Number of evaluated lymph nodes and positive lymph nodes, lymph node ratio, and log odds evaluation in early-stage pancreatic ductal adenocarcinoma: numerology or valid indicators of patient outcome?

Table 2 Predictive factors of survival following PD for PDAC multivariate analysis

Prognostic factor	HR	95 % CI	p value
Age > 70 years	1.19	0.77–1.55	0.1
Tumor size > 3 cm	1.29	1.05–4.05	0.01
Tumor differentiation
Well	1.00
Moderate	1.23	0.67–3.79	0.26
Poor	1.58	1.14–3.38	0.02
R1 resection	1.41	1.03–6.77	0.05
Lymph node metastasis	3.47	1.50–7.36	0.001
ELN	1.07	0.89–4.75	0.83
PLN	1.39	1.03–6.22	0.12
LNR	0.97	0.71–3.98	0.35
LODDS	1.62	1.11–2.49	0.09
Perineural invasion	1.12	0.63–1.71	0.34
Microvascular invasion	0.97	0.72–1.44	0.48

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