The proto-oncogene receptor d’origine nantais (RON, MST1R) is a transmembrane tyrosine kinase receptor for macrophage-stimulating protein (MSP) that crucially regulates cell motility, adhesion, proliferation, apoptosis, and epithelial-to-mesenchymal transition (EMT) in various tumor biological processes. Here, MST1 is linked to neoplasm.