 This randomized, multicenter, Phase III, open-label study will evaluate the efficacy and safety of alectinib versus crizotinib and to evaluate the pharmacokinetics of alectinib in asian participants with treatment-naive ALK-positive advanced NSCLC. Participants will be randomized 2:1 into one of the two treatment groups to receive either alectinib 600 milligrams mg twice daily BID or crizotinib 250 mg BID orally, respectively. 