title: Yield from colonoscopic screening in people with a strong family history of common colorectal cancer.
abstract: OBJECTIVE
  People with a strong family history of common (so-called 'sporadic') colorectal cancer are generally advised to undergo colonoscopic screening, but the starting age for this is unclear. An audit was performed to study the age-related yield of screening colonoscopy in this risk group.
  
  
  METHODS
  A prospective audit of the outcome of screening colonoscopy was performed on a cohort of 232 people with a strong family history of common colorectal cancer. All were registrants in a familial bowel cancer service solely because of their family medical history. They had no bowel symptoms and no prior endoscopic investigation of the large bowel.
  
  
  RESULTS
  Neoplastic lesions were detected by using colonoscopy in 33 participants. In 27 participants, the major lesion was a small tubular adenoma, four had an advanced adenoma and two had cancer. More neoplastic (P= 0.02) and advanced neoplastic (P= 0.03) lesions were found in those patients aged > or = 50 years. Only one advanced adenoma was detected in a participant below the age of 50 years.
  
  
  CONCLUSIONS
  The yield from screening colonoscopy in young people (< 50 years) with a strong family history of common colorectal cancer is low, placing doubt on the need for colonoscopic screening before the age of 50 years.
authors.affiliation: Department of Gastroenterology, The Royal Melbourne Hospital and the University of Melbourne, Vic, Australia.
authors.forename: D J
authors.initials: DJ
authors.lastname: Dowling
authors.forename: D J
authors.initials: DJ
authors.lastname: St John
authors.forename: F A
authors.initials: FA
authors.lastname: Macrae
authors.forename: J L
authors.initials: JL
authors.lastname: Hopper
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D003113:Colonoscopy; D015179:Colorectal Neoplasms / Q000453:epidemiology / Q000235:genetics* / Q000473:pathology; D005260:Female; D006801:Humans; D016013:Likelihood Functions; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009517:New South Wales / Q000453:epidemiology; D015995:Prevalence; D011446:Prospective Studies; D012042:Registries; D012307:Risk Factors