IDH1 and neoplasm: • Retrospective• No data on IDH mutation status (patients diagnosed between 2010 and 2014) and steroid use• NLR ≥4 was associated with increased tumor neutrophil infiltration/decreased CD3+ infiltration• Neutrophil and lymphocyte counts in isolation were not correlated with survival• Multivariate analysis adjusted for age, KPS, extent of resection, and MGMT promoter methylation status