cancer is a disease characterized by the uncontrollable growth of abnormal or damaged cells in the body. any cell in the body can become cancerous because the process of cell division and multiplication.
cells in the body are continuously growing and multiplying to help form new cells. if a cell becomes old or damaged, it dies off, and the newly grown cells take its place. if that process does not occur as it should, the damaged cells grow and multiply instead, leading to the growth of cancer and tumours in the body.
cancer is considered a genetic disease because it is driven by gene changes that control the function of cells. these genetic changes occur because of errors in cell division, damage to dna, or because they were inherited from parents.
there are more than 100 types of cancer, each classified by the organs or tissues they form. they can also be classified based on the cells that formed them.
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