For example, PDGFRA-mutated GISTs, found mainly in the stomach, may frequently show epithelioid cell features, and SDH-GISTs are located mainly in the stomach and show epithelioid features separated by fibrous bands, whereas NF1-mutated GISTs usually appear as spindle cell tumors in the small intestine [19,20,21,22,25,40]. Here, SDHB is linked to spindle cell neoplasm.