DDR1 and cancer: Association of DDR1 with collagen III but not collagen I promotes cancer cell dormancy, indicating that the association of DDR1 with distinct collagens can induce differential cellular responses.[35] The function of DDR1 with its ligands collagen III and collagen V are particularly relevant in RMS, as we found that their gene expression is associated with favorable prognosis and their expression negatively correlates with DDR1 gene expression.