MDK and central nervous system cancer: To characterize and better understand the role of midkine (MDK) in gliomas, we downloaded uniformly processed RNA-Seq abundance values from recount-brain, a curated repository for human brain RNA-Seq datasets, for four different uniformly processed datasets of adult gliomas and healthy brain tissue controls: 643 glioma samples from the cancer genome atlas (TCGA), 268 glioma samples from Chinese glioma genome atlas (CGGA), 93 glioma samples from SRP044668 and 48 glioma samples from ERP010930.