DDR1 and breast carcinoma: Currently, miR-199b-5p was known to accelerate cell proliferation by targeting DDR1 in breast cancer.33 Previously, miR-199b-5p hindered OD in ligamentum flavum cells by targeting JAG1.28 As opposed to a previous study,28 ours found that miR-199b-5p overexpression elevated the expression of osteogenic markers.