NRXN1 and neoplasm: In addition, OGM allowed for the characterization of novel genomic alterations, including amplification and overexpression of the GPC5 gene on chr13q31.3 in a Group 3 MB tumor, as well as recurrent SVs affecting the NRXN1 gene on chr2p16.3 by deletion or translocation in subsets of MB Group 3 and 4 tumors.