Loss of CD20 expression following treatment with rituximab (chimaeric monoclonal anti-CD20): a retrospective cohort analysis.

Abstract:

:A retrospective analysis of CD20 expression following rituximab for B-cell non-Hodgkin's lymphoma demonstrated a significant change in immunophenotype in 6/25 (24%) patients with persistent bone marrow (BM) infiltration. In three out of six patients, the B cells were uniformly CD20-/CD79alpha+, consistent with frank loss of CD20 expression. In the remaining three cases, the BM infiltrate was predominantly (> 80%) CD20-/CD79alpha+. Two of the former but none of the latter three cases achieved a clinical response. In three further cases, the post-treatment BM infiltrate was composed entirely of benign or reactive CD3+ T cells. Frank loss of CD20 was not seen in 25 post-treatment lymph node biopsies. Immunophenotyping is therefore an important adjunct in the diagnosis of BM infiltration following rituximab.

journal_name

Br J Haematol

authors

Foran JM,Norton AJ,Micallef IN,Taussig DC,Amess JA,Rohatiner AZ,Lister TA

doi

10.1046/j.1365-2141.2001.03019.x

subject

Has Abstract

pub_date

2001-09-01 00:00:00

pages

881-3

issue

4

eissn

0007-1048

issn

1365-2141

pii

bjh3019

journal_volume

114

pub_type

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