NTN1 and oligodendroglioma: Elevated netrin-1 expression in gliomas, ranging from 2.16- to 4.545-fold (Supplementary Table S2), was reported in 7 of the datasets including anaplastic astrocytoma (1 dataset, n = 42), anaplastic oligoastrocytoma (2 datasets, n = 39), oligodendroglioma (1 dataset, n = 73), diffuse astrocytoma (1 dataset, n = 30) and glioblastoma (2 datasets, n = 188).