Abstract Introduction Evidence is accumulating that not all children with cancer have benefitted equally from diagnostic and therapeutic improvements and that socioeconomic conditions are also associated with prognosis - even in high-income countries where equal access to healthcare is presumed. We investigated the association between area-based socioeconomic background and childhood cancer survival in Germany with the ultimate aim to identify groups of children that may benefit from supportive interventions. Methods We identified all children with a first cancer diagnosis before the age of 15 years in 1997-2016 from the German Childhood Cancer Registry (N = 35,443). Based on individual residential address information (at diagnosis) we applied the German Index of Socioeconomic Deprivation as measure of area-based socioeconomic background. Using Cox proportional hazards models, we assessed the association between absolute area-based socioeconomic deprivation (AASD) and ten-year overall survival (OS) to estimate hazard ratios (HR) and corresponding 95% confidence intervals (CI). Results The Cox analysis (adjusted for diagnostic year, birth year and place of residence) revealed a null association for AASD and OS from all cancers combined (HR = 1.00, 95% CI 0.97; 1.03). Among children diagnosed with acute myeloid leukemia and germ cell tumors, a higher AASD (implying more severe levels of deprivation) was associated with worse survival, particularly pronounced in boys (HR = 1.18, 95% CI 1.01; 1.37; HR = 1.67, 95% CI 1.13; 2.45, respectively). The opposite was observed for childhood CNS tumours, yielding worse survival by decreasing AASD (HR = 0.93, 95% CI 0.88; 0.98) for both malignant and non-malignant CNS tumours. Conclusions Contrary to reports from other European countries, we found little evidence for pronounced social inequalities in childhood cancer survival in Germany based on a composite score, with inconsistent patterns across cancer types and age at diagnosis. Key messages • We found little evidence for pronounced social inequalities in childhood cancer survival in Germany on the area-based level. • Our findings indicated inconsistent patterns of social inequalities across cancer types and age at diagnosis.and age at diagnosis.
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