APEX1 and non-small cell lung carcinoma: To further verify the effect of RCSC‐EVs‐APE1 on the Erlotinib resistance of NSCLC in vivo, we constructed a xenograft model of NSCLC in nude mice by a subcutaneous injection of HCC827P cells and then used injected the mice with the HCC827R‐CSC‐EVs isolated from APE1 shRNA lentivirus‐transduced HCC827R‐CSCs or Erlotinib.