Combination TS‐1 plus EGFR‐tyrosine kinase inhibitors (TKIs) for the treatment of non‐small cell lung cancer after progression on first‐line or further EGFR‐TKIs: A phase II, single‐arm trial

EGFR‐tyrosine kinase inhibitors (TKIs) combined with TS‐1 might overcome EGFR‐TKI resistance, which has been indicated by several preclinical studies. We investigated the synergistic efficacy and safety of the combination therapy of EGFR‐TKIs and TS‐1 in non‐small cell lung cancer (NSCLC) patients with acquired resistance to previous EGFR‐TKI therapy