title: Period estimates of cancer patient survival are more up-to-date than complete estimates even at comparable levels of precision.
abstract: OBJECTIVE
  Period analysis provides more up-to-date estimates of cancer patient survival than traditional methods, but there is a trade-off between up-to-dateness and precision. Our objective was to compare the performance of period and complete analysis in terms of up-to-dateness and precision of survival estimates.
  
  
  METHODS
  Five-year relative survival data actually observed for patients diagnosed with 1 of 20 common forms of cancer in Finland in 36 overlapping 5-year periods between 1958-1962 and 1993-1997 were compared with period estimates and various variants of complete estimates of 5-year relative survival potentially available during these periods.
  
  
  RESULTS
  At comparable levels of up-to-dateness, survival estimates from period analysis were more precise than survival estimates from complete analysis. At comparable levels of precision, period analysis provided more up-to-date survival estimates than did complete analysis.
  
  
  CONCLUSIONS
  These results further encourage more widespread use of period analysis as a standard tool for up-to-date monitoring of cancer patient survival by population-based cancer registries.
authors.affiliation: Department of Epidemiology, German Center for Research on Aging, Bergheimer Strasse 20, D-69115 Heidelberg, Germany. h.brenner@dkfz-heidelberg.de
authors.forename: Hermann
authors.initials: H
authors.lastname: Brenner
authors.forename: Timo
authors.initials: T
authors.lastname: Hakulinen
mesh_terms: D005387:Finland / Q000453:epidemiology; D006801:Humans; D009369:Neoplasms / Q000401:mortality*; D011379:Prognosis; D012042:Registries; D016019:Survival Analysis; D015996:Survival Rate