Table 1.

Baseline patient and tumor characteristics.

Osteosarcoma N=31
Age at diagnosis
Median (Range)	16.0 (5.0–59.0 years)
Gender
Male	17 (54.8%)
Female	14 (45.2%)
Histology Subtypes at diagnosis
Common subtypes (Osteoblastic, Fibroblast, and Chondroblast types)	28 (90.3%)
Small cell subtype	1 (3.2%)
Giant cell malignancy transformation into osteosarcoma	2 (6.5%)
Primary site
Distal femur	13 (41.9%)
Distal radius	1 (3.2%)
Proximal tibia and femula	8 (25.8%)
Proximal femur	2 (6.5%)
Proximal humerus	4 (12.9%)
Pelvic	2 (6.5%)
Cervical vertebra	1(3.2%)
Stage at diagnosis
II A	1 (3.2%)
II B	22 (71.0%)
III	8 (25.8%)
Surgical margins achieved
Wide/Radical	16 (51.6%)
Marginal	15 (48.4%)