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Metastasis is the spread of a cancer/tumor from one organ to another organ, and it is the most dangerous stage in cancer progression, which causes more than 90% of cancer deaths. To improve the understanding of the complicated cellular mechanisms underlying, studies on the signaling pathways are required. To this end a metastasis pathway database, MetastasisWay, has been developed with the goal to store relations among genes, cancers, tissues and organ of metastasis mentioned in the large volume of literature and integrate them to construct a metastasis pathway through text-mining techniques. In light of the requirement to facilitate the curation process for pathway information, a METastasisway curation tool (MET) was developed as a Chrome browser extension which allows curators to review and edit concepts and relations related to metastasis directly in PubMed. PubMed users can view the metastatic pathways integrated from the large collection of research papers.