Explain how angiogenesis can contribute to cancer metastasis
After a period of time, cancer cells may start to produce chemicals that signal the body to grow a new network of blood and lymphatic vessels that serve to penetrate the tumor and help it grow. These new vessels deliver oxygen and nutrients to the growing tumor and carry away waste products. Normally, this process, called angiogenesis, is limited to situations such as wound healing or fetal development. During cancer, however, angiogenesis contributes to metastasis by allowing cancerous cells to break away from a malignant tumor and migrate to other parts of the body through the new blood and lymphatic vessels. There, they can cause a new cancer.
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