On histopathologic staining, cells were negative for glucose transporter 1 (GLUT-1) and human herpesvirus-8 (HHV8), but diffusively positive for D2-40 within the spindles, consistent with a diagnosis of kaposiform hemangioendothelioma (KHE). The gene discussed is SLC2A1; the disease is kaposiform hemangioendothelioma.