title: Iranian dietary patterns and risk of colorectal cancer.
abstract: BACKGROUND
  Role of diet on colorectal cancer (CRC) has been considered in terms of single foods and nutrients, but less frequently in terms of dietary patterns in Iran. The objective of this study was to determine the association between Iranian dietary patterns and CRC.
  
  
  METHODS
  This case-control study was conducted in four hospitals in Tabriz City of Iran including 414 participants aged 35-75 years:207 cases with CRC confirmed by pathology and colonoscopy findings were selected and 207 controls free of neoplastic conditions and diet-related chronic diseases (from the same hospital at the same period for the cases). Dietary data were assessed using a 123-item semi-quantitative food frequency questionnaire. Two dietary patterns were found by using of Principal Component Analysis (PCA) method;"Healthy pattern"and "Iranian pattern". Multivariate logistic regression analysis was used to estimate adjusted odds ratios (OR) for relationship between dietary patterns and colorectal cancer.
  
  
  RESULTS
  After adjusting for confounding factors, the Iranian dietary pattern was significantly associated with an increased odds of colorectal cancer (OR= 1.46; 95% Confidenec Interval (CI)=1.05-2.19) while a reduced odds of colorectal cancer was observed with the Healthy dietary pattern (OR=0.18; 95% CI= 0.091-0.47).
  
  
  CONCLUSIONS
  Iranian dietary pattern (IDP) seems to increase the odds of colorectal cancer and protective effect of Healthy dietary pattern.
authors.affiliation: Department of Control & Prevention of Disease, Tabriz University of Medical Sciences, Tabriz, Iran ; Department of Epidemiology, Ilam University of Medical Sciences, Ilam, Iran.
authors.forename: Hosein
authors.initials: H
authors.lastname: Azizi
authors.affiliation: Department of Epidemiology, Faculty of Medicine, Ilam University of Medical Sciences, Ilam, Iran.
authors.forename: Khairollah
authors.initials: K
authors.lastname: Asadollahi
authors.affiliation: Department of Epidemiology, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Elham
authors.initials: E
authors.lastname: Davtalab Esmaeili
authors.affiliation: Malekan Health Center, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Mirzapoor
keywords: Case control study; Colorectal cancer; Dietary; Iran; Odds Ratio