A method of modulating, regulating and/or stabilizing angiogenesis in a mammal in need thereof, in which the PDGF-D level or activity or both in the mammal are modulated or increased. In preferred embodiments, an active PDGF-D polypeptide, or a polynucleotide encoding an active PDGF-D is administered to the mammal, preferably at a location where angiogenesis modulation or stabilization is desired. The PDGF-D is advantageously co-administered with an angiogenic growth factor, such as a member of the VEGF family of growth factors, in particular VEGF-E. The claimed method inhibits leakage of blood vessels and is useful, inter alia, for treatment of edemas.