- Clinical diagnosis of infantile hemangioma confirmed by tissue biopsy positive for GLUT-1 Immunohistochemical staining. If the risk of bleeding or permanent disfigurement from biopsy is believed to be too great then clinical and radiological characteristics may be used to establish the diagnosis after discussion with the study PI. Patients with GLUT-1 negative vascular tumors such as Kaposiform hemangioendothelioma, tufted angioma, and angiosarcoma are not eligible.