维甲酸β受体在结直肠癌组织中的表达及其意义

目的 探讨维甲酸β受体(RAR-β)在结直肠癌组织中的表达及其意义.方法 应用免疫组化法检测2006年1月至2007年1月收治的60例结直肠癌患者肿瘤组织、癌旁组织及正常组织标本中RAR-β的表达,采用化学发光免疫法检测该60例患者术前血清癌胚抗原(CEA)水平,结合其临床病理资料,分析人结直肠癌组织中RAR-β的表达情况及其意义.结果 60例结直肠癌患者的肿瘤组织中RAR-β阳性表达率(48%)显著低于正常组织(87%)及癌旁组织(87%)(P<0.05).有淋巴结转移患者的肿瘤组织中RAR-B阳性表达率(32%)显著低于无淋巴结转移患者的肿瘤组织(60.0%),且晚期肿瘤患者(TNM Ⅲ、Ⅳ期)的RAR-β阳性表达率(29%)显著低于早期肿瘤患者(Ⅰ、Ⅱ期)(69%)(P均<0.05).RAR-β阳性表达率在高、中、低分化肿瘤组织中无明显差异.本组患者中,CEA水平升高者20例,正常者40例,有淋巴结转移及晚期肿瘤患者中CEA水平升高者(48%、52%)分别高于无淋巴结转移及早期肿瘤患者(23%、14%)(P均<0.05).结论 RAR-β在结直肠癌组织中表达下调,这可能与结肠癌发生相关,且其表达下降程度与淋巴结转移情况及TNM分期呈明显负相关,与CEA类似,其表达可作为结直肠癌的预后指标.

Expression and its significance of retinoic acid receptor-beta in colorectal cancer

Objective To investigate the expression and its significance of retinoic acid receptor-beta (RAR-β) in colorectal cancer. Methods RAR-β was detected by immunohistochemistry methods and carcino-embryonic antigen (CEA) was tested by chemiluminescence immunoassay methods in normal tissues, paracancerous tissues and colorectal cancer tissues of 60 patients with colorectal cancer treated from January 2006 to January 2007. Above-mentioned data, together with the clinicopathological data of these 60 patients, were analyzed to figure out the expression and its significance of RAR-βin colorectal cancer. Results The expression rate of RAR-p in tumor tissues (48% ) was significantly lower than those in both normal tissues (87% ) and paracancerous tissues ( 87% ) ( P < 0. 05 ) . And its expression was also significant lower in patients with lymph node metastasis (32% ) and patients with advanced cancer ( TNM stage Ⅲ and IV) (29% ) than in those without lymph nodes metastasis (60% ) and those with early stage cancer (stage Ⅰ and Ⅱ )(69% ) . There was no significant differences among well, mildly and poorly differentiated cancer tissues. The CEA level rose in 20 patients, and its rising rate was remarkably higher in patients with lymph node metastasis (48% ) and in patients with advanced cancer (52% )than those without lymph node metastasis (23% ) and in early stage ( 14% ) . Conclusions The expression of RAR-β decreases significantly in cancer tissues in patients with colorectal cancer, which may be related to the carcinogenesis of colorectal cancer; and its decreasing degree is correlated negatively with the lymph node metastasis and advanced clinicopathological stage. The expression level of RAR-βmay be a new prognostic indication of patients with colorectal cancer.