In line with our findings, previous cohort studies found no association between glioma risk and levels of IL‐13, TNF‐α, CXCL13, MIP‐1α, MIP‐1β, fractalkine, FGF2, TGF‐α, sCD23, sCD27 and sCD30.10, 11, 12. This evidence concerns the gene TNF and central nervous system cancer.