Fox7 said...
Does anyone here know what the percentage risk is of colon cancer in people with Crohn's? I'd really like to think that it is rare, but haven't been able to find this info anywhere.
Colon cancer has been more studied in Ulcerative Colitis than in Crohn's, but for Crohn's colitis the risk is probably about
the same. For future reference, colits means inflammation of the colon; pancolitis means inflammation of the
whole colon, not just a part of it. Whether you have UC or Crohn's, the highest cancer risk factor by far is having pancolitis.
The lifetime risk of developing colorectal cancer for
everyone is estimated at 1 in 20 (or 5%):
www.cancer.org/cancer/colonandrectumcancer/detailedguide/colorectal-cancer-key-statistics For people with pancolitis, there is no increased risk of CRC for the first 8-10 years. After that the cumulative risk of getting CRC rises by a few % with each decade; at 30 years it's 12-20%. But since nobody understands statistics (including me; I need to take a crash course in this shizzle), here's a few excerpts from studies instead:
To provide accurate estimates of the risk of colorectal cancer among patients with ulcerative colitis, we studied a population-based cohort of 3117 patients given a diagnosis of ulcerative colitis from 1922 through 1983 who were followed up through 1984. Ninety-two cases of colorectal cancer occurred in 91 patients. ~~~
In a review of 1248 cases of ulcerative colitis seen at the Cleveland Clinic that were followed up to 1984 (mean, 14.4 years), 82 patients (6.5%) were subsequently found to have colorectal cancer and 48 (3.8%) had extracolonic malignancy, 6 of them with associated colorectal cancer. Most patients with colorectal cancer were men (2:1), and had extensive (90%) and long-lasting colitis (10 years or more in 93% of cases; mean 18 years).~~~
During the 22 year period from the beginning of 1966 to the end of 1987, 401 patients [with extensive UC] entered the programme and together contributed 4048 patient-years of observation. Apart from nine patients who left the country, follow up is complete until 1986 or 1987. Colorectal carcinoma developed in 22 patients and, in a further 12, biopsy evidence of precancer, described as severe/high grade dysplasia, was confirmed in a colectomy specimen. ~~~
Links to all these studies can be found in this rather dense article on colorectal cancer surveillance and IBD:
www.uptodate.com/contents/colorectal-cancer-surveillance-in-inflammatory-bowel-diseaseLong-term use of 5-ASAs are thought to have a preventative effect against colorectal cancer. 5-ASAs are the mildest class of meds for IBD: if you get diagnosed, you'll probably be put on one. One very good reason for staying on your meds, even if you go into remission.
Anyway, I have probably posted far more than you actually want to know, but I hope this helps soothe your fears about
colorectal cancer.
Edit: Yeah, whatever gumby posted. I'm sure it's a lot more readable :p
Post Edited (NiceCupOfTea) : 12/17/2013 6:56:18 PM (GMT-7)