NCIt definition : A humanized monoclonal antibody directed against macrophage colony-stimulating factor
(M-CSF) with potential anti-osteolytic activity. Lacnotuzumab binds to M-CSF and blocks
M-CSF-mediated signaling through the M-CSF receptor CD116 expressed on osteoclasts,
which may result in inhibition of M-CSF-induced osteoclast differentiation and so
osteoclastic bone resorption. Osteoclasts are derived through the fusion of cells
of the monocyte/macrophage lineage. Osteoblasts and stromal cells may react to bone
metastases by producing M-CSF and its osteoclastogenic cofactor RANKL (receptor activator
of NF-kappaB ligand).;