Table 3. Univariate and multivariate analyses for overall survival.

Variable	Univariate analysis	Multivariate analysis
Age (ref: yRC)	P=0.235	P=0.267
Gender (ref: male)	P=0.606	P=0.354
Post-operative N stage	P=0.020, HR 1.53, 95% CI: 1.07–2.18	P=0.001, HR 2.85, 95% CI: 1.56–5.21
Histopathology (ref: mucinous)	P=0.103	P=0.363
LVI	P=0.082	P=0.672
PNI	P=0.006, HR 2.82, 95% CI: 1.35–5.88	P=0.373
Lack of adjuvant chemotherapy	P=0.001, HR 2.72, 95% CI: 1.51–4.90	P<0.0001, HR 6.45, 95% CI: 2.59–16.08