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Crizotinib was approved for the treatment of ROS1-rearranged non-small cell lung cancer (NSCLC) patients in the US on 11 March, 2016. Interestingly no one companion diagnostic test (CDx) has been approved simultaneously with this approval of crizotinib. Hence, an ideal and adequate CDx will have to be able to identify ROS1 fusions without the knowledge of the fusion partners to ROS1, and as to date...