How cancer starts: how a normal cell turns into cancer
Angiogenesis: how a tumour builds its own blood supply
A lump of cancer cells can stop growing at the size of a sesame seed and stay there. To get any bigger, it needs something your body normally saves for growing and healing, like a healing wound. What, and how does it ask?
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Every cell needs food and oxygen, and the blood brings them, through tiny blood vessels. A lump of cells that grow more than they should is called a tumour. Rono's was still tiny when Miva saw it. To grow big, a tumour must first solve a problem: food.
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Food and oxygen only travel a short way out of a blood vessel. As a tumour grows, the cells in its middle end up too far away.
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