SLC2A1 and hepatocellular carcinoma: Reverse transcription-polymerase chain reaction (RT-PCR) results indicated that GLUT1 but not GLUT2 was expressed in COS-7 and SKOV3 cells; however, both GLUT1 and GLUT2 were detected in HepG2 human hepatocellular carcinoma cells (Figure 1A).