CD8A and glioblastoma: Univariate ANOVA revealed no correlation between dexamethasone but between WHO IV° histology and CD3+ and CD8+ cell numbers (effect estimates for CD3+: for WHO IV° − 623/μl (95% CI − 962 to − 284), p = 0.001, and for dexamethasone − 55/μl (95% CI − 338 to 228), p = 0.695; effect estimates for CD8+: for GBM − 227/μl (95% CI − 397 to − 56), p = 0.011, and for dexamethasone − 26/μl (95% CI − 168 to 116), p = 0.716).