Table III.

Clinicopathological factors and expression of PDGF-C and PDGF-D.

	PDGF-C expression, n			PDGF-D expression, n
Variables	Low (n=90)	High (n=114)	P-value	Low (n=53)	High (n=151)	P-value
Age, years			0.9			0.19
<70	60	75		39	96
≥70	30	39		14	55
Gender			0.59			0.02
Male	70	85		34	121
Female	20	29		19	30
Histopathology			0.05			<0.01
Differentiated	37	63		16	84
Undifferentiated	53	51		37	67
Depth of invasion			0.11			0.04
T1	44	43		29	58
T2/T3/T4	46	71		24	93
Lymph node metastasis			0.14			0.07
N0	55	58		35	78
N1/N2/N3	33	53		18	73
Recurrence			0.07			<0.01
Absent	73	80		49	104
Present	17	34			47
TNM stage			0.15			0.01
I	58	62		39	81
II/III	32	52		14	70

PDGF, platelet-derived growth factor; TNM, tumor-node-metastasis.