Angiogenesis plays an important role in the pathophysiology of both solid tumours and hematologic malignancies. Vascular endothelial growth factor (VEGF) is the most important pro-angiogenic factor involved in normal and pathologic angiogenesis and studies have also implicated VEGF in lymphomagenesis. Elevated VEGF gene expression correlates with diffuse large B cell lymphoma subtypes of poor prognosis on microarray analysis. In patients with lymphoma, high circulating serum VEGF levels have been strongly associated with poor clinical outcomes independent of other predictive factors.