Do turtles get cancer?

Turtles are renowned for their extreme longevity and tremendous range in body size. Theoretically, large, long-lived organisms should face higher cancer risks because of increased cell numbers and lifetime cellular turnover, yet cancer appears to be exceptionally rare in turtles. In the present article, we synthesize the current knowledge on cancer prevalence in turtles, drawing from zoo necropsies, pathology reports, and comparative oncology studies, and present new data spanning additional species that reinforce this pattern. Emerging molecular evidence suggests that turtles possess high resistance to oxidative stress and protein dysregulation, which may contribute to cancer resistance. Given their extreme lifespans and unique physiology, turtles represent a promising but underexplored model for studying the evolution of longevity and natural cancer suppression mechanisms.