SHARK SHOCKER! Even These Apex Predators Can Get Cancer!

The notion that sharks are immune to cancer has been a persistent popular belief for decades. This misconception gained significant traction in the 1970s following research into cartilage, which suggested it could inhibit the growth of new blood vessels, a characteristic of malignant tumors. While initial experiments used rabbit cartilage, the focus soon shifted to sharks due to their cartilaginous skeletons. This led to the widespread, yet scientifically unfounded, claim that shark cartilage could prevent or even cure cancer in humans, a belief further popularized by books and media reports in the 1990s.

However, scientific evidence has long contradicted this myth. The first documented case of cancer in a shark dates back to 1908, and numerous examples of various types of tumors have since been identified in over 40 species of sharks and their relatives. The rarity of observing cancer in wild sharks likely contributed to the misconception, as cancer is often an internal disease, and sick or dying sharks are quickly consumed by other predators or sink to the ocean floor, making their diseased states difficult for humans to detect.

Despite not being immune, sharks do offer fascinating insights into cancer research. Recent studies suggest that sharks possess some of the lowest mutation rates among vertebrates, which may contribute to a reduced likelihood of developing cancers. Additionally, their robust immune systems, featuring specialized organs, have evolved powerful anti-cancer mechanisms. Nevertheless, the harmful myth that sharks do not get cancer has unfortunately fueled the unsustainable harvesting of sharks for ineffective cartilage supplements, significantly impacting their populations.