CDKN2A and glioblastoma: With the analysis of database Merged Cohort of LGG and GBM (TCGA, Cell 2016), we found that the rate of CDKN2A locus 9p21.3 deletion was up to 35.3% in GBM, and the rate of CDKN2B locus 9p21.3 deletion was up to 34.8%.