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Dickkopf-1 as a potential therapeutic target in Paget's disease of boneThis article discusses Dickkopf-1 (DKK-1), which is a soluble inhibitor of Wnt signalling and its excessive expression contributes to bone loss in rheumatoid arthritis and multiple myeloma. New therapeutics have been developed for treatment of these conditions that target DKK-1 expression. DKK-1 is elevated in serum of patients with Paget's disease of the bone (PDB) and evidence is accumulating for a role of DKK-1 in PDB. At present there is no cure for PDB and the current treatment of choice are bisphosphonates. These treat the resorptive phase of PDB but do not prevent its return. This article offers a new perspective on the aetiology of PDB and speculate on DKK-1 as a therapeutic target.