how cancer grows
Without a blood supply, a tumour can't grow much bigger than a pin head. Once a cancer can stimulate blood vessel growth, it can grow bigger and grow more quickly. It will stimulate the growth of hundreds of new capillaries from the nearby blood vessels to bring it nutrients and oxygen.View a transcript of the video about how cancer gets a blood supply.t can also grow directly into body structures nearby. This is called local invasion. How a cancer actually grows into surrounding normal body tissues is not fully understood. A cancer may just grow out in a random direction from the place where it started.