“…Generally, soft-tissue sarcomas have a 50–60% survival rate ( 30 ), whereas the 5-year survival rate for angiosarcoma is <40% ( 12 , 25 , 31 , 32 ). Several factors are reportedly associated with poor survival: older age ( 25 , 32 ), worse performance status ( 33 , 34 ), larger tumor size ( 5 , 8 , 20 , 32 , 35 – 40 ), positive margin status ( 31 , 32 , 38 , 41 , 42 ), higher histologic type or grade ( 32 , 37 , 41 , 43 , 44 ), scalp as the primary location ( 5 , 36 , 45 ), deeper location of the tumor ( 20 , 31 ), and presence of distant metastasis ( 33 , 38 , 41 , 46 ). On the other hand, the following factors were associated with favorable prognosis: surgery ( 20 , 34 ), multimodal therapy ( 5 , 39 , 41 ) and postoperative radiotherapy ( 34 , 36 , 41 , 43 , 47 , 48 ).…”