How Do Blue Whales Avoid Cancer?

800px-Blue_whale_tail

Carl Zimmer raises a fascinating question:

Blue whales can weigh over a thousand times more than a human being. That’s a lot of extra cells, and as those cells grow and divide, there’s a small chance that each one will mutate. A mutation can be harmless, or it can be the first step towards cancer. As the descendants of a precancerous cell continue to divide, they run a risk of taking a further step towards a full-blown tumor. To some extent, cancer is a lottery, and a 100-foot blue whale has a lot more tickets than we do...

Yet there seems to be no correlation between body size and cancer rates among animal species. We run a thirty percent risk of getting cancer over our life time. So do mice, despite the fact that they’re 1000 times smaller than we are. All animals studied so far have cancer rates in that ballpark. (And yes, sharks do get cancer.)

Caulin and Maley argue that when animals evolve to larger sizes, they must evolve a better way to fight against cancer.

And thanks for all the fish ...

(Photo: Mike Baird from Morro Bay, USA, via Flickr. Baird's Blurb book is here.)

2006-2011 archives for The Daily Dish, featuring Andrew Sullivan

Google Street View, Transformed Into a Tiny Planet

A 360-degree tour of our world, made entirely from Google's panoramas

Join the Discussion

After you comment, click Post. If you’re not already logged in you will be asked to log in or register.

blog comments powered by Disqus

Video

Google Street View, Transformed Into a Tiny Planet

A 360-degree tour of our world, made entirely from Google's panoramas

Video

The 86-Year-Old Farmer Who Won't Quit

A filmmaker returns to his hometown to profile the patriarch of a family farm

Video

Riding Unicycles in a Cave

"If you fall down and break your leg, there's no way out."

Video

Carrot: A Pitch-Perfect Satire of Tech

"It's not just a vegetable. It's what a vegetable should be."

Video

The Benefits of Living Alone on a Mountain

"You really have to love solitary time by yourself."

Just In