title: Frequency of all types of colorectal tumors in the patients referred to selected hospitals in tehran.
abstract: BACKGROUND
  Colorectal cancer (CRC) is one of the most common cancers worldwide which is not extensively researched in Iran.
  
  
  OBJECTIVE
  The present study aims to investigate the epidemiologic characteristics of CRC in patients referred to selected hospitals of Tehran University of Medical Sciences.
  
  
  METHODS
  In this descriptive-analytic study 218 patients with colorectal cancer were investigated. Data were collected via reviewing recorded pathologic results of patients of these hospitals which then were analyzed by univariant methods.
  
  
  RESULTS
  Among 218 patients, 140 (64.2%) were male and 78 (35.8%) were female. Of all patients, 132 (60.0%) suffered from tumors in rectum; 38 (17.4%) in sigmoid; 12 (5.5%) in descending colon; 10 (4.6%) in transverse colon and 26 (11.9%) in ascending colon and cecum. Tumors were well differentiated in 134 patients (61.5%), moderately in 62 cases (28.4%) and poorly differentiated in 22 patients (10.1%). There was no significant difference between males and females regarding the location and degree of tumor differentiation.
  
  
  CONCLUSIONS
  Regarding high prevalence of colorectal cancer in Iran and potential environmental and genetic factors, surveillance must be considered for this disease. Its risk factors such as diet, life style and low physical activity should be evaluated and screening should start at younger ages.
authors.affiliation: Mostafa Khomeini Hospital, Department of Surgery, Shahed University, Tehran, IR Iran.
authors.forename: Farzaneh
authors.initials: F
authors.lastname: Golfam
authors.affiliation: Imam Reza Hospitah, Kermanshah University of Medical Sciences, Kermanshah, IR Iran.
authors.forename: Parisa
authors.initials: P
authors.lastname: Golfam
authors.affiliation: Student Research Committee, Shahed University, Tehran, IR Iran.
authors.forename: Zeinab
authors.initials: Z
authors.lastname: Neghabi
keywords: Adenocarcinoma; Colon; Colorectal Cancer