Expression of apolipoprotein A-I in eight histological types of renal neoplasms]

To investigate the expression of apolipoprotein A-I(ApoA-I) in eight histological types of renal neoplasms and to explore a new biomarker for differential diagnosis.The immunochemistry was used to detect the expression of ApoA-I in 23 cases of renal tumors, including clear cell carcinoma,papillary cell carcinoma, chromophobe cell carcinoma, oncocytoma,multilocular cystic carcinoma, renal pelvis invasive urothelial carcinoma,metanephric adenoma and collecting ducts carcinoma. Five cases of cancer-adjacent normal tissues were obtained from another five renal tumor patients and were chosen as control group.In the 23 cases of renal tumors, ApoA-I was expressed in 21 cases (positive rate was 91.3%). There were only two in five cases of normal tissues which expressed this protein (positive rate was 40.0%). A significant differentiation was observed between the two groups(Z=-2.829,P=0.003). In renal clear cell carcinoma (RCC), ApoA-I expression level was correlated with the grade and stage of tumor tissues. ApoA-I was stained much more stronger in RCC II-III than in RCC I (Z=-2.070,P=0.038).In various histological types of renal cancer, ApoA-I was all expressed to some degrees.ApoA-I can be chosen as a tumor biomarker to differentiate various histological types of renal neoplasms.