Biom-36. preoperative immune and inflammatory factors in peripheral blood predict prognosis of glioma and correlate with grades and subtypes: a prospective multi-institutional study of 1282 patients

Abstract BACKGROUND Peripheral blood immune and inflammatory factors can reflect glioma patients' immune status and inform anti-tumor immunotherapy, but research in this field is limited compared to tumor microenvironment studies. We aim to investigate the relationship between these circulating factors and glioma grades, subtypes, and prognosis. METHODS From October 2006 to April 2022, 1282 patients with primary gliomas were enrolled in this study, and their preoperative peripheral blood was collected. Correlations between immune and inflammatory factors and different glioma grades and subtypes were analyzed using ANOVA, t-test, and Ordinal Logistic Regression. ROC curve analysis was used to evaluate the diagnostic efficiency of these factors. In addition, the Cox regression model, K-M survival analysis, and other methods were used to study the relationship between these factors and the prognosis and survival of patients. RESULTS The results showed that with the higher clinical grade, the percentage of NK cells in peripheral blood increases while the percentage of Th and T lymphocytes decreases. C4 levels and percentage of B lymphocytes were higher in grade I gliomas than in other grades. The percentage of NK and Th cells also correlated with glioma subtypes. Immunoglobulin light chains were associated with a favorable prognosis, whereas a higher percentage of peripheral B lymphocytes in grade IV patients was associated with a poor prognosis. CONCLUSIONS The relationship between immune and inflammatory factors and the grades and subtypes of glioma can offer potential opportunities to intervene in these factors that could improve the prognosis of glioma patients. Additionally, it may be helpful to screen glioma and anti-tumor immunotherapy.