EGFR and minimally invasive lung adenocarcinoma: By histological subtype, 8 of 11 cases (72.7%) of papillary adenocarcinoma, 3 of 4 cases (75%) of BAC; bronchiolo-alveolar carcnoma expressed in, and one of 7 cases (14.3%) of acinar adenocarcinoma expressed EGFR mutation.