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Introduction : Alectinib is a second-generation inhibitor of anaplastic lymphoma kinase (ALK) and RET. Phase III clinical trials have established its superiority to crizotinib in the first-line ALK inhibitor-naïve setting. Studies also support its use over chemotherapy in the post-crizotinib setting. It is currently one of several FDA- and EMA-approved ALK inhibitors, and it is listed as a preferred initial therapy for treatment-naïve ALK-positive non-small cell lung cancer (NSCLC). Areas covered : Herein, the authors provide the reader with details of the chemical structure, pharmacologic properties, resistance mutations, phase I, II, and III clinical trials, and safety profile of alectinib. Furthermore, the authors provide the reader with the expert opinion and future perspectives on the drug. Expert opinion : Alectinib compares favorably to other second-generation ALK inhibitors with regards to safety, tolerability, and efficacy. Based on currently available data, it is an appropriate first-line option. Ongoing studies will better resolve the ideal sequencing of ALK inhibitors in the treatment of ALK-positive NSCLC.