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Immunohistochemical features of the nodal lymphoma: the neoplastic cells express CD20 (A), MUM1/IRF4 (B) and c-myc (D), with focal positivity for Bcl-6 (H); a high proliferative index is demonstrated by Ki67 immunostaining (C); also, the large atypical blasts proved negative for CD138 (E), CD30 (F), CD10 (G), and for BCL2 (I).
