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Vascular Endothelial Growth Factor Levels in Ovarian Cyst Fluid Correlate with Malignancy¹

Department of Pathology and Laboratory Medicine, MCP Hahnemann University, Philadelphia, Pennsylvania 19102 [D. H., R. F. N.], Department of Pathology and Laboratory Medicine, University of South Florida, and H. Lee Moffitt Cancer Center, Tampa, Florida 33612 [S. V. N.]

Ovarian cancer is a richly vascularized neoplasm with solid and cystic components. The purpose of this study was to determine whether cyst fluid could be used to quantitatively evaluate production of angiogenic factors in ovarian lesions. ELISA was used to measure vascular endothelial growth factor (VEGF) and basic fibroblast growth factor (bFGF) in the cyst fluid of patients with ovarian cancer (n = 13), benign cysts and cystadenomas (n = 23), borderline tumors (n = 5), and functional cysts (n = 8). VEGF levels were markedly elevated in the fluid of malignant cysts (38.5 ± 8.2 ng/ml) as compared with benign (1.6 ± 0.4 ng/ml; P < 0.001), borderline (5.7 ± 1.5 ng/ml; P < 0.001), or functional cysts (3.8 ± 2.0 ng/ml; P < 0.001). The presence of VEGF in cancer cells was confirmed by immunohistochemistry. Follow-up of patients with malignant and borderline lesions demonstrated a correlation between VEGF levels in cyst fluid and tumor recurrence (P = 0.03). bFGF in malignant cysts was either undetectable or very low (0.3 ± 0.2 ng/ml), and no significant differences were found in bFGF levels among malignant, benign, borderline, and functional cysts. This study demonstrates that ovarian malignancy is associated with dramatic elevation of VEGF levels in ovarian cyst fluid. Conversely, there is no correlation between cyst fluid bFGF levels and malignant transformation. The high levels of VEGF in malignant cysts are consistent with the hypothesis that this growth factor plays an important role in ovarian cancer related-angiogenesis and tumor progression and represents a potentially important target of antiangiogenic therapy.

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