ARID1A and aneurysmal bone cyst: Otherwise, 5 of the 6 DLBCLs defined as unclassified by the Lymph2Cx assay were classified as ABC DLBCLs, including two samples harboring a CD79B mutation, which is usually associated with the ABC signature, and the last case was classified as GCB DLBCL, without COO-specific mutations detected (ARID1A and CDKN2A).