It has been reported that three glucose transporters (GLUT1, GLUT3, and GLUT4) might play crucial roles in the cellular uptake of glucose-conjugated chlorin (5,10,15,20-tetrakis[4-[b-D-glucopyranosylthio-2,3,5,6-tetrafluorophenyl]2,3,[methano[N-methyl] iminomethano] chlorin) into GIST-T1 cells [24]. The gene discussed is SLC2A1; the disease is gastrointestinal stromal tumor.