Table 3 Univariate and multivariate analysis of prognostic factors for overall survival

0 + IA + IB

IIA

IIB

III + IV

1.0 (reference)

1.159 (0.714–1.881)

1.356 (0.854–2.151)

3.035 (1.301–7.081)

0.549

0.196

0.010

1.0 (reference)

5.705 (1.929–16.88)

6.270 (2.160–18.20)

11.10 (3.012–40.92)

1.650e–03

7.361e–04

2.985e–04

Age

1.025 (0.998–1.053)

0.067

1.024 (0.996–1.052)

0.086

Gender

1.249 (0.771–2.023)

0.366

1.236 (0.759–2.012)

0.393

CCDC88A expression

0.497 (0.295–0.836)

0.008

0.519 (0.306–0.877)

0.014

Diameter of primary tumor

1.338 (1.176–1.524)

1.045e–05

Histology^b

1.383 (0.846–2.261)

0.1965

Lymphatic invasion^b

(ly0 + ly1 or ly2 + ly3)

1.269 (0.751–2.145)

0.3733

Venous invasion^b

(v0 + v1 or v2 + v3)

1.928 (1.034–3.593)

0.0388

Intrapancreatic nerve invasion^b (n0 + n1 or n2 + n3)

1.500 (0.947–2.377)

0.0839