MALT1 and diffuse large B-cell lymphoma: A comparison of the effects of the MALT1 phenothiazine, thioridazine and mepazine inhibitors on DLBCL cell lines showed that mepazine was the most effective cellular MALT1 inhibitor and decreased MALT1 activity by 75% in all ABC-DLBCL cell lines tested [189, 214].