U.S. and Chinese scientists who conducted a study on subjects from southeastern China reported that variations in two genes -- ABCB1 and ABCC1 -- were more likely to be found among lung cancer patients than in cancer-free individuals. The ABCB1 gene mutation was particularly linked to adenocarcinoma, a primary form of lung cancer, as well as higher cancer risk in women and people younger than 60, researchers said.

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