Table 1.

Demographics of the 675 patients

Variable	Value (% or range)
Gender
Male	299 (44%)
Female	376 (56%)
Median age, years (range)	60 (16–91)
Retroperitoneal location
Abdomen	556 (82%)
Pelvis	108 (16%)
Unknown	11 (2%)
Median tumor size, cm (range)	17 (2–139)
Radiation-associated	14 (2%)
Grade
Low	242 (36%)
High	431 (64%)
Number of organs resected
0	284 (42%)
1	207 (31%)
2	112 (16%)
3	39 (6%)
4	18 (3%)
≥5	15 (2%)
Histology*
Liposarcoma: well-differentiated & myxoid	186 (28%)
Liposarcoma: dedifferentiated, round cell & pleomorphic	213 (32%)
Low-grade leiomyosarcoma	18 (3%)
High-grade leiomyosarcoma	132 (20%)
Solitary fibrous tumor	33 (5%)
Malignant peripheral nerve sheath tumor	23 (3%)
Translocation-associated and other	34 (5%)
Not otherwise specified (NOS)	35 (5%)
Completeness of resection
Exploratory laparotomy only (no resection)	43 (6%)
R0	337 (50%)
R1	237 (35%)
R2	58 (9%)
Vascular resection performed	67 (10%)
Pre-operative radiation**	28 (4%)
Post-operative radiation	26 (4%)
Pre-operative chemotherapy**	73 (11%)
Post-operative chemotherapy	48 (7%)

MSKCC, Memorial Sloan Kettering Cancer Center;

^*One patient had an unresectable leiomyosarcoma of unknown grade.

^**Of the 89 patients (13%) who received pre-operative therapy, 16 (2%) received radiation only, 61 (9%) received chemotherapy only, and 12 (2%) received both.