To address this apparent discrepancy between the presence of MALT1-API2 fusions at the genomic level and the absence of MALT1-API2 transcripts, we analyzed in this study MALT1-API2 expression in 14 t(11;18)(q21;q21)-positive MALT lymphoma cases, of which 9 cases were previously reported to contain a MALT1-API2 fusion at the genomic level. This evidence concerns the gene MALT1 and MALT lymphoma.