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IJE Advance Access published online on September 28, 2006
International Journal of Epidemiology, doi:10.1093/ije/dyl177
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Published by Oxford University Press on behalf of the International Epidemiological Association © The Author 2006; all rights reserved.
Accepted July 10, 2006

Original paper

Parental age and risk of childhood cancers: a population-based cohort study from Sweden

Benjamin H. Yip 1, Yudi Pawitan 1, and Kamila Czene 1 *

1 Department of Medical Epidemiology and Biostatistics, Karolinska Institute, 171 77 Stockholm, Sweden

* To whom correspondence should be addressed.
Kamila Czene, E-mail: kamila.czene{at}meb.ki.se


  Abstract

Background Frequent germ line cells mutations were previously demonstrated to be associated with aging. This suggests a higher incidence of childhood cancer among children of older parents. A population-based cohort study of parental ages and other prenatal risk factors for five main childhood cancers was performed with the use of a linkage between several national-based registries.

Methods In total, about 4.3 million children with their parents, born between 1961 and 2000, were included in the study. Multivariate Poisson regression was used to obtain the incidence rate ratios (IRR) and 95% confidence interval (CI). Children <5 years of age and children 5-14 years of age were analysed independently.

Results There was no significant result for children 5-14 years of age. For children <5 years of age, maternal age were associated with elevated risk of retinoblastoma (oldest age group's IRR = 2.39, 95%CI = 1.17-4.85) and leukaemia (oldest age group's IRR = 1.44, 95%CI = 1.01-2.05). Paternal age was significantly associated with leukaemia (oldest age group's IRR = 1.31, 95%CI = 1.04-1.66). For central nervous system cancer, the effect of paternal age was found to be significant (oldest age group's IRR = 1.69, 95%CI = 1.21-2.35) when maternal age was included in the analysis.

Conclusion Our findings indicate that advanced parental age might be associated with an increased risk of early childhood cancers.

Keywords: childhood cancer; relative risk; paternal age; maternal age; incidence.
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