Similar to the effects of wortmannin, Glut‐1 or HIF‐1α knockout enhanced the anti‐proliferative effect of 12 Gy, with the fewest proliferating cells observed in Glut‐1 and HIF‐1α double knockout tumours following irradiation (Figure S7A,B). The gene discussed is SLC2A1; the disease is neoplasm.