Molecular pathogenesis of follicular lymphoma.

t(14;18) translocation has been recognized as a genetic hallmark of follicular lymphoma (FL), but it is now known that additional genetic aberrations are required for the development of FL. With recent advances in the technology for DNA analysis, recurrent gene aberrations such as TNFRSF14, EPHA7, EZH2, CREBBP, EP300, MLL2 and MEF2B have been identified. A few t(14;18)-positive B cells can be detected in healthy individuals, and these B cells are reported to have their own biological features that are closely associated with the pathogenesis of FL. On the other hand, FL is characterized by a unique microenvironment. Further understanding of the pathogenesis of FL is expected to contribute to the development of novel treatment approaches for this disease.