Bn. Nathwani et al., Marginal zone B-cell lymphoma: A clinical comparison of nodal and mucosa-associated lymphoid tissue types, J CL ONCOL, 17(8), 1999, pp. 2486-2492
Purpose: In the lnternational Lymphoma Study Group classification of lympho
ma, extranodal marginal zone C-cell lymphoma (MZL) of mucosa-associated lym
phoid tissue (MALT) type is listed as a distinctive entity. However, nodal
MZL is listed as a provisional entity because of questions as to whether it
is truly a disease or just an advanced stage of MALT-type MZL, To resolve
the issue of whether primary nodal MZL without involvement of mucosal sites
exists and whether it is clinically different from extranodal MALT-type ly
mphoma, we compared the clinical features of these two lymphomas.
Patients and Methods: Five expert hematopathologists reached a consensus di
agnosis of MZL in 93 patients, Seventy-three were classified as having MALT
-type MZL because of involvement of a mucosal site at the time of diagnosis
, and 20 were classified as having nodal MZL because of involvement of lymp
h nodes without involvement of a mucosal site.
Results: A comparison of the clinical features of nodal MZL and MALT-type M
ZL showed that more patients with nodal MZL presented with advanced-stage d
isease (71% v 34%; P = .02), peripheral lymphadenopathy (100% v 8%; P < .00
1), and para-aortic lymphadenopathy (56% v 14%; P < .001) than those with M
ALT-type MZL, However, fewer patients with nodal MZL had a large mass (grea
ter than or equal to 5 cm) than those with MALT-type MZL (31% v 68%; P = .0
3), The 6-year overall survival of patients with nodal MZL was lower than t
hat far patients with MALT-type MZL (56% v 81%; P = .09), with a similar re
sult for failure-free survival (28% v 65%; P = .01). Comparisons of patient
s with International Prognostic Index scores of 0 to 3 showed that those wi
th nodal MZL had lower 5-year overall survival (52% v 88%; P = .025) and fa
ilure-free survival (30% v 75%; P = .007) rates than those with MALT-type M
ZL,
Conclusion: Nodal MZL seems to be a distinctive disease entity rather than
an advanced stage of MALT-type MZL because the clinical presentations and s
urvival outcomes are different in these two types of MZL. Clinically, nodal
MZL is similar to other low-grade, node-based B-cell lymphomas, such as fo
llicular and small lymphocytic lymphomas. (C) 1999 by American Society of C
linical Oncology.