Expression Status of PIWIL1 as a Prognostic Marker of Colorectal Cancer

Table 1

Association between PIWIL1 overexpression and clinicopathologic characteristics.

Characteristics	Number	PIWIL1 expression		^a
		Low (%)	High (%)
Age (years)				0.477
<60	57	22 (47.8)	35 (54.7)
≥60	53	24 (52.2)	29 (45.3)
Sex				0.350
Male	56	21 (45.7)	35 (54.7)
Female	54	25 (54.3)	29 (45.3)
Tumor size				0.528
<5 cm	44	20 (43.5)	24 (37.5)
≥5 cm	66	26 (56.5)	40 (62.5)
TNM stage				0.007
I	23	14 (30.4)	9 (14.1)
II	42	19 (41.3)	23 (35.9)
III	34	11 (23.9)	23 (35.9)
IV	11	2 (4.3)	9 (14.1)
Differentiation				0.017
Well	31	18 (39.1)	13 (20.3)
Moderate	47	19 (41.3)	28 (43.8)
Poor	32	9 (19.6)	23 (35.9)
Infiltrate depth				0.002
T1 + T2	43	26 (56.5)	17 (26.6)
T3 + T4	67	20 (43.5)	47 (73.4)
Lymphovascular invasion				0.012
No	61	32 (69.6)	29 (45.3)
Yes	49	14 (30.4)	35 (54.7)
Lymph node metastasis				0.032
No	71	35 (76.1)	36 (56.3)
Yes	39	11 (23.9)	28 (43.8)
Tumor location				0.383
Rectum	58	22 (47.8)	36 (56.3)
Colon	52	24 (52.2)	28 (43.8)

LNM: lymph node metastasis; TNM: tumor node metastasis; ^achi-square test.