There was, however, significant variation in the percentage of cells staining positive for GLUT-1 in individual tumours: median staining of 60% (0–90%) was observed by Gronroos and colleagues [70], 26% (0–60%) by Choi et al. [65], and 65.60% (±25.67) by Azad et al. [61]. This evidence concerns the gene SLC2A1 and neoplasm.