Since adenocarcinomas are typically heterogeneous, with areas of well-, moderately-, and poorly-differentiated cancer nests coexisting in the same tumor mass, also glucose transporter expression is heterogeneous, with the well-differentiated areas of the tumors expressing SGLT2 and the poorly-differentiated areas expressing GLUT1 (Figure 6) [3]. The gene discussed is SLC2A1; the disease is neoplasm.