What is cancer and how does it start? Cancer Research UK (2021)

In this video we explain what cancer is and how it starts. Cancer begins in our cells. It happens when something goes wrong when cells are dividing. We explain how a tumour can develop and what might cause it. Visit our website: https://www.cancerresearchuk.org/abou...​ for more information about what how cancer develops. For information about causes: https://www.cancerresearchuk.org/abou...​
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