The prognostic role of preoperative systemic immune-inflammation index and albumin/globulin ratio in patients with newly diagnosed high-grade glioma.

•Biomarkers of inflammation and malnutrition predict prognosis in malignancies.•The preoperative SII and AGR are correlated with patient survival in various cancers.•The preoperative SII and AGR have prognostic value in high-grade glioma patients.