Functions of aminopeptidase N in breast cancer angiogenesis and its correlation with VEGF
CAO Wen-qing
; NING Dian-bin; FENG Li; ZHAO Yu-zhe; ZHANG Jing(Department of The First General Surgery, Hebei General Hospital, Shijiazhuang 050051,China)
Objective: To investigate the expression and significance of aminopeptidase N (APN) in breast cancer, meanwhile, to explore the relationship between APN and vascular endothelial growth factor (VEGF), and to discuss the functions of APN in angiogenesis of breast cancer. Methods: Immunohistochemistry (SP means) was performed to measure the expression of APN in 60 cases of breast cancer tissues and 20 cases of adjacent normal breast tissues. Results: APN mainly was expressed in the membrane of malignant cells, and the positive rate of APN expression in breast cancer tissues was higher than that in adjacent normal breast tissues, 36.7% (22 out of 60) and 0% (0 out of 20) respectively (χ2=10.115, P=0.001). APN expression was associated with tumor pathological type (P=0.035). Furthermore , APN expression in neovascular endothelium was also observed in breast cancer tissues while no expression was found in normal endothelium. Under the correlation analysis, no linear correlation was found between the APN expression and VEGF expression (rs =0.078, P =0.553). However, The APN positive rates in VEGF positive group and in VEGF negative group were 44.7%(21 out of 47),7.7%(1 out of 13)respectively, showing the APN expression was more often observed in VEGF positive group than in VEGF negative group (χ2=4.512, P=0.034). Conclusion: A synergistic effect may exist between APN and VEGF in the function of tumor angiogenesis in breast cancer, and the expression of APN in breast cancer may indicates a poor prognosis. APN could function as an effective target in anti-cancer therapy.
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