Methods:
We collected clinical data regarding patients aged <18 years with SYST treated at Sun Yat-sen University Cancer Center between 2007 and 2018. We investigated prognostic factors of age, stage, initial tumor size, pathological response to neoadjuvant chemotherapy and alfa fetoprotein (AFP) in univariate and multivariate analysis. The Kaplan-Meier method was used to estimate the relapse-free survival (RFS).