Table 3 Multivariate analysis of poor prognostic factors for OS in patients with pancreatic cancer

Age (years)

  ≤ 63

  > 63

0.107

Lymphovascular invasion

  No

Reference

  Yes

1.663

1.081–2.557

0.021

Grade

  Well/moderate

Reference

  Poor/undifferentiated

2.577

1.668–3.982

< 0.001

N stage

  N0

  N1

0.606

  N2

0.888

TNM stage

  I

Reference

  II

1.791

1.103–2.906

0.018

  III

4.313

2.365–7.865

< 0.001

Adjuvant chemotherapy

  No

Reference

  Yes

0.552

0.368–0.829

0.004

PIIN score

  ≤ 37.2

Reference

  > 37.2

2.171

1.207–3.906

0.010