Immunohistochemical staining of the tumor cells reveals a distinct profile, including a lack of B-lineage (CD20 and CD79α) and T-lineage (CD3) markers and CD30, but the expression of CD138 and CD38 (plasmacytic markers), variable expression levels of CD4 and CD57, and single light-chain cytoplasmic immunoglobulin A (IgA). This evidence concerns the gene CD79A and neoplasm.