Next, we investigated whether 8PN‐mediated CDCP1 reduction can increase the sensitivity to EGFR TKI in EGFR TKI‐resistant lung cancer cells, including H1650 (EGFR exon 19 deletion and PTEN mutant) and H1975 (EGFR L858R) cells. The gene discussed is PTEN; the disease is lung cancer.