BCL6 and neoplasm: The tumor cells stained positive for CD20 (diffuse, strong), CD79a (diffuse+), Ki67 (90%), BCL6 (+), CD10 (weak, sun), BCL6 (+), and c-Myc (30%), and negative for CD5, cyclinD1, CD23, CD21, BCL2, MUM1, CD30, and p53 (wild type), which was consistent with a diagnosis of diffuse large B-cell lymphoma.