Yes...my lawyer missed our last appointment... I'll continue to look for a real answer... According to National Geographic they have a low incidence which means that YES they do get sick. http://news.nationalgeographic.com/news/2003/08/0820_030820_sharkcancer.html Luer says that sharks aren't entirely cancer-free, a mistaken perception that has gained some public acceptance. "Lots of the media will overstate this [resistance] and say, 'sharks don't get cancer.' That's not the case, but their incidence is impressively low, the number of documented cases is low. We don't say that they don't get it, but we think that they must have some way to combat it." But not all scientists are sure that sharks are even resistant to cancer. Gary Ostrander, professor of biology and comparative medicine at Johns Hopkins University in Baltimore, Maryland, says that just because not a lot of evidence exists doesn't mean that the animals aren't getting cancer. "We don't know that they don't get cancer," he said. "Any suggestion that they get it at a lower rate than humans or other fish, is premature—because there haven't been any carefully conducted systematic studies. "I have not seen anything in the scientific literature that gives any confidence, with certainty, that sharks get cancer at a lower rate than fish or other species," he said. The incidence of shark disease is tough to ascertain. Systematic surveys of sharks are difficult to conduct, as capturing the animals in large numbers is time-consuming, and cancer tests would likely require the deaths of large numbers of sharks.