The demographic features, clinicopathologic characteristics, treatment outcome and disease-specific prognostic factors of solitary fibrous tumor: a population-based analysis.

BACKGROUND Solitary fibrous tumor's (SFT) demographic features, clinicopathologic characteristics, treatment outcome and disease-specific prognostic factors were unexplored comprehensively. METHODS SEER program was used to identify patients diagnosed with SFT from 1973 to 2012. Overall collected data were analyzed by using the SPSS 18.0. RESULTS In total, 804 cases were found including 613 cases with SFT-specific mortality and 801 patients were analyzed for overall survival (OS). The 3-year disease specific survival (DSS), 5-year DSS and 10-year DSS were 73.3%, 65.7% and 53.3%. The 3-year OS, 5-year OS and 10-year OS were 71.9%, 63.3% and 47.3%. In the multivariate survival analysis, the age > 51 years (hazard ratio [HR] = 1.851 for DSS, P = 0.024 and HR = 1.652 for OS, P = 0.033; Reference [Ref] ≤ 51 years for DSS and ≤ 53 years for OS), SEER stage metastasized tumor (HR = 4.269 for DSS, P = 0.000 and HR = 2.905 for OS, P = 0.028, Ref - localized + regional tumor), pathologic grade III + IV (HR = 2.734 for DSS, P = 0.001 and HR = 2.585 for OS, P = 0.000, Ref - grade I + II) were adversely associated with DSS and OS. In addition, surgery was favorably associated with DSS (HR = 0.217, P = 0.045, Ref - surgery + radiotherapy). CONCLUSIONS The surgery was an independent prognostic factor for DSS. The patient's age, SEER stage and pathologic grade were SFT-specific independent prognostic indicators for DSS and OS.