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Combination antibody therapy shows promise in metastatic melanoma
Date:6/3/2011

BOSTON--A duo of drugs, each targeting a prime survival strategy of tumors, can be safely administered and are potentially more effective than either drug alone for advanced, inoperable melanomas, according to a phase 1 clinical trial led by Dana-Farber Cancer Institute investigators.

The findings (abstract 8511), will be presented in an oral session at the annual meeting of the American Society of Clinical Oncology on Saturday, June 4, 3 p.m. CT, Arie Crown Theater, McCormick Place.

The drugs -- ipilimumab and bevacizumab -- are both monoclonal antibodies, intensified formulations of natural disease-fighting proteins. Ipilimumab spurs the immune system to attack diseased cells, including tumor cells. Bevacizumab, also known by the trade name Avastin, blocks the growth of blood vessels that provide tumors with nourishment. Ipilimumab has extended the lives of metastatic melanoma patients in previous clinical trials, and bevacizumab is often used to treat tumors of the colon, lung, and kidney.

The trial involved 22 patients with metatastic melanoma that was not treatable by surgery.

F. Stephen Hodi, MD, the study's lead author and director of the melanoma treatment center at Dana-Farber, said the trial is the first to explore whether the two agents enhance each other's effectiveness. Most of the participants didn't experience serious adverse side effects, although some did experience inflammation of artery walls, the liver, thyroid gland, colon, or uvea (the middle layer of the eye). Five patients required steroid treatment for these problems and were removed the trial.

Positron emission tomography (PET) scans showed a prompt immune system response to many of the melanoma tumors, and computed tomography (CT) scans showed decreased blood flow to the tumors. Eight of the participants had partial responses -- showing some tumor shrinkage -- to the dual treatment, and six had stable disease. All the responses lasted at l
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Contact: Bill Schaller
william_schaller@dfci.harvard.edu
617-632-5357
Dana-Farber Cancer Institute
Source:Eurekalert

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