Medical records of patients with advanced ALK+ NSCLC treated with sequential therapy of first-line CRZ followed by ALEC (no intermittent systemic therapy was allowed between these two ALK-TKIs) from 4 hospitals in China were collected…. Median PFS during the period of ALEC treatment for overall cohort and CRZ-resistant patients was 15.3 months and 13.4 months respectively....Sequential therapy of first-line CRZ followed by ALEC yielded survival benefits for patients resistant to or intolerant of CRZ.