New insights into the functions and localization of the homeotic gene CDX2 in gastric cancer

Gastric cancer is one of the most frequent cancers,and it ranks the third most common cancer in China.The most recently caudal-related homeobox transcription factor 2(CDX2)is expressed in a large number of human gastrointestinal cancers.In addition,gastric epithelial cell mutations in CDX2 result in tumor promotion,which is characterized by cellular drug resistance and a high proclivity for developing cancer.A series of publications over the past years suggests a mechanism by which CDX2 overexpression results in multidrug resistance.CDX2 appears to forward control regenerating Ⅳand the multidrug resistance 1 expression signaling pathway for regulation of cell drug resistance.

幽门螺杆菌感染和尾型同源盒转录因子2、黏蛋白2表达与胃癌的关系

目的研究幽门螺杆菌（Hp）感染、尾型同源盒转录因子2（CDX2）、黏蛋白2（MUC2）表达与胃癌的关系及检测CDX2、MUC2对判断胃癌预后的意义。方法90例胃癌标本，应用Warthin—starry硝酸银染色检测Hp及免疫组织化学SP法检测CDX2、MUC2蛋白表达，并以10例正常胃黏膜作为对照。结果正常胃黏膜内未检测到Hp，CDX2、MUC2蛋白不表达。Hp及CDX2、MUC2蛋自在肠型胃癌患者中的阳性率分别为67．86％（38／56）、75．00％（42／56）、66．07％（37／56），显著高于弥漫型胃癌患者[35．29％（12／34）、41．18％（14／34）、38．24％（13／34）]（P〈0．01或〈O．05）；在肠型胃癌患者中，CDX2、MUC2蛋自在Hp阳性患者阳性率明显高于Hp阴性患者（P〈0．01或〈0．05）。在弥漫型胃癌患者中，CDX2蛋白在Hp阳性患者阳性率也显著高于Hp阴性患者（P〈0．05）；CDX2、MUC2蛋白在早期、无淋巴结转移患者阳性率显著高于中晚期、有淋巴结转移患者（P〈0．01或〈0．05）；CDX2蛋白在I～Ⅱ期患者的阳性率也显著高于Ⅲ～Ⅳ期患者（P〈0．05）。结论Hp感染及CDX2、MUC2蛋白异常表达与胃癌的发生有关，与肠型胃癌关系密切；CDX2、MUC2蛋白可能对胃癌的浸润和转移有抑制作用。