NTRK1 and inflammatory myofibroblastic tumor: Accompanying gene rearrangements of ROS1, NTRK1/3, RET, and PDGFRβ or accompanying gene fusions of ETV6-NTRK3, TIMP3-ROS1, and TIMP3-RET were detected in a few of non-ALK-rearranged IMT (14–17).