Of the 65 patients with ALK-positve NSCLC who underwent treatment failure of crizotinib, 43 (66.2%) received alectinib and 22 (33.8%) received ceritinib...The median follow-up duration was 16.8 months and 32.0 months in the alectinib and ceritinib groups, respectively....The tumor response was estimable in 63 patients (41 treated with alectinib and 22 treated with ceritinib), with the CR and PR being 2.4 and 70.8%,respectively, in the alectinib group and the PR being 50% in the ceritinib group.