Disclosed is an in vitro method of determining susceptibility of a patient to developing hypertension associated with a therapy comprising an angiogenesis inhibitor comprising bevacizumab or an antibody that binds essentially the same epitope on VEGF as bevacizumab, said method comprising: (a) determining in a sample derived from a patient suffering from cancer the genotype at polymorphism rs4444903 (SEQ ID NO. 4), and (b) identifying a patient as more or less susceptible to developing hypertension associated with a therapy by an angiogenesis inhibitor comprising bevacizumab or an antibody that binds essentially the same epitope on VEGF as bevacizumab based on said genotype, wherein the presence of GA genotype at polymorphism rs rs4444903 (SEQ ID NO. 4) indicates that said patient is more susceptible to developing hypertension than a patient having a genotype of GG or AA at polymorphism rs4444903 (SEQ ID NO. 4), or the presence of GG or AA genotype at polymorphism rs4444903 (SEQ ID NO. 4) indicates that said patient is less susceptible to developing hypertension than a patient having a genotype of GA at polymorphism rs4444903 (SEQ ID NO. 4).
