Denosumab is a human monoclonal antibody (IgG2) produced in a mammalian cell line (Chinese hamster ovary cells) using recombinant DNA technology, targeting RANKL, to which the drug binds with high affinity and specificity, preventing the activation of its receptor RANK on the surface of osteoclast precursors and osteoclasts. Prevention of RANKL/RANK interaction inhibits osteoclast formation, function and viability, thereby reducing the resorption of both tubular and cancellous bones.