A [meta-analysis](http://jncicancerspectrum.oxfordjournals.org/cgi/content/abstract/jnci%3b97/22/1679) of 15 published research studies on the potential link between colorectal cancer and diabetes found about a 30% increase in the risk for colorectal cancer in those people who had also been diagnosed with diabetes. More than a total of 2,500,000 people were included across all the studies.
There was no significant different in risk between men and women, between Europe or the United States, or between cancers in the colon or in the rectum.
Susanna C. Larsson and colleagues at the Karolinska Institutet in Stockholm reported their data in the November 16, 2005 issue of the [*Journal of the National Cancer Institute*](http://jncicancerspectrum.oxfordjournals.org/cgi/content/abstract/jnci%3b97/22/1679). They concluded:
Our findings strongly support a relationship between diabetes and increased risk of colon and rectal cancer in both women and men.
For a discussion of the study read [an article in *Reuters Health*](http://today.reuters.co.uk/news/newsArticle.aspx?type=healthNews&storyID=2005-11-17T152520Z_01_FLE755450_RTRIDST_0_HEALTH-COLONCANCER-DIABETES-DC.XML)