Table 2.

Association between B7-H4 expression and clinicopathological features of 104 OS patients.

Characteristics	Cases	B7-H4 expression		P value
	(104)	Low (31)	High (73)
Age (years)
≤20	60	18	44
>20	44	13	29	0.834
Gender
Male	54	15	40
Female	50	16	33	0.549
Tumor site
Femur/tibia	67	20	49
Others	37	11	24	0.797
Tumor stage
I + II	62	24	29
III	42	7	44	0.000
Distant metastasis
Yes	41	13	47
No	63	18	26	0.034
Differentiation status
High	76	25	52
Low	28	6	21	0.317