A malignant tumour is a lump or growth of cells that can be harmful and spread to different parts of the body. These cells grow uncontrollably and can invade nearby tissues or travel through the blood or lymphatic system to form secondary tumours in other areas. Malignant tumours are referred to as cancer. Unlike benign tumours, which do not spread, malignant tumours can damage normal body functions and become life-threatening, so they must be treated. Treatment may include surgery, chemotherapy, or radiotherapy to remove or destroy the cancerous cells.
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