EGFR and neoplasm: No significant difference was observed among the three groups in the distribution of histology types (p = 0.633), year of diagnosis (p = 0.816), ECOG PS (p = 0.567), sex (p = 0.882), smoking habit (p = 0.168), tumor site (p = 0.325), tumor size (p 0.595), EGFR mutation status (p = 0.297), or PORT dose (p = 0.415).