None: Colon cancer grows within the lumen of the bowel until a population of invasive cells spread to serosa and then nodes. It is probably secondary to a polyoma virus. Prostate Ca which is hormonally controlled probably arises from the MMTV virus entering the Wnt-1 gene to induce transformation. This same virus effects breast Ca and men married to women with Br Ca get more prostate Ca.
Answered 5/19/2018
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