title: Risk of progression of advanced adenomas to colorectal cancer by age and sex: estimates based on 840,149 screening colonoscopies.
abstract: OBJECTIVE
  To derive age and sex specific estimates of transition rates from advanced adenomas to colorectal cancer by combining data of a nationwide screening colonoscopy registry and national data on colorectal cancer (CRC) incidence.
  
  
  METHODS
  Registry based study.
  
  
  METHODS
  National screening colonoscopy programme in Germany.
  
  
  METHODS
  Participants of screening colonoscopy in 2003 and 2004 (n = 840,149).
  
  
  METHODS
  Advanced adenoma prevalence, colorectal cancer incidence, annual and 10 year cumulative risk of developing CRC among carriers of advanced adenomas according to sex and age (range 55-80+ years)
  
  
  RESULTS
  The age gradient is much stronger for CRC incidence than for advanced adenoma prevalence. As a result, projected annual transition rates from advanced adenomas to CRC strongly increase with age (from 2.6% in age group 55-59 years to 5.6% in age group >or=80 years among women, and from 2.6% in age group 55-59 years to 5.1% in age group >or=80 years among men). Projections of 10 year cumulative risk increase from 25.4% at age 55 years to 42.9% at age 80 years in women, and from 25.2% at age 55 years to 39.7% at age 80 years in men.
  
  
  CONCLUSIONS
  Advanced adenoma transition rates are similar in both sexes, but there is a strong age gradient for both sexes. Our estimates of transition rates in older age groups are in line with previous estimates derived from small case series in the pre-colonoscopy era independent of age. However, our projections for younger age groups are considerably lower. These findings may have important implications for the design of CRC screening programmes.
authors.affiliation: Division of Clinical Epidemiology and Aging Research, German Cancer Research Center, Bergheimer Str. 20, D-69115 Heidelberg, Germany. h.brenner@dkfz-heidelberg.de
authors.forename: Hermann
authors.initials: H
authors.lastname: Brenner
authors.forename: Michael
authors.initials: M
authors.lastname: Hoffmeister
authors.forename: Christa
authors.initials: C
authors.lastname: Stegmaier
authors.forename: Gerhard
authors.initials: G
authors.lastname: Brenner
authors.forename: Lutz
authors.initials: L
authors.lastname: Altenhofen
authors.forename: Ulrike
authors.initials: U
authors.lastname: Haug
mesh_terms: D000236:Adenoma / Q000453:epidemiology / Q000473:pathology* / Q000517:prevention & control; D017677:Age Distribution; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D002471:Cell Transformation, Neoplastic; D003113:Colonoscopy; D015179:Colorectal Neoplasms / Q000453:epidemiology / Q000473:pathology* / Q000517:prevention & control; D018450:Disease Progression; D005260:Female; D005858:Germany / Q000453:epidemiology; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000191:economics*; D008875:Middle Aged; D011230:Precancerous Conditions / Q000453:epidemiology / Q000473:pathology; D012042:Registries / Q000706:statistics & numerical data; D012307:Risk Factors; D017678:Sex Distribution