BCL-2 expression in HRS cells of cHD.

(A-B) Nodular sclerosis with strong expression of BCL-2 in HRS cells. (C-D) Mixed cellularity with weak BCL-2 expression in HRS cells. (E-F) Nodular sclerosis with BCL-2⁻ HRS cells. The small reactive lymphocytes stained positively for BCL-2 and served as internal positive controls in all panels. Original magnifications A, C, E, × 100; B, D, F, × 400.