Abstract
目的 研究E-cadherin及β-catenin在泪腺多形性腺瘤和腺样囊性癌中的表达.方法 选取经病理检查确诊为泪腺多形性腺瘤的患者11例11眼和腺样囊性癌的患者6例6眼,分别行E-cadherin和β-catenin免疫组织化学染色.选取泪腺脱垂患者的泪腺组织6例作为正常对照组.结果 正常泪腺组织中E-cadherin呈强阳性表达,主要位于细胞膜;而在泪腺多形性腺瘤中E-cadherin呈弱阳性表达,主要位于细胞质.E-cadherin在腺样囊性癌中未见表达.3组中E-cadherin阳性表达的样本数差异有统计学意义(H=16.492,P=0.000);正常泪腺组E-cadherin阳性表达的样本数明显高于多形性腺瘤组和腺样囊性癌组,差异均有统计学意义(U=-3.561,P=0.000;U=-3.108,P=0.002),多形性腺瘤组中E-cadherin阳性表达的样本数明显高于腺样囊性癌组,差异有统计学意义(U=-2.147,P=0.032).正常泪腺β-catenin细胞膜呈中度或强阳性表达,多形性腺瘤和腺样囊性癌中β-catenin的表达较正常泪腺组织表达阳性程度差异无统计学意义(P＞0.05),腺样囊性癌组中β-catenin细胞核阳性的比例(33.3%,2/6)较多形性腺瘤组(72.7%,7/11)低.结论 E-cadherin表达的下降是参与泪腺上皮性肿瘤发生及癌变的重要因素,而E-cadherin的进一步下降甚至缺失,以及β-catenin的核转位可能是参与泪腺多形性腺瘤恶性转化的因素之一。
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