Racial and Ethnic Survival Disparities in Pediatric Oncology over Time: An Analysis of the SEER Registry

Abstract

Background/Purpose: Studies have demonstrated existing racial and ethnic disparities in multiple aspects of pediatric oncology. The purpose of this study was to examine how racial and ethnic disparities in mortality among pediatric oncology patients have changed over time. We examined mortality by race and ethnicity over time within the Surveillance, Epidemiology, and End Results (SEER) registry. MethodsPatients < 20 years-old from 1975 – 2016 (n=49,861) were selected for the analysis. Demographic characteristics, cancer diagnosis, and mortality data were extracted. Patients were divided by race and ethnicity: 1) non-Latino White, 2) Black, 3) Latino, and 4) Other Race. The interaction between race/ethnicity and decade was evaluated to better understand how disparities in mortality have changed over time. ResultsUnadjusted mortality among all cancers improved significantly, with 5-year mortality decreasing from the 1970s to the 2010s (log-rank: p< 0.001) for all race/ethnicity groups. However, improvements in mortality were not equal, with 5-year overall survival (OS) improving from 62.7% in the 1970s to 87.5% (Δ=24.8%) in the 2010s for White patients but only improving from 59.9% to 80.8% (Δ=20.9%) for Black patients (p<0.01). The interaction between Race/Ethnicity and decade demonstrated that the Hazard Ratio (HR) for mortality worsened for Black [HR (95% Confidence Interval): 1.10 (1.05-1.15) and Latino [1.11 (1.07-1.17)] patients compared to White, non-Latino patients. ConclusionThere has been a dramatic improvement in survival across pediatric oncology patients since 1975. However, the improvement has not been shared equally across racial/ethnic categories, with overall survival worsening over time for racial/ethnic minorities compared to White patients. Level of EvidenceIII