Regarding EFS, only tumor site (p=0.015) reached statistical significance while stage III-IV (p=0.05), c-Kit (p=0.16), VEGFR2 (0.29), PDGFRα (p=0.0.25) or PDGFRβ expression (p=0.8) failed to reach statistical significance. The gene discussed is PDGFRA; the disease is neoplasm.