When analysing the uptake values in 13 non-enhancing tumours (9 grade II and 4 grade III) separately, the median MET T/N ratios in IDH1-mutant (n = 10) and IDH1-wildtype (n = 3) tumours were 2.09 (IQR 1.87–3.44) and 3.21 (2.52–3.59), respectively. The gene discussed is IDH1; the disease is neoplasm.