Table 1. Clinical baseline data and score grouping of 53 patients with OSs in GES21257 dataset.

Clinical features	Cases, n (%)	High 3-GRM score group, n (%)	Low 3-GRM score group, n (%)	P*
Patients(n)	53	28	25
Median age(range)	17 (14-19)	16.5(14-19)	17(13-19)	0.71
Gender
Female	19 (35.8)	7 (25.0)	12 (48.0)	0.08
Male	34 (64.2)	21 (75.0)	13 (52.0)
Histological Subtype
Osteoblastic	32 (60.4)	19 (67.9)	13 (52.0)	0.24
Others	21 (39.6)	9 (32.1)	12 (48.0)
Tumor location
Lower limb	44 (83.0)	23 (82.1)	21 (87.5)	0.88
upper limb	8 (15.1)	5 (17.9)	3 (12.5)
Unknow	1(1.89)	-	-
Huvos grade
I-II	29 (54.7)	14 (58.3)	15 (65.2)	0.85
III-IV	18 (34.0)	10 (41.7)	8 (34.8)
Unknow	6(11.3)	-	-
Metastases at diagnosis
No	39 (73.6)	20 (71.4)	19 (76.0)	0.95
Yes	14 (26.4)	8 (28.6)	6 (24.0)

*Comparison of high 3-GRM score group and low 3-GRM score group.