Furthermore, WT1 has been shown to induce a number of other factors [72–75] that can promote tumorigenesis and angiogenesis and have been shown to be expressed by KS spindle cells or KSHV infected endothelial cells in culture, including BCL2, MMP9, VEGF and PDGF receptors [76–80]. This evidence concerns the gene WT1 and Kaposi's sarcoma.