For a relatively long time I believed, that sharks do not develope cancer.
Today, by a chance I found this Wikipedia page about sharks:
http://en.wikipedia.org/wiki/Shark
It climed, that the concept, that sharks do not have a cancer is a misconception.
Here is the citing, that got my attention:
"
Popular misconceptions
A popular myth is that sharks are immune to disease and cancer, but this is not scientifically supported. Sharks have been known to get cancer.[87][88]
....
87.Finkelstein JB (2005). "Sharks do get cancer: few surprises in cartilage research". Journal of the National Cancer Institute 97 (21): 1562–3. doi:10.1093/jnci/dji392. PMID 16264172.
88.Ostrander GK, Cheng KC, Wolf JC, Wolfe MJ (2004). "Shark cartilage, cancer and the growing threat of pseudoscience". Cancer Research 64 (23): 8485–91. doi:10.1158/0008-5472.CAN-04-2260. PMID 15574750.
"
So what do you think about that? Does one of the possible ways to seek cures against cancer fall heroically ?