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Measuring childhood cancer late effects: evidence of a healthy survivor effect

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Authors
Asdahl, Peter Haubjerg
Ojha, Rohit Priyadarshi
Winther, Jeanette Falck
Holmqvist, Anna Sällfors
de Fine Licht, Sofie
Gudmundsdottir, Thorgerdur
Madanat-Harjuoja, Laura
Tryggvadottir, Laufey
Andersen, Klaus Kaae
Hasle, Henrik
Issue Date
2017-11-28

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Citation
Measuring childhood cancer late effects: evidence of a healthy survivor effect 2017, 32 (12):1089 European Journal of Epidemiology
Abstract
Given considerable focus on health outcomes among childhood cancer survivors, we aimed to explore whether survivor bias is apparent during long-term follow-up of childhood cancer survivors. METHODS: We identified all 1-year survivors of cancer diagnosed before 20 years of age in Denmark, Finland, Iceland, and Sweden. From the general population, we randomly sampled a comparison cohort. Study individuals were followed for hospitalizations for diseases of the gastroenterological tract, endocrine system, cardiovascular system, or urinary tract from the start of the cancer registries to 2010. We estimated cumulative incidence with death as competing risk and used threshold regression to compare the hazards of the diseases of interest at ages 20, 40, 60, and 75 years. RESULTS: Our study included 27,007 one-year survivors of childhood cancer and 165,620 individuals from the general population. The cumulative incidence of all four outcomes was higher for childhood cancer survivors during early adulthood, but for three outcomes, the cumulative incidence was higher for the general population after age 55 years. The hazard ratios (HRs) decreased for all outcomes with increasing age, and for two of the outcomes, the hazards were higher for the general population at older ages (endocrine diseases: age-specific HRs = 3.0, 1.4, 1.0, 0.87; Cardiovascular diseases: age-specific HRs = 4.1, 1.4, 0.97, 0.84). CONCLUSIONS: Our findings provide empirical evidence that survivor bias attenuates measures of association when comparing survivors with the general population. The design and analysis of studies among childhood cancer survivors, particularly as this population attains older ages, should account for survivor bias to avoid misinterpreting estimates of disease burden.
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http://link.springer.com/10.1007/s10654-017-0305-4
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Archived with thanks to European Journal of Epidemiology
ae974a485f413a2113503eed53cd6c53
10.1007/s10654-017-0305-4
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English Journal Articles (Peer Reviewed)

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