Author Correction: Survival impact of treatment for chronic obstructive pulmonary disease in patients with advanced non-small-cell lung cancer.

In the Results section, under the subheading "COPD and OS in patients with advanced NSCLC", "In the multivariate Cox proportional hazard model, TKI treatment, recurrence after curative treatment and better PS were significantly associated with better OS in patients with advanced NSCLC (Table 2)." now reads: "In the multivariate Cox proportional hazard model, after adjusting for clinicopathologic variables, TKI treatment, recurrence after curative treatment and better PS were significantly associated with better OS in patients with advanced NSCLC (Table 2)." In addition, in the Results section, under the subheading "COPD treatment and OS", "The median OS in patients with COPD treatment (8.2 months) was lower than that in patients without COPD treatment (16.8 months)." now reads: "The median OS in patients without COPD treatment (8.2 months) was lower than that in patients with COPD treatment (16.8 months).". [Extracted from the article]