In specific, GCT tumors expressed a significant lower level of PPARγ protein compared to osteosarcoma (P < 0.0001) and Ewing Sarcoma tumors (P < 0.0001); while the protein level of PPARγ protein was significantly higher in osteosarcoma tumors compared to Ewing Sarcoma tumors (P = 0.001). The gene discussed is PPARG; the disease is osteosarcoma.