title: Relative Survival of Breast Cancer Patients in Iran.
abstract: BACKGROUND
  The survival rate reflecting prognosis of breast cancer patients is usually estimated based on crude survival methods such as observed and cause-specific. In situations where data are based on population-cancer registries, this method may produce biased estimations. This study therefore aimed to estimate the net survival of breast cancer based on relative survival.
  
  
  METHODS
  Data for 622 breast cancer patients diagnosed at the Iran Cancer Institute during 1990-95 and tracked till the end of 2000 were analyzed. For estimation of relative survival, Ederer's second method and SAS (9.1) and STATA (11) software were used.
  
  
  RESULTS
  Three- year relative survivals of 85%, 90%, 80% and 67% were observed for age groups 15-44, 55-59, 60-74, and 75+ years-old, respectively. A relative survival of approximately one was observed for two subsequent years for age-group 45-59 years-old. A value greater than one for two subsequent years of follow-up was observed in the age-group 60-74 years-old.
  
  
  CONCLUSIONS
  Tracking the diagnosis of breast cancer, the relative survival decreases as we go to higher age-groups. It is also perceived that through follow-up, relative survival first decreased and then increased a little. The statistical cure point is acceptable for age group 45-59 years-old while for age-groups 15-44 and 60-74 years old is a sign of low quality data for some follow-up intervals.
authors: Alireza
authors: A
authors: Mosavi-Jarrahi
authors: Alireza
authors: A
authors: Abadi
authors: Yadollah
authors: Y
authors: Mehrabi
authors: Mahmood
authors: M
authors: Mahmoodi
authors: Mohammad Reza
authors: MR
authors: Eshraghian
authors: Kazem
authors: K
authors: Mohammad
authors: Heidar Ali
authors: HA
authors: Mardani-Fard
authors: Amir
authors: A
authors: Kasaeian
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001943:Breast Neoplasms / Q000175:diagnosis / Q000453:epidemiology / Q000401:mortality*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008875:Middle Aged; D009026:Mortality / Q000639:trends*; D011379:Prognosis; D012042:Registries; D015996:Survival Rate; D055815:Young Adult