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Table 1. Age Distribution of Soft Tissue Sarcomas (STSs) in Children Aged 0 to 19 Years (SEER 1975–2008)

 Age <5 y Age 5–9 y Age 10–14 y Age 15–19 y % of the Total Number of STS Cases <20 y 
All soft tissue and other extraosseous sarcomas 1,130 810 1,144 1,573 100
Rhabdomyosarcomas 710 466 364 350 41
Fibrosarcomas, peripheral nerve, and other fibrous neoplasms 151 64 132 192 12
Fibroblastic and myofibroblastic tumors 1313157866.5
Nerve sheath tumors 1932741045
Other fibromatous neoplasms 11120.1
Kaposi sarcoma 1 2 0 12 0.3
Other specified soft tissue sarcomas 198 220 512 856 38
Ewing tumor and Askin tumor of soft tissue 222857814
pPNET of soft tissue 211929422.4
Extrarenal rhabdoid tumor 373831
Liposarcomas 5622662
Fibrohistiocytic tumors a 536917129312
Leiomyosarcomas 131922572.4
Synovial sarcomas 12391332048.3
Blood vessel tumors 15711331.4
Osseous and chondromatous neoplasms of soft tissue 159160.6
Alveolar soft parts sarcoma 3719261
Miscellaneous soft tissue sarcomas 161831352
Unspecified soft tissue sarcomas 70 58 136 163 9

pPNET = peripheral primitive neuroectodermal tumors; SEER = Surveillance Epidemiology and End Results.
aDermatofibrosarcoma accounts for 75% of these cases.