Radiation – radiation that are high in energy can damage the bonds in DNA- this leads to mutations, ultraviolent radiation can cause skin cancer.
Carcinogens – carcinogens cause changes in DNA, DNA can be repaired by cells – it often takes lots of carcinogens before cancer is triggered. Carcinogens in cigarettes causes cancer, carcinogens in alcohol can cause cancer.
Ageing – older people have been exposed to more factor that cause cancers, they have also more time to accumulate damage DNA.
Heredity – some people inherit genes which make them more likely to develop cancer.
Viruses – some viruses cause cancer, viruses infect cells by inserting new genetic materials into cells – cause changes in cell’s DNA.
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