How Targeted Therapy Avastin (Bevacizumab) Treats Metastatic Cancer Targeted cancer therapy Avastin (Bevacizumab) is an FDA approved cancer treatment for various types of metastatic cancers, such as colon cancer and lung cancer. In this video, medical oncologist Dr. Stephen Lemon describes how this treatment works, as well as what types of side effects it may cause. Visit to watch more educational videos on cancer. Avastin is developed by Genentech. Dr. Lemon is a medical oncologist and is not affiliated with Genentech.