Effects of Neighborhood Deprivation Index on Survival in Gastroesophageal Adenocarcinoma.

Previous studies linked disadvantaged neighborhoods to poor cancer outcomes. The Neighborhood Deprivation Index (NDI) quantifies socioeconomic disadvantage, but its impact on gastroesophageal adenocarcinoma outcomes remains understudied. We conducted a retrospective analysis of 40,589 patients with esophageal or gastric adenocarcinoma from the SEER database (1996-2015), stratifying them by NDI: less disadvantaged (NDI < 60) and highly disadvantaged (NDI ≥ 60). Multivariate regression showed NDI ≥ 60 was independently associated with worse overall survival (OS) (HR 1.027, p = 0.017) and disease-specific survival (DSS) (HR 1.025, p = 0.04). Other predictors of poor OS and DSS included older age (≥60 years old), male sex, single marital status, lack of insurance, advanced stage/grade, and gastric tumor site. In contrast, Hispanic and non-Hispanic Black ethnicity, urban residence, and undergoing surgery were associated with better outcomes. Disadvantaged neighborhoods are linked to poorer survival in upper GI cancers, likely due to socioeconomic barriers. Addressing social determinants of health is crucial to reducing these disparities.