Such deletion involving the N-terminal part of the MALT1 gene or the C-terminal part of the API2 gene is however not a general observation in MALT lymphomas with t(11;18)(q21;q21), as a more recent genomic characterization of 19 t(11;18)(q21;q21)-positive MALT lymphomas demonstrated in 13 cases the generation of a genomic MALT1-API2 fusion, with only small and mostly intronic deletions, duplications and/or insertions. This evidence concerns the gene BIRC3 and MALT lymphoma.