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目的:分析结肠腺癌组织中DNA结合/分化抑制蛋白2(inhibitor of DNA binding2，ID-2)与细胞增殖的关系。方法:收集2014年11月至2015年9月华北理工大学附属医院确诊的67例结肠腺癌患者临床资料进行回顾性分析，均行根治术，以肿瘤组织作为观察组，以距肿物边缘>3 cm处的正常结肠黏膜组织作为对照组。应用免疫组化法检测两组标本组织中ID-2及癌组织中Ki67的表达。构建过表达ID-2结肠癌SW480细胞系，应用Western Blot法检测增殖细胞核抗原(proliferating cell nuclear antigen，PCNA)的表达，应用CCK-8法检测细胞活性。应用pearson相关分析分析ID-2和Ki67的相关性，应用Kaplan-Meier生存分析和Log-rank检验分析ID-2的表达对判断结肠腺癌预后的价值。结果:观察组患者ID-2的阳性率49.3%(33/67)，高于对照组的9.0%(6/67)，两组比较差异有统计学意义(χn 2＝23.927，n P<0.05)。观察组患者癌组织中ID-2的表达在不同浸润深度[浆膜及以外为68.7%(22/32)，未及浆膜为31.4%(11/35)]、分化程度[低分化为80.0%(8/10)，中分化为57.9%(11/19)，高分化为36.8%(14/38)]、临床分期[Ⅲ、Ⅳ期为64.3%(18/28)，Ⅰ、Ⅱ期为38.5%(15/39)]及有无淋巴结转移[有为70.8%(17/24)，无为37.2%(16/43)]、癌栓[有为75.0%(12/16)，无为41.2%(21/51)]比较差别均有统计学意义(χn 2值分别为6.311、4.023、4.349、6.967、5.575，n P均<0.05)。ID-2与Ki67呈正相关性(n r＝0.65，n P<0.05)。生存分析显示结肠腺癌中ID-2的表达与患者的预后有关(χn 2＝5.29，n P＝0.013)。相对于空载体转染组和空白对照组，过表达ID-2结肠癌细胞中PCNA表达升高(n P<0.05)，细胞活性升高(n P3 cm from the edge of the tumor was taken as the control group.Immunohistochemistry was used to detect the expression of ID-2 of the two groups and the Ki67 of cancer tissue.SW480 cell line of ID-2 overexpression was constructed.The expression of proliferating cell nuclear antigen(PCNA)was detected by Western Blot.Cell activity was detected by CCK-8 test.Correlation was analyzed between ID-2 and Ki67 by pearman correlation analysis.Prognostic value of ID-2 was analyzed by Kaplan-Meier survival analysis and Log-rank test in colorectal adenocarcinoma.Results:The positive rate of ID-2 was 49.3%(33/67) in the observation group, which was higher than 9.0%(6/67) in the control group, and the difference between the two groups was was statistically significant(χn 2=23.927, n P<0.05). In the observation group, the expression of ID-2 was statistically significant in different invasion depth(serosa and extraserosa was 68.7%(22/32), serosa and extraserosa was 31.4%(11/35)), degree of differentiation(low differentiation was 80.0%(8/10), medium differentiation was 57.9%(11/19), high differentiation was 36.8%(14/38)), clinical stage(Ⅲ and Ⅳ stage were 64.3%(18/28), Ⅰ and Ⅱ stage were 38.5%(15/39)), lymph node metastasis(metastasis was 70.8%(17/24), no metastasis was 37.2%(16/43)) and tumor thrombus(yes was 75.0%(12/16), no was 41.2%(21/51)). The difference was statistically significant (χn 2 value were 6.311, 4.023, 4.349, 6.967 and 5.575, respectively, all n P<0.05). Positive correlation was found between ID-2 and Ki67(n r=0.65, n P<0.05). Survival analysis showed that the expression of ID-2 was related to the prognosis of patients (X2=5.29,n P=0.013). Compared with empty vector transfection group and blank control group, the expressions of PCNA and the activity ID-2 overexpression colon cancer cells increased(n P<0.05).n Conclusion:The higher expression of ID-2 is related to clinicopathological features and prognosis in colorectal adenocarcinoma.The abnormal expression of ID-2 may play a role in regulating the proliferation of colon adenocarcinoma.