Patients with advanced non-small-cell lung cancer (NSCLC) and EML4–ALK fusion were enrolled...The primary endpoints were objective response rate (ORR) and progression-free survival (PFS) to alectinib.…we found that “crizotinib pretreatment”, “liver metastasis”, and “TP53 co-mutation” were individually associated with shorter PFS in alectinib treatment.