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  • Follicular lymphoma grade 3B.

Follicular lymphoma grade 3B.

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Published:13th Apr 2011
Author: Salaverria I, Siebert R.
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Ref.:Best Pract Res Clin Haematol. 2011 Jun;24(2):111-9.

ABSTRACT: Follicular lymphoma (FL) grade 3B (FL3B) is defined as FL with more than 15% centroblasts per high resolution field present as solid sheets. Coexistence with diffuse large B-cell lymphoma (DLBCL) is frequent. In contrast to other FL, FL3B frequently lack CD10 expression (approximately 50% of cases), show lower probability of BCL2 expression (69% positive) and increased TP53 expression (31% positive). The t(14;18) hallmark translocation of FL is present in only around 13% of FL3B. In contrast, translocations affecting the BCL6 locus in 3q27 are frequent (44%). Overall, FL3B in many features resembles DLBCL. The presence of a diffuse component in FL3B has been related to an unfavorable outcome except for pediatric FL3B that presents in 60% of the cases this DLBCL component. In this chapter we sought to review the present knowledge on morphological, cytogenetic and molecular features in FL3B.


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