Humans have a "tumour suppressor gene" called p53 which helps reduce the occurrence of cancers. Elephants (not quite whale size, but still pretty big!) have bee

Humans have a "tumour suppressor gene" called p53 which helps reduce the occurrence of cancers. Elephants (not quite whale size, but still pretty big!) have been shown to simultaneously express 20 variants of p53 which is thought to (at least partially) account for the lack of an expected increase in incidences of tumours given their sheer number of cells. Further reading: http://www.nature.com/news/how-elephants-avoid-cancer-1.18534 http://www.nature.com/news/how-elephants-avoid-cancer-1.1853...