Lymphocyte-to-monocyte ratio in pancreatic cancer: Prognostic significance and meta-analysis

•Several studies have investigated the prognostic value of the LMR in various types of cancer.•We investigated its prognostic value of pretreatment LMR in PC.•The results showed that low LMR could predict unfavorable OS and DFS/RFS.•We therefore conclude that low pretreatment LMR was associated with advanced clinicopathological features and poor prognosis as a predicative factor in patients with PC.