Yes.  There are many studies that have been done looking at this topic and we have found that colonoscopy and colon cancer screening do saves lives.  It is estimated that over 150,000 people will be diagnosed with colon cancer in the United States this year and 50,000 will die from colon cancer.  There was a large, long term study from Harvard School of Public Health that concluded that 40% of all colorectal cancers could be prevented if people underwent colonoscopy screening.  The National Polyp Study done in the United States in 1993 found anywhere from a 76% to 90% reduction in colon cancer risk among those that were screened with colonoscopy.  These are just 2 of many examples of studies we have showing that colonoscopy is effective in helping to prevent colon cancer by finding and removing polyps and that it does save lives.