Abstract
Racial and ethnic disparities in the incidence of esophageal cancer have not been thoroughly characterized with quantitative health-disparity measures. Using data from 1992-2013 from 13 US cancer registries in the Surveillance, Epidemiology, and End Results database, we assessed such disparities according to histological type, based on a variety of disparity metrics. The age-standardized incidence rate of squamous cell carcinoma (SCC) was highest among black persons, while adenocarcinoma mainly affected white men. The rate of SCC decreased over time in all racial/ethnic groups, and this was most pronounced in black persons (by 5.7% per year among men and 5.0% among women). The adenocarcinoma rate rose among non-Hispanic whites and among black men. Racial/ethnic disparities in the incidence of total esophageal cancer decreased over time, which was due mainly to reduced disparities in SCC. The 2 absolute disparity measures-range difference and between-group variance-for adenocarcinoma rose by 3.2% and 6.8% per year, respectively, in men and by 1.8% and 5.3% per year, respectively, in women. This study demonstrates decreased racial/ethnic disparities in the incidence of esophageal SCC over time in the United States, while disparities increased in adenocarcinoma incidence as measured on the absolute scale.
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