泪腺黏膜相关淋巴组织淋巴瘤的病理特征及BCL10和MALT1的表达和意义

Pathological features of lacrimal gland mucosa-associated lymphoid tissue lymphoma and the expression and significance of BCL10 and MALT1

目的探讨泪腺黏膜相关淋巴组织(MALT)淋巴瘤的病理形态特征及肿瘤组织中BCL10和MALT1的表达和意义。方法选取19例泪腺MALT淋巴瘤患者(19眼,其中右眼9例,左眼10例)的病变泪腺组织标本为实验组,8例行眶内容物摘除患者(8眼,其中右眼3例,左眼5例)的正常泪腺组织标本为对照组。采用HE染色观察泪腺组织形态特征,采用免疫组织化学染色观察泪腺中BCL10和MALT1的表达情况。结果实验组出现边缘区B细胞以及单核细胞样、小淋巴细胞样和浆细胞样肿瘤细胞浸润,偶见大细胞分布其中,可见肿瘤细胞侵入淋巴滤泡和上皮内,破坏正常结构,形成滤泡定植和淋巴上皮病变。实验组BCL10和MALT1的阳性表达面积明显高于对照组,差异均有统计学意义(Z=-2.177,P=0.029;t=3.237,P=0.003)。结论泪腺MALT淋巴瘤出现了弥漫分布的边缘区B细胞和形态多样的肿瘤细胞、获得性淋巴滤泡及大细胞散在分布的病理改变,这可能与BCL10和MALT1表达上调导致的细胞凋亡阻断有关。

Objective To investigate the pathomorphological features of mucosa-associated lymphoid tissue(MALT)lymphoma of the lacrimal gland and the expression and significance of BCL10 and MALT1 in tumor tissues.Methods Diseased lacrimal gland tissue specimens from 19 patients with lacrimal gland MALT lymphoma(19 eyes,including nine right eyes and ten left eyes)were selected as the experimental group,and normal lacrimal gland tissue specimens from eight patients with orbital content removal(eight eyes,including three right eyes and five left eyes)were selected as the control group.Hematoxylin-eosin(HE)staining was performed to observe the morphological characteristics of the lacrimal gland tissues,and immunohistochemical(IHC)staining was performed to observe the expression of BCL10 and MALT1 in the lacrimal gland tissues.Results In the experimental group,marginal B cells,monocyte-like tumor cells,small lymphocyte-like tumor cells,and plasma cell-like tumor cells appeared in the marginal zone.Large cells were occasionally distributed among these cells.The tumor cells invaded the lymphoid follicles and epithelium,destroyed normal tissue structure,and formed follicular colonization and lymphoepithelial lesions.The positive expression area of BCL10 and MALT1 in the experimental group was significantly larger than that in the control group(Z=-2.177,P=0.029;t=3.237,P=0.003).Conclusion Lacrimal gland MALT lymphoma shows pathological changes in diffusely distributed marginal B cells and tumor cells with diverse morphology,acquired lymphoid follicles,and scattered distribution of large cells.This may be related to apoptosis blockage caused by the upregulation of BCL10 and MALT1 expression.