Do sharks really not get cancer, and if not why?

zxcv zxcv at zxcv.zxcv
Fri Feb 21 21:18:40 EST 1997


Bruce Heyer wrote:
> 
> In article <Pine.SOL.3.91.970218102047.9795C-100000 at general3.asu.edu>,
> natural at imap1.asu.edu wrote:

> Sharks DO get cancer - though at a low frequency of occurance.  Most
> cold-blooded animals have lower cancer rates than do warm-blooded mammals
> like us. (The warming system of lamnoid sharks is not the same as
> warm-blooded.)  Of course sharks do not indulge in the social carcinogens
> that humans do either.
> 
Why do cold blooded organisms get cancer at the lower rates?  Does it
have anything to do with lesser than optimum growing conditions for the
tumors due to varying temperature, or differential growth rates,
metabolism, or something else?



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