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  • How does cancer start? - Cancer Research UK
    If any of these signals are faulty or missing, cells might start to grow and multiply too much and form a lump called a tumour A primary tumour is where the cancer starts Some types of cancer start from blood cells These are called blood cancers, such as leukaemia They don't form solid tumours
  • What Is Cancer? - NCI
    When cells grow old or become damaged, they die, and new cells take their place Sometimes this orderly process breaks down, and abnormal or damaged cells grow and multiply when they shouldn’t These cells may form tumors, which are lumps of tissue Tumors can be cancerous or not cancerous (benign)
  • How cancer starts, grows and spreads - Canadian Cancer Society
    As cancer cells divide, a tumour will develop and grow Cancer cells have the same needs as normal cells They need a blood supply to bring oxygen and nutrients to grow and survive When a tumour is very small, it can easily grow, and it gets oxygen and nutrients from nearby blood vessels
  • How Does a Cancer Start? Causes, Risk Factors, Types
    Cancer starts when the body’s normal control mechanism stops working and old cells grow out of control, forming new, abnormal cells, instead of dying These new abnormal cells can form a mass of tissue called a tumor
  • How Does Cancer Start? Genes and Cancer | American Cancer Society
    Cancer begins when some of the genes in a cell become abnormal, causing the cell to grow and divide out of control Here you can learn more about how changes in a cell's genes can lead to cancer
  • How Does Cancer Start, According To Science? - MSN
    Cancer begins when a single cell has six different kinds of mutations that can cause the cell to behave abnormally, such as dividing out of control
  • Development and Spread of Cancer - The Merck Manuals
    When cells with flaws in their genes are exposed to a carcinogen, they're more likely to turn into cancer This is why a certain kind of cancer might run in your family
  • What Is Cancer? Symptoms, Causes Types - Cleveland Clinic
    Cancer is when abnormal cells grow out of control and spread to other areas of your body It can start almost anywhere, including skin, organs, bones and blood





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