We performed EGFR TAP in two lung cancer cell lines: PC9 cells, which harbor an exon 19 deletion E746-A750 EGFR mutation and contain five copies of the EGFR gene per cell, and HCC827 cells, which harbor an exon 19 deletion E746-A750 EGFR mutation and contain 35 copies of the EGFR gene per cell (Soh et al, 2009). The gene discussed is EGFR; the disease is lung carcinoma.