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Clinical implications of KRAS mutational status in advanced non-small cell lung cancer (NSCLC) remain unclear. To clarify this point, we retrospectively explored whether KRAS mutations could impact tumor response, and disease control rate (DCR) to first-line platinum-based chemotherapy (CT) as well as progression-free survival (PFS) or overall survival (OS).Between June 2009 and June 2012, 340 patients...