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Bevacizumab works by blocking a protein called VEGF, which some cancer cells produce in large amounts. Blocking VEGF may prevent the growth of new blood vessels that tumors need to grow. Bevacizumab is a type of targeted therapy called an angiogenesis inhibitor. For cancer, it is given by slow injection into a vein （intravenous） and used for colon cancer, lung cancer, glioblastoma, and renal-cell carcinoma. In many of these diseases it is used as a first-line therapy. For age-related macular degeneration it is given by injection into the eye （intravitreal）.