Table 2 Results of Cox regression analysis of the association between overall survival rates, and perineural invasion, lymphovascular invasion, and disease stage in 386 patients with non-metastatic presentation

HR (95% CI)

Adjuvant Treatment

0.01

No

1

Yes

0.4 (0.26 to 0.6)

Perineural invasion

0.043

Absent

1

Present

1.67 (1.08 to 2.78)

Lymphovascular invasion

0.021

Absent

1

Present

2.8 (1.2 to 6.6)

Stage

0.001

Stage I

1

Stage II

1.4 (1.09 to 1.71)

Stage III

3 (1.57 to 5.87)

≤70 years

0.03

1

>70 years

1.27(1.17 to 1.48)