy (NABTT), a consortium of leading U.S. academic brain cancer centers. Cotara has been granted orphan drug status and fast track designation by the U.S. Food and Drug Administration for the treatment of glioblastoma multiforme.

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