Furthermore, similar to our internal cohort (Fig. 1D), SSTR1 and SSTR2 AUC analyses were significantly different in all the external cohorts (AUC > 0.95; Fig. S1 –S4C, respectively), remarking the potential of SSTR1 and SSTR2 as diagnostic biomarkers of GBM. Here, SSTR2 is linked to glioblastoma.