No evidence was found that CD20 was lost on CD19 positive lymphomas with mutant TP53; however, 50% (n = 8/16) were negative for PAX5 compared with only 15% (n = 9/62) of DLBCL with wild-type TP53 (p = 0.002). This evidence concerns the gene PAX5 and diffuse large B-cell lymphoma.