EGFR and adenocarcinoma: When the data were categorized by tumor histology type, EGFR mutations were detected in 20/108 (18.5%) tumor samples and 14/112 (12.5%) plasma samples from adenocarcinoma patients and in 2/34 (5.9%) and 3/40 (7.5%) samples from non-adenocarcinoma individuals, respectively.