IDH1 and central nervous system cancer: As presented in Fig. 3b, anaplastic oligodendroglioma, IDH-mutant and 1p/19q-codeleted with high or low SSTR2A protein expression presented with a lower Ki-67 labelling index when compared to SSTR2A negative gliomas (median Ki-67 expression = 15% in SSTR2A positive gliomas versus 26% in SSTR2A negative, p < 0.001).