Table-I.

General characteristics of osteosarcoma subjects

Age at diagnosis, y	Patients, N	%
Median (range)	24.6±8.2
≤20	140	53.44
＞20	122	46.56
Sex
Male	163	62.21
Female	99	37.79
Tumor location
Upper limb	109	41.60
Lower limb	153	58.40
Metastasis
Yes	98	37.40
No	164	62.60
Therapy
Amputation	110	41.98
Limb salvage	152	58.02
Death
No	146	55.73
Yes	116	44.27
Chemotherapy
Good	137	52.29
Poor	125	47.71