NFKB1 and MALT lymphoma: Beyond TNFAIP3 and MYD88 mutations, MALT lymphoma shows rare or no mutations in other members of NF-kB pathway such as CD79A, CD79B, CARD11, BIRC3, and TNFRSF11A, which are frequently seen in other B-cell lymphomas with constitutive NF-kB activation.