Disparities in Survival and NCCN Guideline–Concordant Care in Patients With Extremity Soft Tissue Sarcoma

Background: Based on the NCCN Guidelines for Soft Tissue Sarcoma (STS), treatment of extremity STS (ESTS) includes radiation therapy (RT) and surgical resection for tumors that are high-grade and .5 cm. The aim of this study was to describe the association between neighborhood socioeconomic status (nSES), concordance with NCCN Guidelines recommendations, and outcomes in patients with ESTS. Methods: Patients with ESTS diagnosed from 2006 through 2018 were identified in SEER registries. The analytic cohort was restricted to patients with high-grade tumors .5 cm without nodal or distant metastases who received limb-sparing surgery. Patient demographics and tumor characteristics associated with receipt of RT were analyzed using adjusted regression analyses. Kaplan-Meier curves and adjusted accelerated failure time models were used to examine disparities in cancer-specific survival. Results: Of 2,249 patients, 29.0% (n5648) received neoadjuvant RT, 49.7% (n51,111) received adjuvant or intraoperative RT, and 21.3% (n5476) did not receive RT. In adjusted analyses, lower nSES was associated with lower likelihood of receiving RT (odds ratio, 0.70 [95% CI, 0.57–0.87]; P,.001). Low nSES was associated with worse cancer-specific survival (hazard ratio, 1.19 [95% CI, 1.01–1.40]; P 5.04). Race and ethnicity were not significant predictors of receipt of RT or cancer-specific survival in the fully adjusted models. Conclusions: Patients from lower nSES areas were less likely to receive NCCN Guideline–recommended RT for their ESTS and had worse cancer-specific survival. Efforts to better define and resolve disparities in the treatment and survival of patients with ESTS are warranted.