MicroRNA arrays (miScript miRNA PCR Array Human Cancer Pathway Finder, Qiagen®) that contained 84 human miRNA probes were performed from thirteen lung adenocarcinoma, including five EGFR exon 19 mutation patients, five EGFR exon 21 mutation ones, three wild type ones, and one normal control lung tissue. The gene discussed is EGFR; the disease is cancer.