EGFR and non-small cell lung carcinoma: In a primary screen, EGFR mutant non-small cell lung cancer cells (PC9 cell line) were transfected with the miRNA libraries and cultured in the presence or absence of the EGFR kinase inhibitor erlotinib for 3 days, followed by a 3-day drug-free recovery phase to identify miRNAs that specifically affect DTPs (Fig. 1a).