Accumulated evidence suggests that increased body iron stores may increase the risk of colorectal cancer, possibly via catalyzing oxidation reactions.
We examined the relationship between iron status and colorectal cancer in a case-control study nested within the New York University Women's Health Study cohort.
For 105 incident cases of colorectal cancer with an average follow-up of 4.7 years and 523 individually matched controls, baseline levels of serum iron, ferritin, total iron binding capacity (TIBC) and transferrin saturation were determined as indicators of body iron stores, and total iron intake was assessed based on their diet and supplement intake.
Overall, there were no associations between the risk of colorectal cancer and any of these indices except for serum ferritin, which showed a significant inverse association.
When analyzed by subsite, there was an increasing trend in risk of cancer of the proximal colon with increasing total iron intake (p-value for trend=0.04).
In addition, a significantly increased risk of colorectal cancer associated with higher total iron intake [odds ratio (OR)=2.50 ; 95% confidence interval (Cl) : 1.06-5.87] was observed among subjects with higher intake of total fat.
Our results do not support a role of increased body iron stores in the development of colorectal cancer, but suggest that luminal exposure to excessive iron may possibly increase the risk in combination with a high fat diet.
Mots-clés Pascal : Tumeur maligne, Côlon, Rectum, Facteur risque, Epidémiologie, Réserve métabolique, Fer, Elément minéral, Alimentation, Etude cas témoin, New York, Etats Unis, Amérique du Nord, Amérique, Femelle, Homme, Appareil digestif pathologie, Intestin pathologie, Côlon pathologie, Rectum pathologie
Mots-clés Pascal anglais : Malignant tumor, Colon, Rectum, Risk factor, Epidemiology, Metabolic storage, Iron, Inorganic element, Feeding, Case control study, New York, United States, North America, America, Female, Human, Digestive diseases, Intestinal disease, Colonic disease, Rectal disease
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0118922
Code Inist : 002B13B01. Création : 16/11/1999.