A variety of spindle cell tumors exhibit KIT positivity, including mesothelioma [24], leiomyosarcoma [24], clear cell sarcoma [24], rhabdomyosarcoma [24], synovial sarcoma [24], angiomyolipoma [25,26], bladder urothelial carcinoma [24,27], and malignant melanoma [27]. This evidence concerns the gene KIT and mesothelioma.