25,000 New Zealanders are diagnosed with cancer every year, and as the population ages, that number is expected to increase.
There are various causes, notably genetic and environmental factors - of course the sun is a big one for us. But there is also another less well known factor, viruses. Viruses are estimated to be responsible for 1 in 5 cancers, with the two biggest culprits being HPV - Human papillomavirus - and Hepatitis B.
Dunedin born and Otago educated Gregory J. Morgan has mapped key breakthroughs in tumour virology over the last century in his book Cancer Virus Hunters: from early experiments with chickens through to the now ubiquitous HPV vaccine. He is an associate professor at the Stevens institute of Technology in New Jersey.