SLC2A1 and breast carcinoma: In this case, the authors found a positive correlation between FDG uptake and GLUT-1 expression, the mitotic activity index, the number of tumor cells, expression of hexokinase type I, and microvessel density, concluding that FDG uptake in breast cancer could be related to the microvessel density, GLUT-1 expression, activity of hexokinase-I, and proliferation rate, among other factors.