CASC15 and central nervous system cancer: Module 9 is highly specific in the undiffNPC cluster and includes several cancer-associated long non-coding (lnc) RNA genes (CASC15, NFIA-AS2, LINC01748, LINC00689, DNAJC27-AS1, and FEZF1-AS1) that are expressed in neuroblastoma, glioma, and other cancers (Liu et al., 2019; Russell et al., 2015; Xin et al., 2020; Zhi et al., 2015).