CCNA2 and glioblastoma: Top hub nodes from glioblastoma multiforme networks contain six matches, namely cyclin dependent kinase 2 (CDK2), cyclin A2 (CCNA2), cyclin B1 (CCNB1), erb-b2 receptor tyrosine kinase 2 (HER2), cyclin E1 (CCNE1), and cyclin D3 (CCND3).