Likewise, increased HER2 copy number did not correlate with: the presence of mutation of either EGFR exon 19 (p = 1.00) or exon 20 (p = 1.00); increased EGFR copy number (p = 0.644); gender (p = 0.160); Asian ethnicity (p = 0.645); smoking status (p = 0.351); adenocarcinoma histology (p = 1.00); or gefitinib response (p = 1.00) and disease control (p = 0.114). Here, EGFR is linked to adenocarcinoma.