Manufactured by Genentech Inc., Avastin (bevacizumab) is an anti-angiogenesis drug that has been approved by the Food and Drug Administration (FDA) to treat metastatic colorectal cancer. Avastin is used in combination with other forms of treatment such as chemotherapy. In a clinical trial, a handful of patients diagnosed with metastatic colorectal cancer were given Avastin in addition to chemotherapy, while the rest of the group was given only chemotherapy. The study found that the tumors of patients who took Avastin in addition to chemotherapy shrank in size and were kept from growing more often than in patients who received only chemotherapy. Those who took Avastin in conjunction with chemotherapy lived longer than patients who received only chemotherapy.