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    Background:Despite numerous previous studies, the consideration of tumor location as a prognostic factor in resectable non–small cell lung cancer (NSCLC) remains controversial. The present study analyzed the association between tumor location and clinical outcome in patients with resectable NSCLC who had undergone lobectomy with systematic lymphadenectomy and who had presented with varying nodal statuses.
    Methods:The data from a cohort of 627 eligible patients treated in Sun Yat?sen University Cancer Center between January 2000 and December 2008 were retrospectively collected, and the nodal statuses of patients with different tumor locations were compared. Cox proportional hazards regression model was used to determine the independent factors related to cancer?speciifc survival (CSS).
    Results:Multivariate analysis demonstrated that left lower lobe (LLL) tumors [hazard ratio (HR): 1.465, 95% conif?dence interval (CI) 1.090–1.969,P= 0.011], lymph node metastasis (HR: 2.742, 95% CI 2.145–3.507,P < 0.001), and a tumor size of >4cm (HR: 1.474, 95% CI 1.151–1.888,P= 0.002) were three independent prognosticators in patients with resectable NSCLC. However, LLL tumors were associated only with CSS in node?positive patients (HR: 1.528, 95%CI 1.015–2.301,P= 0.042), and a tumor size of >4cm was the only independent risk predictor in the node?negative subgroup (HR: 1.889, 95% CI 1.324–2.696,P < 0.001).
    Conclusions:Tumor location is related to the long?term CSS of NSCLC patients with lymph node metastasis. LLL tumors may be upstaged in node?positive patients to facilitate an optimal treatment strategy.

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