TNFAIP3 and MALT lymphoma: As previously mentioned, TNFAIP3 (A20) inactivation by mutation and/or deletion is frequent in MALT lymphomas, in particular in those arising in the ocular adnexa (29–54%) [145,153,167,168], although it has been described in other locations such as the dura (36%) [169], salivary gland (3%) [159] and thyroid (8%) [159], among others.