Colonics and colon cancer

Hello all, I have been suffering from chronic constipation since my childhood. My mother also had a similar situation and she has been diagnosed with colon cancer. I have also read somewhere that if the bowel movements are not regular, then there are high chances of having a colon cancer.
So, I am scared. How curable is colon cancer? I have heard that having colonics ( http://www.coloncleansetoronto.ca/services/colon-hydrotherapy/ ) from Toronto can help to alleviate the symptoms. But, I am unsure about how effective this treatment is for the prevention of colon cancer.
How often can one have colonics? Can you depend on them for a bowel movement? Any guidance would be appreciated.