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Determining genetic signature of lung tumors can help guide treatment
Date:5/20/2008

The first U.S. clinical trial using genetic screening to identify lung tumors likely to respond to targeted therapies supports the use of those drugs as first-line treatment rather than after standard chemotherapy has failed. While the study led by Massachusetts General Hospital Cancer Center investigators found that upfront gefitinib (Iressa) treatment considerably improved the outcomes for non-small-cell-lung-cancer (NSCLC), additional research is required before such a strategy can be used for routine treatment planning. The report appears in the May 20 Journal of Clinical Oncology.

This is a pivotal clinical trial that demonstrates the power of personalized medicine in lung cancer treatment, says Lecia Sequist, MD, MPH, of the MGH Cancer Center, who led the study. It is an exciting glimpse into what we hope is the future of cancer care. Instead of a one size fits all therapy, we are moving towards finding the best treatment for each patient.

The most common form of lung cancer, NSCLC is the leading cause of cancer deaths in the U.S. Until recently, there were no treatment options for NSCLC patients in whom chemotherapy failed. Iressa, which disables the epidermal growth factor receptor (EGFR) on the surface of lung cancer cells, was approved in 2003 for treatment of NSCLC even though it shrank tumors in less than 15 percent of patients because, in those whom it did help, responses were rapid and dramatic.

In 2004 MGH Cancer Center researchers and a team from Dana-Farber Cancer Institute both discovered why Iressas success was confined to a limited group of patients. Specific EGFR mutations that were probably responsible for a tumors development also made the cancer sensitive to Iressa treatment. Subsequent to that announcement, the Laboratory for Molecular Medicine at the Harvard-Partners Center for Genetics and Genomics developed a test to screen for these sensitizing mutations.

Late in 2004 a collaborative gr
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Contact: Sue McGreevey
smcgreevey@partners.org
617-724-2764
Massachusetts General Hospital
Source:Eurekalert

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