Stereotactic body radiotherapy for recurrent and oligometastatic soft tissue sarcoma

Table 1 Patient and tumor characteristics

Patient-related variables (n = 37)	Patients, n (%)
Age: median (range)	58 years(19–82 years)
Gender
Male	25(67.6%)
Female	12(32.4%)
Pathological type
Smooth muscle tumors	5(13.5%)
Fibroblastic and myofibroblastic tumors^a	11(29.7.4%)
Tumors of uncertain differentiation^b	8(21.6%)
Adipocytic tumors^c	5(13.5%)
Vascular tumors	3(8.1%)
Skeletal muscle tumors	3(8.1%)
Others	2(5.4%)
Disease setting
Recurrence	18(48.6%)
Oligometastasis	19(51.4%)
Histological grade*
G1	19(51.4%)
G2	4(10.8%)
G3	14(37.8%)
Number of lesions^d
1	24(64.8%)
2–3	13(35.1%)
Systemic treatment
Chemotherapy	18(48.6%)
Targeted therapy	4(10.8%)
Immunotherapy	1(2.7%)
Interventional therapy	2(5.4%)
None	12(32.4%)

^a11 cases of fibroblastic and myofibroblastic tumors including 5 cases of myxofibrosarcoma, 2 cases of fibrosarcoma NOS, 1 case of inflammatory myofibroblastic tumor, 1 case of solitary fibrous tumor, malignant, 1 case of desmoid-type fibromatosis, and 1 dermatofibrosarcoma protuberans
^b8 cases of tumors of uncertain differentiation including 3 cases of undifferentiated sarcoma, 1 case of spindle cell sarcoma, undifferentiated, 1 cases of pleural mesothelial sarcoma, 1 case of endometrial stromal sarcoma, 1 case of alveolar soft part sarcoma, 1 case of synovial sarcoma
^c5 cases of adipocytic tumors including 3 cases of dedifferentiated liposarcoma, 2 cases of myxoid liposarcoma
^dNumber of concurrent lesions at the time of first SBRT
*Histological grade was based on the pathological findings of the primary site at the time of initial diagnosis

ISSN: 1477-7819