Fig. 1: BCL2 expression pattern in diffuse large B-cell lymphoma (DLBCL).

A BCL2 score 0 shows no BCL2 expression in almost all tumor cells or weak BCL2 expression in very few cells. B BCL2 score 1 shows weak or moderate-intensity BCL2 expression in a subset of tumor cells (<50%). C BCL2 score 2 shows moderate or higher intensity BCL2 expression in most tumor cells (>50%), but the expression pattern is heterogeneous. D BCL2 score 3 shows uniformly strong BCL2 expression in almost all tumor cells.