Data from more than two decdes of screening for breast and prostate cancer shows that some cancers were destined to stop growing on their own or shrink, or even, at least in the case of some breast cancers, disappear.
In these cases, people who prayed for relief from cancer would attribute this remission to God. It has now been shown that
"Cancer cells need the cooperation of surrounding cells and even, he said, the whole organism, the person, whose immune system or hormone levels, for example, can squelch or fuel a tumor."
Disappearing tumors are well known in testicular cancer. Dr. Jonathan Epstein at Johns Hopkins says it does not happen often, but it happens.
A young man may have a lump in his testicle, but when doctors remove the organ all they find is a big scar. The tumor that was there is gone. Or, they see a large scar and a tiny tumor because more than 95 percent of the tumor had disappeared on its own by the time the testicle was removed.
See the abstract at the Journal of American Medical Association: http://jama.ama-assn.org/cgi/content/short/302/15/1685?home
See the newspaper article at http://www.nytimes.com/2009/10/27/health/27canc.html?8dpc