ALK and inflammatory myofibroblastic tumor: As shown in Table 4, by categorizing the sites of origin into visceral (pulmonary, gastrointestinal tract, and urinary system) and nonvisceral (hand and neck, extremities, and genital region) organs, visceral organs tended to present a higher percentage of ALK positivity than IMT with nonvisceral organ origin, and none of the IMT from nonvisceral organs displayed a positive expression of ALK.