Gray zone lymphoma effectively treated with cyclophosphamide, doxorubicin, vincristine, prednisolone, and rituximab chemotherapy: A case report

Figure 4 Immunohistochemical staining of lymphoma cells. A: The cells were strongly and uniformly positive for CD20 (× 400); B: Strongly positive for PAX5 (× 400); C: Variably positive for CD30 [weakly positive (C1) or moderately to strongly positive (C2)] (× 400); D: Moderately to strongly positive for MUM1 (× 400); E: OCT2 was strongly positive for large atypical cells (80%); F: BOB1 strongly positive large atypical cells (inserted) were found in small numbers (< 10%).