A study confirming the occurrence of LOH most frequent on chromosome 9 found four patients with biallelic deletion 9p21.3 (three of them had LOH) of the tumor suppressor gene cluster (CDKN2A, CDKN2BAS1, CDKN2B, and DMRTA1), which is fully consistent with our research [21]. The gene discussed is CDKN2B; the disease is neoplasm.