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The current state of lung cancer treatment
Date:12/11/2012

A review in the December issue of the journal Archives of Pathology & Laboratory Medicine by Paul Bunn Jr, MD, University of Colorado Cancer Center investigator and past president of ASCO, IASLC and AACI describes the current state of lung cancer care.

"We're in a new paradigm in which we realize this top cause of cancer deaths is actually a number of related diseases, each potentially with its own cause and cure," Bunn says.

The review describes the shift from blanketing lung cancer with radiation and chemotherapy, to targeting the specific genetic mutations that cause lung cancer's many varieties. The first of these oncogenic lung cancer mutations to be exploited by a drug was the epidermal growth factor receptor (EGFR), described in 2004 and targeted by the drugs erlotinib and gefitinib. Then in 2007 the oncogenic ALK/EML4 fusion protein was described, and is now targeted by the drug crizotinib, which earned FDA approval in 2011. Drugs in the development pipeline target a handful of additional lung-cancer-causing mutations including KRAS, HER2/neu, BRAF, NRAF, and ROS.

"Pathologists used to define lung cancer as one of four types, based on its appearance," Bunn says, "but it's much more heterogenous than that. Some of these driver mutations may only be present in 1 or 2 percent of the lung cancer population, and mutations in combination may make for hundreds of species of the disease, each with its own response characteristics to targeted drugs and drug combinations."

"Whole exome sequencing shows there are about 300 mutations in the average lung cancer," Bunn says. "You may have an EGFR mutation driving the cancer, but then the other 299 mutations may help define who will do well on an EGFR inhibitor."

Bunn points out that in the lung cancer varieties whose driver oncogenes can be matched with targeted therapy, we tend to see 70-80 percent patient response as opposed to 20-30 percent response to traditiona
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Contact: Garth Sundem
garth.sundem@ucdenver.edu
University of Colorado Denver
Source:Eurekalert

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