title: International trends in the incidence of testicular cancer, 1973-2002.
abstract: BACKGROUND
  Whereas testicular cancer incidence rates have been widely reported in populations of Northern European ancestry, rates in other populations have been less frequently examined. In a prior report, global testicular cancer incidence rates and trends for the years 1973 to 1997 were summarized. The current report extends these analyses with an additional 5 years of data from Cancer Incidence in Five Continents.
  
  
  METHODS
  Age-standardized incidence rates over successive 5-year time periods were obtained for populations in the Americas, Asia, Europe, and Oceania.
  
  
  RESULTS
  In general, testicular cancer incidence remained highest in Northern European populations (8.0-9.0 per 100,000) and lowest in Asian and African populations (<1 per 100,000). One notable exception to this pattern, however, was the very high rate reported by the Valdivia, Chile registry (8.8 per 100,000). In many populations, rates rose between 1973 and 2002, although the increases were strongest and most consistent among populations of European ancestry. In certain European populations, such as those of Denmark and of Geneva, Switzerland, some recent plateauing of rates was evident. There was little evidence of increase and possible evidence of a modest decline in rates among east Asian populations. Trends by histology (seminoma and nonseminoma) were generally similar to one another.
  
  
  CONCLUSIONS
  Risk of testicular cancer remains relatively high in Northern European populations and low in Asian and African populations. Similar trends by histology suggest common risk factors. EFFECT: Reasons for increasing rates among Northern Europeans and stable or declining rates among East Asians are unexplained, supporting the need for future etiologic studies.
authors.affiliation: Hormonal and Reproductive Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, EPS/Suite 550, 6120 Executive Boulevard, Rockville, MD 20892-7234, USA.
authors.forename: Victoria M
authors.initials: VM
authors.lastname: Chia
authors.forename: Sabah M
authors.initials: SM
authors.lastname: Quraishi
authors.forename: Susan S
authors.initials: SS
authors.lastname: Devesa
authors.forename: Mark P
authors.initials: MP
authors.lastname: Purdue
authors.forename: Michael B
authors.initials: MB
authors.lastname: Cook
authors.forename: Katherine A
authors.initials: KA
authors.lastname: McGlynn
mesh_terms: D014943:Global Health; D006801:Humans; D015994:Incidence; D008297:Male; D013736:Testicular Neoplasms / Q000453:epidemiology*
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