Background
Accurate childhood cancer burden data are crucial for resource planning and health policy prioritization. Model-based estimates are necessary because cancer surveillance data are scarce or nonexistent in many countries. Although global incidence and mortality estimates are available, there are no previous analyses of the global burden of childhood cancer represented in disability-adjusted life years (DALYs).
Methods
Using the Global Burden of Diseases, Injuries, and Risk Factors Study (GBD) 2017 methodology, childhood (ages 0–19 years) cancer mortality was estimated by use of vital registration system data, verbal autopsy data, and population-based cancer registry incidence data, which were transformed to mortality estimates through modeled mortality-to-incidence ratios (MIRs). Childhood cancer incidence was estimated using the mortality estimates and corresponding MIRs. Prevalence estimates were calculated by using MIR to model survival and multiplied by disability weights to obtain years lived with disability (YLDs). Years of life lost (YLLs) were calculated by multiplying age-specific cancer deaths by the difference between the age of death and a reference life expectancy. DALYs were calculated as the sum of YLLs and YLDs. Final point estimates are reported with 95% uncertainty intervals.
Findings
Globally, in 2017, there were 11.5 million (95% uncertainty interval 10.6–12.3) DALYs due to childhood cancer, 97.3% (97.3–97.3) of which were attributable to YLLs and 2.7% (2.7–2.7) of which were attributable to YLDs. Childhood cancer was the sixth leading cause of total cancer burden globally and the ninth leading cause of childhood disease burden globally. 82.2% (82.1–82.2) of global childhood cancer DALYs occurred in low, low-middle, or middle Socio-demographic Index locations, whereas 50.3% (50.3–50.3) of adult cancer DALYs occurred in these same locations. Cancers that are uncategorized in the current GBD framework comprised 26.5% (26.5–26.5) of global childhood cancer DALYs.
Interpretation
The GBD 2017 results call attention to the substantial burden of childhood cancer globally, which disproportionately affects populations in resource-limited settings. The use of DALY-based estimates is crucial in demonstrating that childhood cancer burden represents an important global cancer and child health concern.
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Citation
GBD 2017 Childhood Cancer Collaborators. The global burden of childhood and adolescent cancer in 2017: an analysis of the Global Burden of Disease Study 2017. The Lancet Oncology. 29 July 2019. http://dx.doi.org/10.1016/S1470-2045(19)30339-0
