BACKGROUND: Pancreatic cancer(PC) is usually diagnosed at the late-stage and therefore, has widespread metastasis and a very high mortality rate. The mechanisms underlying PC metastasis are not well understood. Recent advances in genomic sequencing have identified groups of gene mutations that affect PC metastasis, but studies elucidating their roles are lacking. The present review was to investigate the molecular mechanisms of PC metastasis.DATA SOURCES: Relevant articles on PC metastasis were searched in MEDLINE via Pub Med prior to April 2015. The search was limited in English publications.RESULTS: PC metastatic cascades are multi-factorial events including both intrinsic and extrinsic elements. This review highlights the most important genetic alterations and other mechanisms that account for PC invasion and metastasis, with particular regard to epithelial-mesenchymal transition, inflammation, stress response, and circulating tumor cells.CONCLUSIONS: Analyses of relevant gene functions and signaling pathways are needed to establish the gene regulatory network and to define the pivotal modulators. Another promising area of study is the genotyping and phenotyping of circulating tumor cells, which could lead to a new era of personalized therapy by identifying specific markers and targets. BACKGROUND: Pancreatic cancer (PC) is usually diagnosed at the late-stage and therefore, has widespread metastasis and a very high mortality rate. Recent advances in genomic sequencing have identified groups of gene mutations that affect PC metastasis, but studies elucidating their roles are lacking. The present review was to investigate the molecular mechanisms of PC metastasis. DATA SOURCES: Relevant articles on PC metastasis were searched in MEDLINE via Pub Med prior to April 2015. The search was limited in English publications.RESULTS: PC metastatic cascades are multi-factorial events including both intrinsic and extrinsic elements. This review highlights the most important genetic alterations and other mechanisms that account for PC invasion and metastasis, with particular regard to epithelial-mesenchymal transition, inflammation, stress response, and circulating tumor cells. CONCLUSIONS: Analyzes of relevant gene funct ions and signaling pathways are needed to establish the pivotal modulators. Another promising area of ​​study is the genotyping and phenotyping of circulating tumor cells, which could lead to a new era of personalized therapy by identifying specific markers and targets .