Reprinted with permission from Gut:

Please note that this article was originally printed in Gut and the correct citation for this article is:

A prospective study of circulating mutant KRAS2 in the serum of patients with colorectal neoplasia: strong prognostic indicator in postoperative follow up
B M Ryan, F Lefort, R McManus, J Daly, P W N Keeling, D G Weir, and D Kelleher
Gut 2003; 52: 101-108.

The publishers apologise for any confusion that this might cause