Table 2. Univariate analysis for the association between clinical characteristics and survival in metastatic PDAC patients.

Variables	Category	n	Univariate analysis
			HR	95% CI	P value
PLR	≤123	57	1
	>123	77	1.581	1.092–2.287	0.015*
Age	–		1
	Increasing		1.003	0.981–1.025	0.787
Gender	Male	89	1
	Female	45	0.603	0.411–0.886	0.010*
KPS	90	111	1
	80	19	1.103	0.673–1.809	0.696
	70	4	2.480	0.904–6.803	0.078
Location	Head	44	1
	Body/tail	90	1.150	0.786–1.684	0.471
Chemotherapy	Monotherapy	42	1
	Combined therapy	92	0.595	0.407–0.870	0.007**

*, P<0.05; **, P<0.01. PDAC, pancreatic ductal adenocarcinoma; HR, hazards ratio; PLR, platelet to lymphocyte ratio; KPS, Karnofsky Performance Status.