ALK and non-small cell lung carcinoma: The percentage of patients with ALK-positive NSCLC was reported in nine dossiers [7, 8, 10, 14–16, 21, 25, 27] and ranged between 1.6 and 13.5%, with nearly half of them [8, 16, 21, 25] reporting a range between 2.0 and 7.0%.