MALT1 and MALT lymphoma: In molecular biology, MALT lymphoma has four types of chromosomal ectopicity: t(11;18)/API2-MALT1 (the most common) and t(1;14)/IgH-BCL10, t(14;18)/IgH-MALT1, and t(3;14)/IgH-FOXP1 (relatively rare).