t(11;18)(q21;q21)

**Semantic type:** Cell or Molecular Dysfunction

**Definition:** A chromosomal translocation involving breakpoints within the q21 band on the long arm of chromosome 11 and the q21 band on the long arm of chromosome 18. This rearrangement is associated with BIRC3-MALT1 fusion gene expression and extranodal mucosa-associated lymphoid tissue (MALT) lymphoma.

**Synonyms:** - API2-MLT Translocation - BIRC3-MALT1 Translocation