More recently, Gao et al reported that miR-138-5 is deeply downregulated in gefitinib-resistant PC9 (harbouring delE746-A750) NSCLC cell lines, while its re-expression sensitise PC9/GR cells and another gefitinib-resistant EGFR-mutated NSCLC cell line, H1975 (harbouring both L858R/T790M mutations), to gefitinib. The gene discussed is EGFR; the disease is non-small cell lung carcinoma.