BCL6 and neoplasm: The tumor cells were positive for CD20 (Dako, Carpinteria, CA; dilution 1:100; Figure 1), PAX5 (Santa Cruz Biotechnology, Santa Cruz, CA; dilution 1:100) and MUM1 (Santa Cruz Biotechnology; dilution 1:200; Figure 2) and negative for CD10 (Novocastra; Newcastle upon Tyne, UK; dilution 1:10), BCL-6 (Dako; dilution 1:10), CD30 (Novocastra; dilution 1:100) and LMP-1 (Dako; dilution 1:100).