S100A4 and squamous cell carcinoma: There were no differences in the values of S100A4 between histological subtype of NSCLC (adenocarcinoma, 8.44 ng/mL [IQR, 1.01–30.29 ng/mL]; squamous cell carcinoma, 6.25 ng/mL [IQR, 1.39–33.70 ng/mL]; other subtypes, 6.26 ng/mL [IQR, 1.75–28.81 ng/mL; P = 0.814].