Bevacizumab, a humanized monoclonal antibody, specifically binds to all VEGF-A isoforms with high affinity, and inhibits its interaction with VEGFR-1 and VEGFR-2. Experimental analysis shows that the EC50 of Bevacizumab to bind VEGF analyzed by ELISA is 0.18 μg/mL. Binding kinetics assays show similar results that Bevacizumab inhibits the VEGF-induced proliferation of HUVEC with an IC50 value of 0.047±0.0081 μg/mL.