淋巴结微转移及相关蛋白检测在大肠癌患者Dukes分期、治疗和预后中的意义

目的 探讨淋巴结微转移（LNMM）和nm23-H1、基质金属蛋白酶9（MMP9）、金属蛋白酶2组织抑制因子（TIMP2）蛋白检测及其相关性在大肠癌患者Dukes分期、治疗和预后中的意义。方法 应用免疫组化SABC法检测30例DukesB期大肠癌淋巴结细胞角蛋白20（CK20）和癌组织nm23-H1、MMP9、TIMP2蛋白表达,另对同期30例DukesC和D期大肠癌患者检测nm23-H1、MMP9和TIMP2;随访、记录患者的临床病理参数和生存资料,分析其相关性。结果 （1）26．7％DukesB期大肠癌患者、7．8％DukesB期大肠癌淋巴结存在CK20阳性。（2）DukesB期大肠癌nm23-H1、MMP9表达与DukesC和D期差异显著（P〈0．05）;nm23-H,表达下降和（或）MMP9表达增强与LNMM相关（P〈0．05）,两者预测大肠癌LNMM敏感性和特异性分别为62．5％和81．8％、75．0％和69．8％,联合检测特异性则达90．9％;而TIMP2与Dukes分期、LNMM无关。（3）DukesB期LNMM（＋）患者癌复发转移率明显高于同期LNMM（-）组（P〈0．05）,而生存率则降低（P〈0．05）;nm23-H1（-）LNMM（＋）、MMP9（＋）LNMM（＋）患者生存期明显短于nm23-H1（＋）LNMM（-）、MMPq（＋）LNMM（-）组（P〈0．05）。结论 CK20免疫组化可检出大肠癌LNMM;DukesB期大肠癌nm23-H1、MMP9表达与LNMM相关,且表达异常LNMM患者预后差;联合检测淋巴结CK20和癌组织rim23-H1、MMP9表达,对大肠癌Dukes分期、术后辅助化疗和预后判断有重要意义。

Lymph node micrometastases and expression of metastasis-related gene proteins in patients with colorectal cancer

OBJECTIVE: To study lymph node micrometastases (LNMM), expression of nm23-H(1), MMP(9), TIMP(2) proteins, and their relationship and clinical significance in patients with stage Dukes B colorectal cancer. METHODS: Thirty patients with stage Dukes B colorectal cancer were studied. LNMM in these patients was detected by immunohistochemical anti-cytokeratin 20 (CK20) staining. The expression of nm23-H(1), MMP(9) and TIMP(2) proteins in primary tumors was examined by Strept-avidin-biotin complex method. Clinical-pathological data and survival of each patient were recorded and analyzed. RESULTS: (1) The positive dyeing of CK20 was observed in 26.7% for cases and in 7.8% for lymph nodes of 30 patients with stage Dukes B colorectal cancer. (2) Different expression of nm23-H(1) and MMP(9) proteins in the patients between stage Dukes B and stage Dukes CD was observed (P < 0.05). The decreased nm23-H(1) expression, and/or the increased MMP(9) expression in primary stage Dukes B tumors were significantly associated with LNMM (P < 0.05). Sensitivity and specificity for detection of LNMM by using nm23-H(1) or MMP(9) were respectively 62.5% and 81.8% or 75.0% and 69.8%. If by combining nm23-H(1) with MMP(9), specificity for detection of LNMM became 90.9%. The expression of TIMP(2) protein was not related with stage Dukes and LNMM. (3) The percent of tumor recurrence and/or metastasis for the stage Dukes B patients with LNMM was significantly higher than that for the patients without LNMM (P < 0.05), but the survival percent for the patients with LNMM was significantly lower than that for the patients without LNMM. The outcome for the patients with nm23-H(1) (-) LNMM (+) or MMP(9) (+) LNMM (+) was significantly worse than that for patients with nm23-H(1) (+) LNMM (-) or MMP(9) (+) LNMM (-) (P < 0.05). CONCLUSIONS: LNMM is detected by immunohistochemical anti-CK20 staining. The expression of nm23-H(1) and MMP(9) in primary stage Dukes B tumors was significantly associated with LNMM. The outcome in the LNMM patients with nm23-H(1) (-) and/or MMP(9) (+) were worse. Combining examination of CK20 for lymph nodes with expression of nm23-H(1) and MMP(9) for primary tumors is of important clinical significance for staging of Dukes, selection of adjuvant treatment and evaluation of prognosis in patients with colorectal cancer.