Classification of primary gastric lymphomas according to histologic features

被引:52
作者
Hsi, ED
Eisbruch, A
Greenson, JK
Singleton, TP
Ross, CW
Schnitzer, B
机构
[1] Univ Michigan, Sch Med, Dept Pathol, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Sch Med, Dept Radiat Oncol, Ann Arbor, MI 48109 USA
关键词
non-Hodgkin's lymphoma; mucosa-associated lymphoid tissue (MALT); gastric lymphoma; immunohistochemistry;
D O I
10.1097/00000478-199801000-00003
中图分类号
R36 [病理学];
学科分类号
100104 ;
摘要
Histologic features of low-grade gastric lymphomas of mucosa-associated lymphoid tissue (MALT) have been extensively described, and transformation to a large cell (high-grade) lymphoma can occur. We characterize high-grade gastric lymphoma histologically in an attempt to distinguish between MALT-type and non-MALT-type lesions. We studied a series of 60 gastric lymphomas and characterized them clinically, histopathologically, and immunophenotypically. Low-grade gastric lymphomas were classified according to established criteria. High-grade lymphomas were classified in three groups based on the presence or absence of a low-grade component and lymphoepithelial lesions (LELs): 1) high-grade MALT lymphomas appearing in low-grade MALT lymphomas (LG/HG MALT lymphoma); 2) large cell lymphoma with LELs composed of large cells (high-grade LELs) but without a low-grade component (HG MALT lymphoma); and 3) diffuse large cell lymphoma without a low-grade MALT lymphoma component or LELs (DLCL). Twenty-two lymphomas were classified as low-grade MALT lymphomas, 16 as LG/HG MALT lymphomas, 10 as HG MALT lymphomas, and 12 as DLCL. B-cell immunophenotype was confirmed in all 55 cases in which immunophenotyping was performed. Low-grade LELs were seen in all low-grade MALT lymphomas, and CD20(L26) expression confirmed B-cell phenotype in the LELs in 20 of 20 cases. Clinical follow-up was available for 56 patients (range, 1-264 months; mean, 57 months). Actuarial analysis of disease-specific survival and relapse-free survival showed that clinical stage was highly statistically significant (P < 0.0001), whereas histologic type and grade approached statistical significance. Multivariate analysis showed that clinical stage was the only significant factor in relapse-free and disease-specific survival.
引用
收藏
页码:17 / 27
页数:11
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