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Background: The pattern of lymph node metastasis in operable non-small cell lung cancer(NSCLC)has been studied for decades but controversies still exist.Whats more,the extent of lymphadenectomy in resectable NSCLC is controversial.The purpose of this study is to figure out the lymph node metastasis pattern in operable NSCLC,with the purpose to guide lymphadenectomy during surgery.