|Why elephants rarely get cancer: Potential mechanism identified that may be key to cancer resistance:|
"Why elephants rarely get cancer is a mystery that has stumped scientists for decades. A study led by researchers at Huntsman Cancer Institute (HCI) at the University of Utah and Arizona State University, and including researchers from the Ringling Bros. Center for Elephant Conservation, may have found the answer.--end quote
According to the results, published today in the Journal of the American Medical Association (JAMA), and determined over the course of several years and a unique collaboration between HCI, Primary Children's Hospital, Utah's Hogle Zoo, and the Ringling Bros. Center for Elephant Conservation, elephants have 38 additional modified copies (alleles) of a gene that encodes p53, a well-defined tumor suppressor, as compared to humans, who have only two. Further, elephants may have a more robust mechanism for killing damaged cells that are at risk for becoming cancerous. In isolated elephant cells, this activity is doubled compared to healthy human cells, and five times that of cells from patients with Li-Fraumeni Syndrome, who have only one working copy of p53 and more than a 90 percent lifetime cancer risk in children and adults. The results suggest extra p53 could explain elephants' enhanced resistance to cancer."