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[C or U] a serious disease that is caused when cells in the body grow in a way that is uncontrolled and not normal, killing normal cells and often causing deathHe died of liver cancer.
cancer of the cervix/stomach
breast/bowel/lung cancer
cancer cells
a cancer patient
It was a secondary cancer.
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[C] a harmful activity that spreads quicklyDrug abuse is a cancer which is destroying our society.
a cancerous growth/tumour