“…We included STS patients diagnosed from 2010 to 2018, according to the International Classification of Diseases for Oncology (ICD‐O) using the following SEER histology codes: 8800–8806, 8810–8811, 8813–8815, 8821–8822, 8825, 8830, 8832, 8835–8836, 8840–8842, 8850–8855, 8857–8858, 8860, 8890–8891, 8893–8897, 8901–8902, 8910, 8912, 8920–8921, 8983, 8990–8991, 9040–9044, 9120, 9124–9125, 9130, 9133, 9140, 9150, 9170, 9251–9252, 9540, 9560–9561, 9571, and 9580–9581. SEER employs an original histological grading system, so we defined SEER grade 1 as low‐grade tumor, and grade 2–4 as high‐grade tumor 18 . SEER *Stat software (version 8.3.9; National Cancer Institute) was used to obtain the information, and 47260 patients with STSs were identified.…”