Table 1.

Clinical characteristics of all the 6 patients with osteosarcoma

Case	Karnofsky performance status score	Gender	Age/year	Tumor site	Tumor size(cm)	Enneking's surgical staging	Pathological fracture	Surgical procedure	Neoadjuvant chemotherapy	Local recurrence	Metastasis
Patient1	40	F	11	Extremities	6.5*13.5	III	no	limb salvage	yes	no	yes
Patient2	90	M	17	Extremities	8.8*6.1	II	no	limb salvage	yes	no	no
Patient3	50	F	16	Extremities	8.8*13	II	no	limb salvage	yes	no	no
Patient4	90	F	33	Extremities	11*4.8*3.7	II	no	limb salvage	yes	no	no
Patient5	50	F	8	Extremities	6.3*10.5	III	no	limb salvage	yes	no	yes
Patient6	90	F	53	Extremities	5*3.9*5.3	II	no	limb salvage	yes	no	no

F=female, M=male