Low neighborhood socioeconomic status is associated with higher mortality and increased surgery utilization among metastatic breast cancer patients.

PURPOSE Low socioeconomic status (SES) is associated with advanced stage, lower-quality care, and higher mortality among breast cancer patients. The purpose of this study is to examine the association between neighborhood SES (nSES), surgical management, and disease-specific mortality in de novo metastatic breast cancer (MBC) patients in the Surveillance, Epidemiology, and End Results (SEER) Program. METHODS MBC patients ages 18 to 85+ years diagnosed from 2010 through 2016 were identified in SEER. The cohort was divided into low, middle, and high nSES based on the NCI census tract-level index. Univariable and multivariable analyses were used to examine the relationship between nSES, surgery, and disease specific mortality in MBC patients. RESULTS There were 24,532 de novo MBC patients who met study criteria, with 28.7 % undergoing surgery. Over the study period, surgery utilization decreased across all nSES groups. However, lower nSES was associated with a higher odds of undergoing surgery (low OR 1.25 [1.15-1.36] p < 0.001; middle OR 1.09 [1.01-1.18] p = 0.022; ref high). Living in an area with lower SES was associated with a worse disease specific mortality (low HR 1.24 [1.25, 1.44; ], middle 1.20 [1.1-1.29]: ref high). Specifically, there was a 9.26 month mean survival differences between the lowest (41.02 ± 0.47 months) and highest (50.28 ± 0.47 months) nSES groups. CONCLUSION These results suggest area of residence may contribute to differences in surgical management and clinical outcomes among de novo MBC patients. Future studies should examine the contributions of patient characteristics and preferences within the context of surgeon recommendations.