SLC2A1 and neoplasm: The NAA/Cre ratio, a biomarker of neuronal density and function, was similar between all peritumoral regions indicating that the association between high Glut/Cre and IID generation did not simply reflect differences in the health of the tissue.60 Furthermore, the similar Cho/Cre ratio between regions that generated IIDs or were IID-negative suggests similar levels of lipid turnover and thus tumour infiltration in all peri-tumoural tissue.