Forkhead box protein P1 expression in mucosa-associated lymphoid tissue lymphomas predicts poor prognosis and transformation to diffuse large B-cell lymphoma

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
Xavier SagaertChristiane De Wolf-Peeters

Abstract

Gene expression profiling studies have reported upregulated mRNA expression of forkhead box protein P1 (FOXP1) in response to normal B-cell activation and high expression in a poor prognosis subtype of diffuse large B-cell lymphoma (DLBCL). Recently, it was also found that FOXP1 rearrangements and expression of its protein occur in mucosa-associated lymphoid tissue (MALT) lymphomas. In this study, we investigated FOXP1 expression in its relationship to morphology, genetic features, and prognosis in a series of 70 MALT lymphomas. All samples were morphologically reviewed and stained for FOXP1. Presence of structural and/or numeric aberrations of the FOXP1, BCL10, and MALT1 genes was investigated. For all patients, a complete clinical data set was collected. We detected nuclear expression of FOXP1 in 20 of the 70 MALT lymphomas (nine of them featuring structural or numeric aberrations of the FOXP1 locus). FOXP1 positivity was confined to MALT lymphomas with poor clinical outcome (with impact of FOXP1 expression on relapse rate and disease-free survival). It was also found that MALT lymphomas with strong FOXP1 expression are at risk of transforming into an aggressive DLBCL of nongerminal center phenotype if they feature, in additi...Continue Reading

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