GLUT1 also appears to be the predominant glucose transporter in many types of cancer cells [14], [15], [16], [17], [18], [19], including breast cancer, although expression of GLUT2, GLUT3, GLUT5, GLUT6 and GLUT12 have been detected in cancer cells using immunohistochemistry or RNA analysis [14], [16], [18], [20]. This evidence concerns the gene SLC2A3 and cancer.