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KMID : 0371020080410010017
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Journal of Preventive Medicine and Public Health
2008 Volume.41 No. 1 p.17 ~ p.22
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Comparison of Cancer Survival by Age Group for 1997 and for 2002: Application of Period Analysis using the National Cancer Incidence Database
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Yim Seon-Hee
Jung Gyu-Won
Shin Hae-Lim
Won Young-Joo
Kong Hyun-Joo
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Abstract
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Objective : Period analysis estimates up-to-date survival rates of cancer patients. In this approach, analysis is restricted to recent time period by left-truncating all observations at the beginning of the period and rightcensoring at its end. Here, we applied period analysis to examine changes in 5-year relative survival (RS) by age group for 1997 and for 2002.
Methods : Using the National Cancer Incidence Database, 5-year RS was estimated for 1997 and 2002 in four age groups (15-54, 55-64, 65-74, and 75 years old and over) using period analysis. After excluding death certificate-only cases, patients with an unknown date of diagnosis or follow-up length, a total of 813,889 patients diagnosed with a first primary invasive cancer during 1992-2002 were included for analysis. Followup for vital status was included until 31 December 2002.
Results : Five-year RS increased from 41.7% for 1997 to 46.7% for 2002. Increases in survival occurred in all age groups except in the 75 and over group.
Conclusion : The age gradient in cancer prognosis seems to have widened between 1997 and 2002, a finding that requires further study of prognostic factors, including stage at diagnosis. Period analysis accurately estimates survival rates, especially for cancers with better prognosis.
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KEYWORD
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Survival analysis, Neoplasms, Korea
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