GUNILLA ELAM / SCIENCE PHOTO LIBRARY GUNILLA ELAM / SCIENCE PHOTO LIBRARY
Tumour with a blood supply. Illustration showing a malignant (cancerous) tumour with a blood supply. Tumours need a blood supply to provide the oxygen and nutrients they require in order to grow beyond a certain size. The cells in a small tumour release angiogenic growth factor proteins that encourage the growth of new blood vessels from existing ones, a process known as angiogenesis. These blood vessels promote the tumour's transformation from benign to malignant cancer, allowing it to grow and spread.
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