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Asked by sharline1 to Peter, Jonathan, Grace, Doris, David, Ann on 5 Jun 2019.
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Grace Kago answered on 5 Jun 2019:
when cells in the brain grow without stopping. Usually the regulators that tell the cells to stop are not functioning, so the cells just divide and divide and divide, causing a tumor.
Source: https://www.webmd.com/cancer/brain-cancer/qa/what-is-a-tumor
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