Approximately 35% of DLBCL express CD10 (Fig. 3 and 4B) (Dogan et al. 2000; King et al. 2000; Fabiani et al. 2002; de Leval and Harris 2003; Tzankov et al. 2003a; Hans et al. 2004), but the prognostic relevance of such expression is controversial. The gene discussed is MME; the disease is diffuse large B-cell lymphoma.