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Penn Researchers Create Drug To Help Target Attack On Cancerous Tumors

Philadelphia, PA -- Researchers at the University of Pennsylvania Cancer Center have developed a drug that will help doctors fine- tune cancer treatments to patients. The drug, EF5, permits doctors to effectively determine the oxygen content of a tumor-- which subsequently dictates the appropriate course of treatment to be followed.

Cancer clinicians have long known that hypoxic tumors--which thrive in oxygen-starved environments--are much more resistant to radiation and chemotherapy than their non-hypoxic cousins. But until now, physicians have had difficulty assessing hypoxicity

"When we know which tumors are hypoxic, we'll be able to custom-tailor a patient's cancer treatment," says Gillies McKenna, MD, Chair of Radiation Oncology at the University of Pennsylvania Cancer Center. "This may mean prescribing a more aggressive form of therapy, such as modifying the way radiation is delivered, or giving radiation in combination with drugs designed to exploit the hypoxic nature of the tumor," says McKenna.

EF5, developed by Cameron J. Koch, PhD, Professor of Radiation Oncology, was recently approved by the FDA for a Phase I clinical trial at the University of Pennsylvania Medical Center.

Patients with early stage cervix tumors, located at the neck of the uterus, and soft tissue sarcomas, are given EF5 intravenously two days before their tumors are surgically removed or biopsied. During this time, EF5 attaches or "binds" to hypoxic tumor cells, but "washes out" of tumor regions that are oxygen-rich. A small portion of the tumor, removed at surgery, is then exposed to fluorescent monoclonal antibodies.* These antibodies fasten to the hypoxic regions in the tumor and highlight its oxygen content.

Sydney Evans, VMD, Assistant Professor of Veterinary Medicine, has spent the last several years demonstrating the safety and efficacy of EF5 in animal tumor models and says that E
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Contact: Sue Montgomery
smontgom@mail.med.upenn.edu
(215) 349-5657
University of Pennsylvania School of Medicine
24-Feb-1998


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