Increased EGFR copy number did not correlate with: the presence of mutation in either EGFR exon 19 (p = 0.130) or exon 20 (p = 1.00); increased HER2 copy number (p = 0.644); gender (p = 0.457); Asian ethnicity (p = 0.688); smoking status (p = 0.380); adenocarcinoma histology (p = 0.538); or response to gefitinib (p = 1.00). Here, ERBB2 is linked to adenocarcinoma.