Final answer:
Angiogenesis is the process of forming new blood vessels, often exploited by cancers to grow and metastasize. Angiogenesis inhibitors are used in cancer treatment to disrupt the blood supply to tumors and inhibit further spreading of the cancer cells.
Step-by-step explanation:
The formation of new blood vessels due to the secretion of factors by cancer is called angiogenesis. This process is critical for tumor growth, as all tissues, including malignant tumors, require a blood supply to receive nutrients and oxygen. Cancer treatments may utilize angiogenesis inhibitors to prevent the formation of these new blood vessels, thereby starving the tumor and inhibiting its growth and ability to metastasize, which is the process where cancer cells travel from the primary tumor through the bloodstream to form new cancers at distant sites.