* Benign and maligant tumours result from abnormal, uncontrolled cell division.
* Bengin tumours form in one place and dont spread to other tissues.
* Malignant tumours are cancers. The cancerous cells invade neigbouring tissues and many spread in the blood to different parts of the body where they form secondary tumours.
* Lifestyle risk factors for various types of cancer include smoking, obesity, common viruses, and UV exposure. There's also genetic risk factors for some cancers.
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