By zeroing in on aberrations in two cancer-fighting genes, researchers have found a marker of cancer risk that could help doctors screen people for signs of lung cancer early enough for treatment to be effective.
Lung cancer will kill roughly 159,000 people in the United States this year, making it the deadliest malignancy. About 85 percent of patients are diagnosed too late for surgery, and they generally survive only 6 to 15 months.
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