I've been reading more and more about the famous viral link to some cancers too.

http://my.webmd.com/content/article/78/95750.htm
http://www.oralcancerfoundation.org/news/story.asp?newsId=51

I know this isn't a new concept, (a lot can be found on this very site) I think the link that some viruses change the genetic makeup somehow will be the ultimate linkage.

A fascinating book is: "How to win the Nobel Prize" by Prof. J. Michael Bishop

http://www.npr.org/templates/story/story.php?storyId=1334346

Incidentally, the author of the two books "Shark's Don't Get Cancer" has been proven wrong several times. Sharks DO in-fact get cancer, and cancer in their cartilage too.
http://my.webmd.com/content/article...p;condition=Home%20&%20Top%20Stories

http://www.straightdope.com/columns/041022.html

But, I know shark cartilage has 'some' therapeutic affects on the growth of new blood vessels. I guess it's been clinically proven to retard this growth. My dad has taken it religiously as a treatment (which for him has worked) of an outbreak he gets occasionally (skin lesion). Anyway, following his heart attack the cardiologist insisted he stop taking the shark cartilage since it retards new blood vessel growth.

http://www.cancer.gov/newscenter/sharkcartilage

Just some anecdotal information I wanted to share.

Michael | 53 | SCC | Right Tonsil | Dx'd: 06-10-05 | STAGE IV, T3N2bM0 | 3 Nodes R Side | MRND & Tonsillectomy 06/29/05 Dr Fee/Stanford | 8 wks Rad/Chemo startd August 15th @ MSKCC, NY | Tx Ended: 09-27-05 | Cancer free at 16+ Yrs | After-Effects of Tx: Thyroid function is 0, ok salivary function, tinnitus, some scars, neck/face asymmetry, gastric reflux. 2017 dysphagia, L Carotid stent / 2019, R Carotid occluded not eligible for stent.2022 dental issues, possible ORN, memory/recall challenges.