Expression of the angopoietin-1, angopoietin-2, Tie2, and vascular endothelial growth factor gene in epithelial ovarian cancer

Abstract

Objective. Angiopoietin/Tie2 system with vascular endothelial growth factor (VEFG) is known to be important for the initiation of angiogenesis in tumors. The aim was to evaluate whether angiopoietin/Tie2 system with VEFG affects prognosis in patients of epithelial ovarian cancer. Methods. Angiopoietin-1 ( Ang-1), Angiopoietin-2 ( Ang-2), Tie2, and VEGF gene expression were analyzed by real-time quantitative reverse transcription-polymerase chain reaction (RT-PCR) in 85 epithelial ovarian cancer surgical specimens. These gene expressions were correlated with clinical–pathological parameters, microvessel density (MVD), and patients' survival. Results. Ang-1/Ang-2 gene expression ratio, VEGF, and Tie2 gene expression significantly associated with MVD, respectively ( P < 0.0001, P = 0.024, P = 0.005). The patients with low Ang-1/Ang-2 gene expression ratio and high VEGF gene expression were found to have a significantly higher MVD when compared to others ( P = 0.0003). Moreover, there was a significant difference between the values of MVD in patients with low Ang-1/Ang-2 gene expression ratio and high VEGF and high Tie2 gene expression and those in others ( P = 0.0025). FIGO stage ( P = 0.014), residual disease ( P = 0.042), histological grade ( P = 0.028), Ang-1/Ang-2 gene expression ratio ( P = 0.010), and combination of Ang-1/Ang-2 gene expression ratio and VEGF gene expression ( P = 0.019), were found to be significantly associated with a poor prognosis in univariate Cox regression analysis. Multivariate Cox regression analysis revealed that FIGO stage is an independent prognostic factor ( P = 0.035). Low Ang-1/Ang-2 gene expression ratio had a tendency to be an independent prognostic factor ( P = 0.061). Conclusion. Angiogenesis occurred by angiopoietin/Tie2 system in concert with VEGF in epithelial ovarian cancer did not affect patients' survival. However, gene expression of Ang-1 and Ang-2 might present a pertinent diagnostic tool to select a high-risk group of patients independent of clinical–pathological parameters and a new insight to understand the biology of epithelial ovarian cancer.