Juvenile nasopharyngeal angiofibroma (JNA) is a rare, histologically benign neoplasm of the nasopharynx that affects mostly boys and young men. A common feature of these tumors is their strong vascularity. However, the pathogenesis of JNA remains unclear. A role for androgens in JNA has been proposed but not proven.
1-5 Another influence might be the expression of angiogenic growth factors by the tumor that leads to vessel growth and subsequent tumor proliferation. This hypothesis is supported by a study conducted by Schiff and colleagues
6 in 1992 that documented immunolocalization of basic fibroblast growth factor, a strong proangiogenic cytokine, in the vessel endothelium of JNA. In another study performed by Nagai and colleagues
7 using a polymerase chain reaction approach, the messages for several proangiogenic cytokines were detected, but the expressing cells were not defined because of inherent limitations of the technique used. Recently, Dillard and colleagues
8 reported the expression of transforming growth factor β1 in JNA stroma and endothelial cells. However, these studies do not address the type and localization of growth factor–expressing cells and the potential correlation with vessel density and tumor proliferation. Moreover, the most prominent proangiogenic growth factor in tumor biology—vascular endothelial growth factor (VEGF)—has not as yet been analyzed.