Role of chemotherapy for survival in patients with second primary non-small cell lung cancer.

Significant findings of the study A significant therapeutic effect of chemotherapy for second primary non-small cell lung cancer was proven through univariate Cox regression and propensity score matching analysis. Prognostic factors for second primary non-small cell lung cancer patients who had received chemotherapy. What this study adds Chemotherapy could be applied in clinical practice as an additional therapeutic method for second primary non-small cell lung cancer patients. We selected prognostic factors for patients who had received chemotherapy to identify patients who were appropriate for chemotherapy.