BCL6 and diffuse large B-cell lymphoma: Approximately 50% of DLBCL express Bcl-6 in a variable proportion of tumor cells (Fig. 3 and 4A) (Skinnider et al. 1999; King et al. 2000; Artiga et al. 2002; Pileri et al. 2002; Braaten et al. 2003; Colomo et al. 2003; de Leval and Harris, 2003; Chang et al. 2004).