Relative Survival of Breast Cancer Patients in Iran

  • Kasaeian, Amir (Non-Communicable Diseases Research Center, Endocrinology and Metabolism Population Sciences Institute, Tehran University of Medical Sciences) ;
  • Mosavi-Jarrahi, Alireza (Department Social Medicine, Shahid Beheshti University of Medical Sciences) ;
  • Abadi, Alireza (Department of Community and Health, School of Medicine, Shahid Beheshti University of Medical Sciences) ;
  • Mahmoodi, Mahmood (Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences) ;
  • Mehrabi, Yadollah (Department of Epidemiology, School of Public Health, Shahid Beheshti University of Medical Sciences) ;
  • Mohammad, Kazem (Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences) ;
  • Eshraghian, Mohammad Reza (Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences) ;
  • Zare, Ali (Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences)
  • Published : 2015.09.02


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. Materials and 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: Threeyear 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.


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