Table 2 Multivariate Cox regression analysis of histopathologic factors in 92 patients with pancreatic cancer

R-status (R1vs R0)

0.87

1.038

0.65 - 1.65

Vascular invasion (Involved vs non- involved)

0.455

1.208

0.74 - 1.98

Perineural infiltration (Involved vs non- involved)

0.359

1.369

0.70 - 2.68

Tumour size (> 20 mm vs ≤ 20 mm)

0.315

1.434

0.71 - 2.90

COX-2 expression (Negative vs Positive)

0.047

1.642

1.01 - 2.68

Lymph node ratio (LNR) (> 0.2 vs ≤ 0. 2)

0.032

1.757

1.05 - 2.94