CSPG4 and malignant glioma: In addition to NG2, we and others showed that many cellular markers typically expressed in OPCs, such as Olig2, PDGFRa, and O4, were also expressed in most, if not all, human malignant gliomas (Shoshan et al., 1999; Ligon et al., 2004, 2007; Rebetz et al., 2008; Ledur et al., 2016; Shao et al., 2017).