Table S2. Factors associated with visceral metastasis.

Variable	Number	Visceral metastasis (%)	χ2 value	P value	OR	95% CI	Cramer’s V v (P value)
PT2	28	89.30	6.447	0.03			0.204 (0.037)
PT3	60	83.30
PT4	63	96.80
PT2 vs. PT3				0.68
PT2 vs. PT4				0.17
PT3 vs. PT4			6.354	0.012	6.1	1.28–29.13	0.23 (0.012)
Local recurrence	56	98.20	5.69	0.02	8.37	1.07–65.41	0.19 (0.02)
No local recurrence	106	86.80
Lymph node metastasis	94	84	11.958	0.001			0.27 (0.001)
No lymph node metastasis	68	100
Lymph node dissection	123	88	3.89	0.049			0.18 (0.022)
No lymph node dissection	39	100
Bone metastasis
PT2	28	35.70	6.422	0.04			0.21 (0.04)
PT3	60	23.30
PT4	63	12.70
PT2 vs. PT3				0.22
PT2 vs. PT4			6.471	0.01	0.26	0.09–0.76	0.27 (0.01)
PT3 vs. PT4				0.12
Liver metastasis
PT2	28	42.90	8.789	0.01			0.241 (0.01)
PT3	60	25.00
PT4	63	14.30
PT2 vs. PT3				0.09
PT2 vs. PT4			8.914	0.003	0.22	0.08–0.62	0.31(0.003)
PT3 vs. PT4				0.13
Lymph node metastasis
LVI
1	69	18.80	6.066	0.048			0.203 (0.048)
2	44	36.40
3	34	38.20
1 vs. 2			4.324	0.04	0.41	0.172–0.961	0.20 (0.038)
1 vs. 3			4.54	0.03	0.375	0.15–0.94	0.21 (0.03)
2 vs. 3				0.865
Local recurrence
1		23.2	13.244	0.001			0.3 (0.001)
2		43.2
3		58.8
1 vs. 2			5.023	0.03	0.4	0.18–0.90	0.211 (0.03)
1 vs. 3			12.722	<0.001	4.73	1.96–11.44	0.35 (0.000)
2 vs. 3				0.17
Lymph node metastasis
1		36.20	20.212	P<0.001			0.371 (<0.001)
2		59.10
3		82.40
1 vs. 2			5.669	0.017	2.542	1.17–5.523	0.224 (0.017)
1 vs. 3			19.396	P<0.001	8.213	2.994–22.532	0.434 (<0.001)
2 vs. 3			4.872	0.027	3.231	1.111–9.391	0.25 (0.027)

LVI, lymphovascular invasion.