CD138/B-B4 expression in AIDS-related extranodal NHLs with plasma cell differentiation. (A) HHV-8⁺ body cavity–based lymphoma. (B) Plasmablastic lymphoma. (C) “Intermediate” lymphoma. (A) cytospin preparation; APAAP (alkaline phosphatase anti-alkaline phosphatase) technique. Original magnification × 800. (B), (C) paraffin section; APAAP technique. Original magnification × 400.