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Prepublished online as a Blood First Edition Paper on April 10, 2003; DOI 10.1182/blood-2003-02-0380.

Submitted February 4, 2003
Accepted April 1, 2003
Soluble receptor activator of nuclear factor B ligand (RANKL)/osteoprotegerin (OPG) ratio predicts survival in multiple myeloma. Proposal for a novel prognostic index
Evangelos Terpos*, Richard Szydlo, Jane F Apperley, Evdoxia Hatjiharissi, Marianna Politou, John Meletis, Nora Viniou, Xenophon Yataganas, John M Goldman, and Amin Rahemtulla
Department of Hematology, Hammersmith Hospital, Faculty of Medicine Imperial College, London, United Kingdom
Department of Hematology, Theagenion Cancer Center, Thessaloniki, Greece
First Department of Medicine, University of Athens School of Medicine, Athens, Greece
* Corresponding author; email: e.terpos{at}imperial.ac.uk.
Interaction between receptor activator of nuclear factor B ligand (RANKL) and RANK/osteoprotegerin (OPG) plays a dominant role in osteoclast activation and possibly in plasma cell survival in multiple myeloma (MM). We measured soluble RANKL (sRANKL), OPG, and bone remodelling markers in 121 newly diagnosed MM patients to evaluate their role in bone disease and survival. Serum levels of sRANKL were elevated in patients with MM and correlated with bone disease. The ratio sRANKL/OPG was also increased and correlated with markers of bone resorption, osteolytic lesions, and markers of disease activity. The ratio sRANKL/OPG, CRP and 2-microglobulin were the only independent prognostic factors predicting survival in multivariate analysis. We have generated a prognostic index based on these factors, which divides our patients into three risk groups. The low-risk group had a 96% probability of survival at five years while the intermediate-risk and the high-risk groups had probabilities of survival of 52% and 0% respectively. Not only do these results confirm for the first time in humans the importance of the sRANKL/OPG in the development of bone disease but they also highlight the role of this pathway in the biology of plasma cell growth as reflected by its influence on survival.

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