Table I.

Correlation of the expression of E2F1 and DDR1 with clinicopathological features in osteosarcoma.

Characteristics	Cases	E2F1 expression			DDR1 expression
		Low cases	High cases	P-value	Low cases	High cases	P-value
	81	45	36		44	37
Sex				0.8542			0.4856
Male	40	22	18		19	21
Female	41	23	18		25	16
Age (years)				0.6425			0.2489
<30	62	35	27		31	31
≥30	19	10	9		13	6
Tumor size (cm)				0.1462			0.0611
<5	53	30	23		34	19
≥5	28	15	13		10	18
Grade				0.0157a			0.0019a
Low	16	12	4		15	1
High	65	33	32		29	36
TNM				0.0101a			0.0034a
I	8	8	0		8	0
II	42	24	18		28	24
III	21	12	9		8	13
IV	10	1	9		0	10
Histological type				0.1601			0.2193
Osteoblastic	29	17	12		14	15
Fibroblastic	6	4	2		5	1
Chondroblastic	30	16	14		15	15
Others	16	8	8		10	6
Metastasis				0.0009a			0.0002a
Yes	10	1	9		0	10
No	71	44	27		44	27

^aP<0.05.