SNAI2 is not specific for malignant tumors of epithelial origin; it also contributes to the metastasis of tumors of mesenchymal origin, such as osteosarcoma [18], chondrosarcoma [19], Ewing sarcoma [20], leiomyosarcoma [21], rhabdomyosarcoma [22], synovial sarcomas [23], GISTs [11], fibrosarcoma [24], and even Kaposi sarcoma [25, 26]. This evidence concerns the gene SNAI2 and cancer.