All the incorrectly diagnosed cases were presumed to be either plasma cell neoplasms, such as multiple myeloma and solitary plasmacytoma, or B cell neoplasms, such as DLBCL, anaplastic variant (CD30 positive), and extranodal MALT lymphoma with plasmacytoid differentiation. This evidence concerns the gene TNFRSF8 and MALT lymphoma.