Table 4 Results of Cox regression analysis of the association between progression-free survival rates, and adjuvant treatment, perineural invasion, lymphovascular invasion, and disease stage in 386 patients with non-metastatic presentation

HR (95% CI)

Adjuvant Treatment

0.02

No

1

Yes

0.5 (0.36-0.69)

Perineural invasion

0.03

Absent

1

Present

1.31 (1.19-3.11)

Lymphovascular invasion

0.011

Absent

1

Present

2.1 (1.1-3.7)

Stage

0.001

Stage I

1

Stage II

1.6 (1.1 9-1.91)

Stage III

3.3 (1.67-5.89)