You can do regular cleanses of the Colon and many remove all polyps and crap quite easily. As long as you keep this area clean i.e everything is able to move and escape as it should then you shouldn't have a problem as long as your diet is correct. If people just follow my protocols for Cancer throughout their lifes then they should do well enough to not get Cancer unless they get a serious dose of radiation or a chemical buildup etc etc.
Colonics and Enemas shouldn't be done on a regular basis and only really in emergencies and the bacteria must be added back.