Table 1.

Clinical characteristics of 39 patients with pelvic osteosarcoma and data on tumor thrombus in the large draining veins on imaging by final consensus

Characteristic	Result (n=39)
Age at Diagnosis, years
Range	11–45
Median	19
Female: male ratio	23:16
Race
Caucasian	24
Hispanic	5
African	5
Asian	5
Tumor size at diagnosis or on first available scan within 6 months of diagnosis, cm
Range	4–18
Median	12.3
Subtype of osteosarcoma, n
Chondroblastic	20
Osteoblastic	8
Mixed	5
Small cell	1
Not otherwise specified	5
Patients who underwent surgical resection of the primary tumor, n	22
Patients with metastatic disease at presentation, n (%)	5 (23)
Tumor thrombus in the large draining veins on imaging, n (%)	10 (45)
Patients who did not undergo surgical resection of the primary tumor, n	17
Patients with metastatic disease at presentation, n (%)	14 (82)
Tumor thrombus in the large draining veins on imaging, n (%)	10 (59)