Johns Hopkins has recently sent this information out in its newsletters.  It is being circulated at Walter Reed Army Medical Center also.
Information taken from the Health News and Views paper dated January 2008

Cancer Update from Johns Hopkins

“Every person has cancer cells in the body.  These cancer cells do not show up in the standard tests until they have multiplied to a few billion.  When doctors tell cancer patients that there are no more cancer cells in their bodies after treatment, it just means the tests are unable to detect the cancer cells because they have not reached the detectable size.  Cancer cells occur between 6 to more than 10 times in a person’s lifetime.  When the person’s immune system is strong, the cancer cells will be destroyed and prevented from multiplying and forming tumors.  When a person has cancer, it indicates the person has multiple nutritional deficiencies.  These could be due to genetic, environmental, food and lifestyle factors.  To overcome the multiple nutritional deficiencies, changing diet and including supplements will strengthen the immune system.”

Changing Prostate Cancer Genes with Lifestyle
 
If you believe that cancer is genetic and there's nothing you can do to prevent it, take a look at the latest study from Dr. Dean Ornish.  He reports that after just three months of a healthful diet and exercise, the genes associated with prostate cancer changed toward normal (Proceedings of the National Academy of Sciences, June 17, 2008; http://www.pnas.org/cgi/content/full/105/24/8369).