ALK and neoplasm: From Chinese healthcare-system perspective, this study evaluates the impact of introducing alectinib in adjuvant therapy for stage IB (tumor ≥ 4 cm) to IIIA (UICC/AJCC 7th edition) ALK+ NSCLC on prevention of recurrence and the associated direct medical costs, compared to platinum-based chemotherapy.<h4>Methods</h4>A Markov model was developed to estimate the number of locoregional and metastatic recurrences over a 10-year period by defining four health states: disease-free survival, locoregional recurrence, metastatic recurrence, and death.