Patients were aged 18 years or older, had stage IIIb or stage IV ALK-positive NSCLC that had progressed while they were on crizotinib therapy...Alterations that could mediate bypass signalling pathways (n=5)...Ensartinib had poor activity in patients with genetic alterations that could have mediated bypass signalling (eg, mutations in EGFR, KRAS, and PIK3CA)