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p53 overexpression as a marker of poor prognosis in mantle cell lymphomas
with t(11;14)(q13;q32)
DC Louie, K Offit, R Jaslow, NZ Parsa, VV Murty, A Schluger and RS Chaganti
Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York,
NY 10021, USA.
The t(11;14)(q13;q32) translocation, which juxtaposes the BCL1 oncogene
with the Ig heavy chain locus, has been associated with an uncommon subtype
of non-Hodgkin's lymphoma (NHL) termed mantle cell lymphoma (MCL). To date,
no molecular marker that serves as an indicator of tumor progression or
clinical prognosis has been described for NHLs with this translocation. We
examined a panel of NHLs with t(11;14) for overexpression of p53 and
correlated the results with single-strand conformation polymorphism (SSCP)
analysis, karyotypic features, and clinical course. NHLs with t(11;14) were
identified from 30 patients. The diagnosis was MCL for 23 of 30, small
lymphocytic lymphoma for 4 of 30, and diffuse large-cell lymphoma for 3 of
30 cases. The results of immunohistochemistry analysis using a monoclonal
anti-p53 antibody on paraffin-embedded specimens were compared with the
SSCP data, the tumor karyotypes, and clinical course of each patient. DNA
sequencing of exons was performed on cases that showed conformational
changes by SSCP analysis. NHLs from 5 of 23 patients with MCL were positive
for p53 overexpression. Deletions of chromosome 17p were identified in 2 of
30 cases, both of which were MCLs showing p53 overexpression. Two of the
five MCLs with p53 overexpression showed evidence for TP53 mutations. None
of the 18 MCLs negative for p53 overexpression showed conformational
changes by SSCP. For these 18 patients with MCLs that did not overexpress
p53, the median survival was 63 months, compared with 12 months for the 5
patients with MCLs positive for p53 overexpression (P < .001). These
results suggest that p53 overexpression in MCL with t(11;14)(q13;q32) may
serve as a marker of poor prognosis.
Volume 86,
Issue 8,
pp. 2892-2899,
10/15/1995
Copyright © 1995 by The American Society of Hematology

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