Glucose transporter type I (GLUT1), a prototype member of GLUT superfamily, is a membrane-associated erythrocyte glucose transport protein.1 It is a major glucose transporter in the mammalian blood-brain barrier, and also mediates glucose transport in endothelial cells of the vasculature, adipose tissue, and cardiac muscle.1 GLUT1 is detectable in many human tissues including those of colon, lung, stomach, esophagus, and breast.1 GLUT1 is overexpressed in malignant cells and in a variety of tumors that include the breast, pancreas, cervix, endometrium, lung, mesothelium, colon, bladder, thyroid, bone, soft tissues, and oral cavity.1 Immunohistochemical detection of GLUT1 has been shown to discriminate between reactive mesothelium and malignant mesothelioma in more than one study.1-3