Histologically diagnosed types of primary lung cancer included adenocarcinoma (27/32, 84.3% for EGFR wild type vs. 28/29, 96.6% for EGFR mutation) and small cell (5/32, 15.7% for EGFR wild type vs. 1/29, 3.4% for EGFR mutation, p = 0.26). Here, EGFR is linked to adenocarcinoma.