A phase III study comparing EGFR tyrosine kinase inhibitor (EGFR-TKI) monotherapy and EGFR-TKI with inserted cisplatin (CDDP) plus pemetrexed (PEM) as a first-line treatment in patients (pts) with advanced non-squamous non-small-cell lung cancer (NSqNSCLC) harboring EGFR activating mutation (EGFR-NSqNSCLC): JCOG1404/WJOG8214L, AGAIN study.