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Angiogenesis inhibitor improves brain tumor survival by reducing edema
Date:3/29/2009

clear benefits in some glioblastoma patients adds to the urgency of understanding the mechanisms that underlie these clinical improvements. We need to learn how to tailor our treatments to benefit even more patients."

The current study was designed to clarify whether cediranib's clinical effects primarily resulted from reduction of edema, which has significant consequences within the brain, or from a direct anti-tumor effect. The researchers implanted fluorescently labeled human or rat glioblastoma cells into the brains of mice and directly observed the tumors and surrounding tissue through transparent windows through the skull. Once tumors began growing, some of the mice received daily doses of cediranib, along with daily measurement of tumor growth, edema and of blood vessel structure and function.

Mice treated with cediranib were found to have significant reductions in the size and permeability of tumor-associated blood vessels, compared with animals that did not receive the drug. Although treatment did not reduce the rate of tumor growth, mice receiving cediranib lived significantly longer than the control animals. Another group of tumor-bearing mice received the steroid drug most commonly used to treat edema, and though those animals also lived longer than controls, the survival benefit was greater for the mice receiving cediranib.

"This is the first paper to show that vascular normalization alone, without chemotherapy, can be effective against some tumors by controlling edema and that this anti-edema effect is better than that of currently used steroids," Jain says. "Unfortunately, these anti-VEGF agents did not slow the tumor growth rate in these models; and since recurrent glioblastomas are highly resistant to currently used chemotherapy drugs, even if vascular normalization increases drug delivery, there may be little or no additional increase in patient survival. We urgently need to find better anti-tumor and anti-angio
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Contact: Katie Marquedant
kmarquedant@partners.org
617-726-0337
Massachusetts General Hospital
Source:Eurekalert

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