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Cox proportional hazards model and PSM results of the association between chemotherapy use (A), multi-agent chemotherapy use (B), single-agent chemotherapy use (C), and neoadjuvant chemotherapy use (D) with OS in patients with primary high-grade extremity and trunk STS in the NCDB from 2004–2016. CI = confidence interval; HR = hazard ratio; NCDB = National Cancer Database; OS = overall survival; PSM = propensity score matching; STS = soft tissue sarcoma.
