Table 1.
Histologic categories.
| Histologic category used in analysis | Histologic subtypes reported in the medical record | Corresponding WHO histologic category and subtypesa |
|---|---|---|
| Leiomyosarcoma | Smooth-muscle tumor and uterine leiomyosarcoma | Smooth-muscle tumor (i.e., leiomyosarcoma and leiomyoma of deep soft tissue) |
|
| ||
| Fibroblastic/myofibroblastic sarcoma | Fibroblastic/myofibroblastic sarcoma | Fibroblastic/myofibroblastic sarcoma (i.e., fibrosarcoma, myxofibrosarcoma, low-grade fibromyxoid sarcoma, and sclerosing epithelioid fibrosarcoma) |
|
| ||
| Liposarcoma | Adipocytic tumor | Adipocytic tumor (i.e., dedifferentiated liposarcoma, myxoid liposarcoma, and pleomorphic liposarcoma) |
|
| ||
| Vascular sarcoma | Vascular tumor of soft tissue and angiosarcoma | Vascular tumor (epithelioid hemangioendothelioma and angiosarcoma of soft tissue) |
|
| ||
| Rhabdomyosarcoma | Skeletal-muscle tumor | Skeletal-muscle tumor (i.e., rhabdomyosarcoma, including embryonal, alveolar, and pleomorphic forms, and spindle cell/sclerosing rhabdomyosarcoma) |
|
| ||
| Synovial sarcoma | Synovial sarcoma | Tumor of uncertain differentiation: synovial sarcoma |
|
| ||
| Others or not otherwise specified (NOS) | Chondro-osseous tumor, fibrohistiocytic tumor, pericytic tumor, nerve sheath tumor, tumor of uncertain differentiation, and undifferentiated/unclassified sarcoma | Not applicable So-called fibrohistiocytic tumor Perivascular tumor Chondro-osseous tumor Nerve sheath tumor Tumor of uncertain differentiation (unless otherwise notedb) Undifferentiated/unclassified tumor |
WHO: World Health Organization; aaccording to the WHO classification of tumours of soft tissue and bone [8]; bsynovial sarcoma, classified under “Tumours of uncertain differentiation,” was included in a separate histologic category for the analyses.