A report by World Health Organization (WHO) scientists estimates 37% of cancers are caused by infections, lifestyle choices and environmental pollutants that could be avoided.
This includes cervical cancers caused by human papilloma virus (HPV) infections which vaccination can help prevent, as well as a host of tumours caused by tobacco smoke from cigarettes.
The International Agency for Research on Cancer, part of the WHO, analysed 30 preventable factors known to increase the risk of cancer.
These include smoking and ultraviolet (UV) radiation which can directly damage our DNA; obesity and too little physical activity which alter inflammation and hormones in the body to raise cancer risk; and air pollution which can wake up dormant cancer cells.
The big three contributors to more than 18 million cancer cases around the world were found to be:
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