However, when the glucose level was low (≤1 mM), CRC cells in which SLC2A3 had been deleted showed a lower growth rate than CRC cells in which SLC2A1 had been deleted (Fig. 4b), indicating that GLUT3 is more important than GLUT1 for CRC cell growth under conditions of glucose deficiency. This evidence concerns the gene SLC2A1 and colorectal carcinoma.