In line with these findings, we detected high HDAC9 protein levels among various lymphoma entities, including DLBCL (n=34), marginal zone lymphoma (MZL) (n=5), follicular lymphoma (FL) (n=9), classical Hodgkin lymphoma (CHL) (n=3) and mantle cell lymphoma (MCL) (n=6). This evidence concerns the gene HDAC9 and classic Hodgkin lymphoma.