title: Family history of colorectal cancer in Iran.
abstract: BACKGROUND
  Previous reports show a high proportion of young CRC patients in Iran. In this study we aim to look for the clustering of colorectal cancer in families of a series of CRC patients from Iran.
  
  
  METHODS
  The family history of cancer is traced in 449 CRC patients of which 112 were 45 yrs or younger and 337 were older than 45 yrs at time of diagnosis. The patients were admitted in two hospitals in Tehran, during a 4-year period.
  
  
  RESULTS
  Clinical diagnosis of HNPCC was established in 21 (4.7%) probands. Family history of CRC was more frequently reported by early-onset than by late-onset patients (29.5% vs. 12.8%, p < 0.001). Distribution of tumor site differed significantly between those with and without family history of CRC. Right colon cancer was the most frequent site (23/45, 35.4%) observed in patients with positive family history of colorectal cancer.
  
  
  CONCLUSIONS
  The relatively high frequency of CRC clustering along with HNPCC in our patients should be further confirmed with larger sample size population-based and genetic studies to establish a cost effective molecular screening for the future.
authors.affiliation: Digestive Disease Research Centre, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran. mahdavi@ddrcir.org
authors.forename: Mahboobeh
authors.initials: M
authors.lastname: Mahdavinia
authors.forename: Faraz
authors.initials: F
authors.lastname: Bishehsari
authors.forename: Reza
authors.initials: R
authors.lastname: Ansari
authors.forename: Nasim
authors.initials: N
authors.lastname: Norouzbeigi
authors.forename: Ahmad
authors.initials: A
authors.lastname: Khaleghinejad
authors.forename: Mahshid
authors.initials: M
authors.lastname: Hormazdi
authors.forename: Naser
authors.initials: N
authors.lastname: Rakhshani
authors.forename: Reza
authors.initials: R
authors.lastname: Malekzadeh
mesh_terms: D000328:Adult; D017668:Age of Onset; D002277:Carcinoma / Q000235:genetics*; D015179:Colorectal Neoplasms / Q000235:genetics*; D003123:Colorectal Neoplasms, Hereditary Nonpolyposis / Q000235:genetics*; D005192:Family Health; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D007492:Iran; D008297:Male; D008875:Middle Aged; D015233:Models, Statistical; D013997:Time Factors