Cancer

• Cancer is the result of changes in cells that lead to uncontrolled growth and division
• Benign tumours are growths of abnormal cells which are contained in one area, usually within a membrane and they do not invade other parts of the body
• Malignant tumour cells are cancers and they invade neighbouring tissues and spread to different parts of the body in the blood where they form secondary tumours
• Scientists have identified lifestyle risk factors for various types of cancer and there are also genetic risk factors for some cancers
• Smoking causes lung cancer
• UV exposure can lead to skin cancer