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[To young children] Cancer is when bad cells – or trouble-maker cells – stop good cells from doing their job. The bad cells can grow into a lump or can cause problems in the blood. They can spread around the body too. Cancer is the name for more than 100 diseases in which abnormal cells grow out of control. This causes problems in the blood, or lumps – called tumours – to grow. Cancer can spread to other parts of the body. [Word] 
Cancer
Cancer glossary for children | Cancer Council NSW
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