GBP1 and papillary adenocarcinoma: Regarding the predominant subtypes of lung adenocarcinoma, 63 patients had papillary adenocarcinoma (27 [60.0%] were GBP1-positive), 19 had solid type (12 [26.7%] were GBP1-positive), 9 had acinar type (5 [11.1%] were GBP1-positive), and 6 had micropapillary type (1 patient [2.2%] was GBP1-positive) (P = 0.22).