A total of 51 patients who had received platinum plus pemetrexed were included for outcome analysis….Of note, patients with ALK V3a/b had a worse OS (HR 4.24 [95% CI 1.18–15.21], P = 0.026) (Fig. 3b). In multivariate analysis, ALK variant 3a/b remained an independent predictor of a poor OS (aHR 9.62 [95% CI 1.90–48.80], P = 0.006).