CD69 and oligodendroglioma: A comparison of the frequencies of the NK cell subpopulations indicated above in patients with oligodendroglioma and astrocytoma with low and high circulating Hsp70 levels revealed significantly higher frequencies in CD3−/CD56+, CD56+/CD94+, and CD56+/CD69+ NK cells in patients with oligodendroglioma and high Hsp70 levels compared to those with low Hsp70 levels and/or with healthy individuals (Supplementary Figure S1).