ASPP家族在结肠癌组织中的表达及其临床意义

Expressions of ASPP family in colorectal carcinoma tissue and their clinical significances

目的:研究P53凋亡刺激蛋白(ASPP)家族在结肠癌组织中的表达,探讨其与结肠癌临床病理学特征的关系,阐明ASPP家族在结肠癌中的作用。方法:选取结肠癌组织45例、健康人正常结肠组织20例。45例结肠癌组织分为高分化组(11例)、中分化组(21例)和低分化组(13例);按TNM分期分为T1组(7例)、T2组(8例)、T3组(25例)和T4组(5例);有淋巴转移N1组(19例)和无淋巴转移N0组(26例)。应用免疫组织化学SP法检测结肠癌组织和正常结肠组织中的ASPP1、ASPP2和iASPP蛋白的表达,分析其与结肠癌的组织分化程度、浸润深度和淋巴结转移等临床病理学特征的相关性。结果:①ASPP家族成员在结肠癌组织和正常结肠组织中均有表达,结肠癌组织中ASPP1和ASPP2阳性表达率与正常结肠组织比较差异无统计学意义(P>0.05);结肠癌组织中iASPP阳性表达率高于正常结肠组织(P<0.01)。②结肠癌组织中ASPP1表达与肿瘤细胞的分化程度无相关性(rs=0.163,P>0.05);ASPP2阳性表达率随肿瘤细胞的分化程度的降低而递减,二者呈正相关关系(rs=0.454,P<0.01);结肠癌组织中iASPP的表达与肿瘤细胞的分化程度无相关性(rs=-0.171,P>0.05)。③结肠癌组织中ASPP1表达与肿瘤浸润深度无相关性(rs=-0.268,P>0.05);ASPP2的阳性表达率随肿瘤浸润程度增加而递减,二者呈负相关关系(rs=-0.348,P<0.05);结肠癌组织中iASPP的表达与肿瘤浸润深度无相关性(rs=0.231,P>0.05)。④结肠癌组织中ASPP1、ASPP2和iASPP的表达均与淋巴结转移无相关性(rs=0.089、rs=0.044和rs=0.210,P>0.05)。结论:iASPP在结肠癌组织和正常组织中表达水平不同,提示其有可能成为良恶性结肠疾病的诊断及鉴别指标;ASPP2与结肠癌病理分级和分期有相关性,可以成为结肠癌的预后指标。

Objective To investigate the expressions of apoptosis stimulating protein of P53 （ASPP）family in colorectal carcinoma tissue and to explore their relationship with the clinicopathological characteristics of colorectal carcinoma,and to clarify the effect of ASPP family in the development of colorectal carcinoma.Methods 45 cases of colorectal carcinoma tissue and 20 cases of healthy controls were selected. Among 45 cases of colorectal carcinoma tissue, there were 1 1 cases of well differentiated colorectal carcinoma, 2 1 cases of moderately differentiated colorectal carcinoma,and 13 cases of poorly differentiated colorectal carcinoma;7 cases of T1 stage colorectal carcinoma,8 cases of T2 stage colorectal carcinoma,25 cases of T3 stage colorectal carcinoma,and＆amp;nbsp;5 cases of T4 stage colorectal carcinoma;19 cases of N1 stage with lymph node metastasis,26 cases of N0 stage without lymph node metatasis.The expressions of ASPP1,ASPP2,and iASPP in 45 cases of colorectal carcinoma tissue and 20 cases of normal colon tissue were detected by immunohitochemistry SP method,and the correlations between the expressions of ASPP family and the pathologic typing,infiltrative depth,and lymph node metastasis of colorectal carcinoma were analyzed. Results ①The immunohitochemical staining results showed that the ASPP family members expressed in colorectal carcinoma tissue and normal colon tissue, and there were no significant differences in ASPP1 and ASPP2 positive rates between colorectal carcinoma tissue and normal colon tissue （P〉0.05）;the positive expression rate of iASPP in colon cancer tissue was higher than that in normal colon tissue （P〈0.01）.② The expression of ASPP1 in colon caner tissue had no correlation with the differentiation degree of tumor cells （rs=0.163,P〉0.05）;the expression of ASPP2 positive rate was decreased when the differentiation degree of tumor cells reduced,they had positive correlation （rs=0.454,P=0.002）;the expression of iASPP in colon cancer tissue had no correlation with the differentiation degree of tumor cells （rs=-0.171,P〉0.05）.③ The expression of ASPP1 in colon caner tissue had no correlation with the infiltrative depth of tumor （rs=-0.268,P〉0.05）;the expression of ASPP2 positive rate was decreased when the tumor infiltrative depth increased,they had negative correlation （rs=-0.348,P〈0.05）;the expression of iASPP in colonic carcinoma caner tissue had no correlation with the infiltrative depth of tumor （rs=0.231,P〉0.05）.④The expressions of ASPP1,ASPP2, and iASPP in colon caner tissue had no correlation with lymph node metastasis （rs=0.089,rs=0.044,rs=0.210, P〉0.05）.Conclusion The expression levels of iASPP in colon cancer and normal colon tissues are different,it may be useful for the diagnosis, differential diagnosis and evaluation in benign and malignant colorectal diseases. The expression of iASPP is negatively correlated with the pathologic typing and neoplasm staging of colorectal carcinoma,it indicates that iASPP can be used as a indicator in judging the prognosis of colorectal carcinoma.