Abstract :
[en] Background:Diffuse large B-cell lymphomas (DLBCLs) arising in specific extranodal sites have peculiarclinicopathologic features.Patients and methods:We analyzed a cohort of 187 primary Waldeyer’s ring (WR) DLBCLs retrieved from GELAprotocols using anthracyclin-based polychemotherapy.Results:Most patients (92%) had stage I–II disease. A germinal center B-cell-like (GCB) immunophenotype wasobserved in 61%, and BCL2 expression in 55%, of WR DLBCLs.BCL2,BCL6,IRF4andMYCbreakpoints wereobserved in, respectively, 3 of 42 (7%), 9 of 36 (25%), 2 of 26 (8%) and 4 of 40 (10%) contributive cases. A variablefollicular pattern was evidenced in 30 of 68 (44%) large biopsy specimens. The 5-year progression-free survival (PFS)†These authors contributed equally to this work.*Correspondence to: Professor Dr L. de Leval, Department of Laboratories, Institute ofPathology, CHUV, rue du Bugnon 25, 1011 Lausanne, Switzerland. Tel: +41-31-314-71-94; Fax: +41-31-314-72-05; E-mail: laurence.deleval@chuv.chAnnals of Oncologyoriginal articles© The Author 2012. Published by Oxford University Press on behalf of the European Society for Medical Oncology.All rights reserved. For permissions, please email: journals.permissions@oup.com.Downloaded from https://academic.oup.com/annonc/article-abstract/23/12/3143/175938 by University of Liege user on 24 October 2019
and the overall survival (OS) of 153 WR DLBCL patients with survival information were 69.5% and 77.8%, respectively.The GCB immunophenotype correlated with a better OS (P= 0.0015), while BCL2 expression predicted a worse OS(P= 0.037), an effect overcome by the GCB/non-GCB classification. Compared with matched nodal DLBCLs, WRDLBCLs with no age-adjusted international prognostic index factor disclosed a better 5-year PFS rate (77.5% versus70.7%;P= 0.03).Conclusions:WR DLBCLs display distinct clinicopathologic features compared with conventional DLBCLs, with usuallocalized-stage disease, common follicular features and a high frequency of GCB immunophenotype contrasting with alow rate ofBCL2rearrangements. In addition, they seem to be associated with a better outcome than their nodalcounterpart
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