Factors associated with better OS were age (<60 vs ≥60, 29.9 vs 22.1; P = .048), ECOG PS (<2 vs ≥2; 28.9 vs 19.4 months; P = .001), tumor differentiation grade (27.5 vs 17.7; P = .029), and EGFR (+) mutation status (39.8 vs 20.9 months; P = .001). Here, EGFR is linked to neoplasm.