Why is cancer so common?

by Kumar J. journalist

Cancer starts when cells in our bodies start to reproduce out of control, forming new, abnormal cells. These abnormal cells form lumps, known as tumours.

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Review on Why is cancer so common?

Cancer starts when cells in our bodies start to reproduce out of control, forming new, abnormal cells. These abnormal cells form lumps, known as tumours.

If the cells from tumours cannot spread, then the tumours are benign. They are not cancerous and can usually be removed.

If the cells are able to invade nearby healthy tissue and organs, or spread around the body through the blood or lymphatic system causing further tumours to grow, then the tumours are malignant or cancerous. These cancer cells are likely to spread if the tumour is not treated.

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