A multi‐institutional validation study of prognostic nomograms for retroperitoneal sarcoma

Background and Objectives Prognostic nomograms for patients undergoing resection of retroperitoneal sarcoma (RPS) include the Sarculator and Memorial Sloan Kettering (MSK) sarcoma nomograms. We sought to validate the Sarculator and MSK nomograms within a large, modern multi‐institutional cohort of patients with primary RPS undergoing resection. Methods Patients who underwent resection of primary RPS between 2000 and 2017 across nine high‐volume...