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" ... A shark's immune system is famous mainly because many believe that sharks don't get cancer (a myth). This idea that they don't get cancer seems to stem from scant clinical evidence that cartilage has anti-angiogenic properties (meaning it inhibits the development of blood vessels, crucial to the growth of tumors). Since shark skeletons are made of cartilage, people believed they couldn't get the deadly disease. However growths have been documented in research papers and even photographs from divers, so while the incidence of cancer in sharks and their relatives may be low, it has been found in sharks. Dooley believes scientists will see greater rates of cancer in sharks as aquaria get better at keeping sharks for extended periods of time, as cancer is generally a disease of older animals (including humans). In fact, she reckons that due to competition for food, we just may not be seeing these sick animals in the wild. ... "