Immuno-histochemical staining showed CD20-positive (8/8), IgD-positive in 2 of the 4 cases (2/4), CD5-positive in 1 of the 4 cases (1/4), 6 of the 6 cases were bcl-2-positive, cyclin D1-negative and bcl-6/CD10-negative, CD43-negative in 5 of the 6 cases (5/6). 