BCL6 and neoplasm: mmunohistochemical staining showed that the tumor cells were positive for CD20 (Fig. 3D), CD79a, PAX-5, Bcl6 (Fig. 3F), MUM-1 (Fig. 3G), CD19, c-Myc (Y69) (40%) (Fig. 3H), and Bcl2 (80%) (Fig. 3I).