Maternal diabetes and incidence of childhood cancer – a nationwide cohort study and exploratory genetic analysis
Received 25 July 2017
Accepted for publication 13 September 2017
Published 30 November 2017 Volume 2017:9 Pages 633—642
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 2
Editor who approved publication: Professor Henrik Toft Sørensen
Anna Deleskog,1,* Marcel den Hoed,2,3,* Giorgio Tettamanti,1 Sofia Carlsson,1 Rickard Ljung,1 Maria Feychting,1 Hannah L Brooke1
1Unit of Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, 2Department of Immunology, Genetics and Pathology, 3Science for Life Laboratory, Uppsala University, Uppsala, Sweden
*These authors contributed equally to this work
Background: The etiology of childhood cancer is not well understood, but may be linked to prenatal and perinatal factors, such as maternal diabetes. However, this association has not been examined in depth. We aimed to determine if maternal diabetes is associated with risk of childhood brain tumor (CBT), leukemia (all types combined and acute lymphoblastic leukemia [ALL] separately), and lymphoma.
Methods: All children born in Sweden between 1973 and 2014 (n=4,239,965) were followed from birth until first cancer diagnosis, age 15 years, or December 31, 2015. Data on maternal diabetes, childhood cancer, and covariates were obtained from nationwide health registers. Incidence rate ratios (IRRs) and 95% confidence intervals (CIs) were calculated using Cox regression adjusted for potential confounders/mediators. Additionally, we performed an exploratory analysis using results from published genome-wide association studies and functional annotation.
Results: Maternal diabetes was associated with lower risk of CBT (adjusted IRR [95% CI]: 0.56 [0.35–0.91]) and higher risk of leukemia (adjusted IRR: 1.47 [1.13–1.92] for all leukemia combined and 1.64 [1.23–2.18] for ALL). These associations were similar for both maternal type 1 diabetes and gestational diabetes. Associations of five previously identified genetic loci were compatible with a causal effect of diabetes traits on neuroblastoma and common Hodgkin’s lymphoma.
Conclusion: Children whose mother had diabetes had lower risk of CBT and higher risk of leukemia, compared with children whose mother did not have diabetes. Our results are compatible with a role of prenatal and perinatal glycemic environment in childhood cancer etiology.
Keywords: neoplasm, childhood, diabetes, fetal growth, perinatal environment
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