【摘要】 目的 研究胃癌表达胃泌素受体(gastrin receptor,GR)的特征及意义。 方法 应用受体的放射配基结合分析法测定34例胃癌标本GR含量及其亲和力,并比较胃癌表达的GR与其部位、分期、分级、胃癌细胞DNA含量、邻近正常胃粘膜的GR及患者生存期的关系。 结果 34例胃癌组织中,16例(47.1％)胃癌GR阳性,其中14例(41.2％)表达高亲和力GR,2例表达低亲和力GR;在高亲和力GR中,9例表达高含量GR(平均含量39.5±14.4 fmol/mg蛋白),5例表达低含量GR(平均含量6.0±2.8 fmol/mg蛋白)。胃体癌(77.8％)和贲门癌(50％)较胃窦癌(20.1％)更易于表达高亲和力GR。相同部位的胃癌及邻近正常粘膜表达GR是一致的,但胃癌表达的胃泌素受体含量(39.5±14.4 fmol/mg蛋白)高于粘膜(26.1±16.6 fmol/mg蛋白)。Ⅲ、Ⅳ期胃癌表达高亲和力GR的比例(13/24)明显高于Ⅰ、Ⅱ期胃癌(1/10)。胃癌表达的GR与癌细胞的分级无关。随访23～61月发现,对于Ⅲ、Ⅳ期胃癌患者,13例表达高亲和力GR的胃癌,有11例死亡;而11例低亲和力GR或GR阴性的胃癌,仅有4例死亡。 结论 GR在胃癌自分泌生长过程中也是一个重要的因素;GR有利于预测患者的预后及指导GR拮抗剂的应用。更多还原

【Abstract】 Objective: To investigate the characteristics and significance of gastrin receptor (GR) expression in gastric cancer. Methods: The content and affinity of GR were determined in 34 specimens of gastric cancer using radioligand binding assay. The correlation was analyzed between GR expression in tumors and tumor sites, stages, grades, DNA of gastric cancer cells, GR of adjacent normal gastric mucosa, survival time. Results: Among the 34 cases of gastric cancer, 16 patients (47.1%) had positive GR in specimens of gastric cancer, with high-affinity GR in 14 cases (41.2%) and low-affinity GR in 2 cases. Of high-affinity GR, 9 cases had cancers with GR>10 fmol/mg.protein (39.5-4-14.4 fmol/mg.protein), 5 cases with GR10 fmol/mg.protein (6.0±2.8 fmol/mg.protein). High-affinity GR was easier to be expressed in cancers of gastric body (7/9) and cardia (3/6) than in gastric antrum (4/19). The expression of GR in gastric cancer accorded well with that in normal gastric mucosa at the same sites, but with more high-special binding sites than the latter (39.5±14.4 vs 26.1±16.6 fmol/mg.protein). A significantly greater proportion of patients with Ⅲ+Ⅳ stages (13/24) had high-affinity GR compared with Ⅰ+Ⅱ stages (1/10) of gastric cancers. During a follow-up of 23 61 months, 11 of 13 cases with high-affinity GR were dead, whereas 4 of 11 cases with low-affinity or negative GR were dead in Ⅲ+Ⅳ stages of gastric cancer. Conclusion: GR is an important factor in the autocrine growth of gastric cancer cells, and helpful in the prediction of prognosis and guidance of treatment with GR antagonists.更多还原