Table 4 Multivariate analyses of the potential predictors of lymph node metastasis

PDC grade

0.004

 G 1

Reference

 G 2

0.026 (< 0.001, 2.313)

0.111

 G 3

0.001 (< 0.001, 0.139)

0.007

Depth of submucosal invasion

0.034

 > 1 mm

Reference

 ≤ 1 mm

23.205 (1.266, 425.177)

Stratification of submucosal invasion

0.095

 SM 1

Reference

 SM 2

71.683 (0.476, 10,786.720)

TB grade

0.106

 Bd 1

Reference

 Bd 2

1.509 (0.139, 16.376)

0.735

 Bd 3

0.040 (0.001, 1.082)

0.056

PNI

0.039

 Absence

Reference

 Presence

0.078 (0.007, 0.882)

LVI

0.017

 Absence

Reference

 Presence

0.061 (0.006, 0.609)