Among the detected variants was the CCDC26 intronic SNP (rs55705857, chr8:130645692 in the hg19 and chr8:129633446 in the hg38 genome)) (Finnish population frequency 0.09), which has been associated with an approximately sixfold relative risk of developing oligodendroglioma or IDH-mutant astrocytoma24,25. This evidence concerns the gene CCDC26 and oligodendroglioma.