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In this study we aim to look for the clustering of colorectal cancer in families of a series of CRC patients from Iran.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>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.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>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 &lt; 0.001).<\/jats:p><jats:p>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.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>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.<\/jats:p><\/jats:sec>","DOI":"10.1186\/1471-2407-5-112","type":"journal-article","created":{"date-parts":[[2005,9,6]],"date-time":"2005-09-06T06:13:38Z","timestamp":1125987218000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Family history of colorectal cancer in Iran"],"prefix":"10.1186","volume":"5","author":[{"given":"Mahboobeh","family":"Mahdavinia","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Faraz","family":"Bishehsari","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Reza","family":"Ansari","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nasim","family":"Norouzbeigi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ahmad","family":"Khaleghinejad","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mahshid","family":"Hormazdi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Naser","family":"Rakhshani","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Reza","family":"Malekzadeh","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2005,9,5]]},"reference":[{"key":"300_CR1","doi-asserted-by":"publisher","first-page":"533","DOI":"10.1016\/S1470-2045(01)00486-7","volume":"2","author":"DM Parkin","year":"2001","unstructured":"Parkin DM: Global cancer statistics in the year 2000. 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