SLC2A1 and neoplasm: Staining intensity was reported by numerous authors, and although the vast majority of tumours fell into the “moderate” to “high” ranges, there were drastically different findings, with intense staining (IHC score ≥ 3) of GLUT-1 found to range from 0.3% to 63% in eight studies [52,54,56,63,64,72,73,76].