The prevalence of CD3−/CD56+ NK cells (Figure 5C) is similar in patients with oligodendroglioma, astrocytoma, and GBM (median frequencies of 7.9%, 10.7%, and 7.7%, respectively), with no significant differences to the frequency of this cell type in the healthy controls (median frequency of 11.1%). Here, NCAM1 is linked to glioblastoma.