Prostate cancer is not a huge risk because the Prostate is a massive number of cells. So, cell type matters and elephants for example don't have the same number of skin cells relative to body mass as humans.
Cancer is not a single mutation. So, generally the first cancer cell is a descendent of the first cell that had a dangerous mutation. Further, some cells are being constantly produced over a lifetime (skin, GI tract etc), so you can mostly ignore mussel fiber or fact cells when calculating cancer risks.
In that context there are divisions related to growth and divisions related to homeostasis. Tacking on 4 extra related to growth is relatively less important vs lifespan and other factors especially when you look at human cancer risks pre 44.
Cancer is not a single mutation. So, generally the first cancer cell is a descendent of the first cell that had a dangerous mutation. Further, some cells are being constantly produced over a lifetime (skin, GI tract etc), so you can mostly ignore mussel fiber or fact cells when calculating cancer risks.
In that context there are divisions related to growth and divisions related to homeostasis. Tacking on 4 extra related to growth is relatively less important vs lifespan and other factors especially when you look at human cancer risks pre 44.