Moreover, combined deletion of the complete 1p and 19q after unbalanced translocation between chromosomes 1 and 19 resulting in the 1p19q codeletion, homozygous deletion of CDKN2A-p16, loss of tumor suppressor genes such as TP53 and ATRX, and IDH1/2 gene mutations are common molecular alterations found in secondary GBM (Fig. 1) [2, 4]. The gene discussed is CDKN2A; the disease is glioblastoma.