EGFR and squamous cell carcinoma: HCC827 is a lung adenocarcinoma cell line harboring an activating mutation in EGFR (exon 19 deletion (55)), H1869 is a squamous cell carcinoma cell line with wild-type EGFR previously reported to be sensitive to EGFR-TKIs (56), and H1666 is a lung adenocarcinoma cell line also with wild-type EGFR and reported to be sensitive to EGFR-TKIs (57).