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Blood, 15 September 2006, Vol. 108, No. 6, pp. 1979-1983. Prepublished online as a Blood First Edition Paper on June 1, 2006; DOI 10.1182/blood-2006-04-015784. This Article Full Text (PDF) All Versions of this Article: blood-2006-04-015784v1 108/6/1979    most recent Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Dingli, D. Articles by Katzmann, J. A Search for Related Content PubMed PubMed Citation Articles by Dingli, D. Articles by Katzmann, J. A Social Bookmarking                   What's this?  Previous Article  |  Next Article  Submitted April 10, 2006 Accepted April 13, 2006 Immunoglobulin free light chains and solitary plasmacytoma of bone David Dingli, Robert A Kyle*, S V Rajkumar, Grzegorz S Nowakowski, Dirk R Larson, John P Bida, Morie A Gertz, Terry M Therneau, L J Melton, III, Angela Dispenzieri, and Jerry A Katzmann Division of Hematology, Mayo Clinic College of Medicine, Rochester, MN, USA Department of Health Sciences Research, Mayo Clinic College of Medicine, Rochester, MN, USA Department of Laboratory Medicine and Pathology, Mayo Clinic College of Medicine, Rochester, MN, USA * Corresponding author; email: kyle.robert{at}mayo.edu. An abnormal serum immunoglobulin free light (FLC) ratio at diagnosis may identify risk of progression to myeloma in patients with solitary bone plasmacytoma (SBP). In the cohort of 116 patients, 43 have progressed to myeloma; with a median time to progression of 1.8 years. The FLC ratio was determined in all 116 patients on serum collected at time of diagnosis, and was abnormal in 54 patients (47%). An abnormal FLC ratio was associated with a higher risk of progression to myeloma (p=0.039). The risk of progression at 5 years was 44% in patients with an abnormal serum FLC ratio at diagnosis compared to 26% in those with a normal FLC ratio. One to two years following diagnosis, a persistent serum M protein 0.5gm/dL was an additional risk factor for progression. A risk stratification model was constructed using these two variables: patients with a normal FLC ratio at baseline and M protein <0.5gm/dL one to two years following diagnosis (low-risk; n=31), either risk factor abnormal (intermediate-risk, n=26), and both an abnormal FLC ratio and M protein 0.5gm/dL (high-risk, n=18). The corresponding progression rates at 5 years were significantly different in the 3 groups, 13%, 26%, and 62%, respectively, P < 0.001. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: A. Dispenzieri, L. Zhang, J. A. Katzmann, M. Snyder, E. Blood, R. DeGoey, K. Henderson, R. A. Kyle, M. M. Oken, A. R. Bradwell, et al. Appraisal of immunoglobulin free light chain as a marker of response Blood, May 15, 2008; 111(10): 4908 - 4915. [Abstract] [Full Text] [PDF] A. Dispenzieri, R. A. Kyle, J. A. Katzmann, T. M. Therneau, D. Larson, J. Benson, R. J. Clark, L. J. Melton III, M. A. Gertz, S. K. Kumar, et al. Immunoglobulin free light chain ratio is an independent risk factor for progression of smoldering (asymptomatic) multiple myeloma Blood, January 15, 2008; 111(2): 785 - 789. [Abstract] [Full Text] [PDF]

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