How elephants evolved to become big and cancer-resistant

All things being equal, large, long-lived animals should have the highest risk of cancer. The calculation is simple: Tumors grow when genetic mutations cause individual cells to reproduce too quickly. A long life creates more opportunities for those cancerous mutations to arise. So, too, does a massive body: Big creatures -- which have many more cells -- should develop tumors more frequently. Why, then, does cancer rarely afflict elephants, with their long lifespans and gargantuan bodies? They are some of the world's largest land animals.

source https://www.sciencedaily.com/releases/2021/02/210204131438.htm