Fig. 2

A: Overall survival rate for all patients; the 5-year overall survival rate was 68.8%. B: The 5-year OS rate for males was significantly lower than that for females (p < 0.001). C: For the first primary tumor, patients who underwent lobectomy achieved superior survival benefits than patients who underwent sublobectomy (p < 0.001). D: For the second primary tumor, patients who underwent lobectomy or sublobectomy had similar 5-year survival rates (p = 0.671)