Table S1.

Adjustment for potential confounders of the seven included studies assessed with multivariate analysis

Study	CA199	NLR	mGPS	Albumin	CRP	ECOG	Stage	Tumor size	Nodal involvement	Margin status	Tumor differentiation	Age	Gender
Martin et al 201410	√	√	√	√	√	√
Qi et al 201511	√						√
Goh et al 20156		√
Shirai et al 20152		√						√	√	√	√
Spolverato et al 20153		√						√	√	√		√	√
Asari et al 20165	√	√	√	√						√
Watanabe et al 201614		√

Abbreviations: CRP, C-reactive protein; ECOG, Eastern Cooperative Oncology Group; mGPS, modified Glasgow Prognostic Score; NLR, neutrophil-to-lymphocyte ratio.