CDKN2A and gastric diffuse large B-cell lymphoma: Promoter hypermethylation of p16/CDKN2A occurs quite frequently in gastric lymphoid follicles with Helicobacter pylori infection, gastric marginal zone lymphomas of mucosal associated lymphoid tissues (MALTs), and gastric diffuse large B cell lymphomas (DLBCLs), accounting for 10%, 41.7% and 72.7% of these cases, respectively in a Korean study[22].