It was long believed that sharks do not get cancer. This has fuelled damaging beliefs that sharks could in fact cure people of the disease. We now kill around 100 million sharks every year. The reality is that sharks DO get cancer.
Recently, researchers in Australia noticed a large tumour protruding from the mouth of a great white shark, as well as another mass on the head of a bronze whaler shark. There have now been documented cases of tumours in 23 different shark species.
It is still unknown what caused the tumours in the great white or bronzer shark. However, reports of cancerous tumours in marine animals, especially mammals, have steadily increased over the past 20 years, raising concerns that industrial pollutants or human activities may trigger the cancers.http://www.livescience.com/41655-great-white-shark-cancer.html
Image credit: Andrew Fox and Sam Cahir