BCL6 and lymphoma: Immunohistochemical results for lymphoma cells of left cervical lymph nodes were as follows: BCL6 (+), MUM1 (+), Ki-67 (80%+), CD20 (+), Pax5 (+), BCL2 (+), CD10 (+), CyclinD1 (-), and sparsely positive for CD3, CD5, CD15, CD30, CD68, and C-MYC.