ABSTRACT
          Colorectal cancer remains a leading cause of morbidity and mortality worldwide. Most colorectal cancers begin as a growth of tissue called a polyp, some types of which can change into cancer over the course of several years. Angiogenesis, the formation of new blood vessels, is known to play a key role in the initiation, growth and progression of polyp and colorectal cancer. In this review, we discuss the mechanisms involved in colorectal cancer and polyp angiogenesis.