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Haematologica, Vol 91, Issue 12, 1697-1700
Copyright © 2006 by Ferrata Storti Foundation

Comparative Study

Respiratory tract infections in the pathway to multiple myeloma: a population-based study in Scandinavia

O Landgren, JS Rapkin, L Mellemkjaer, G Gridley, LR Goldin, and EA Engels

Genetic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health & Human Services, Bethesda, MD 20892-7236, USA. landgreo@mail.nih.gov

Encounter with infectious antigens has been proposed to initiate the cascade of events associated with progression from premalignancy (monoclonal gammopathy of undetermined significance, MGUS) to multiple myeloma (MM). We conducted a population-based case-control study to evaluate risk of developing MM associated with a personal history of various respiratory tracts infections occurring >1 year prior to MM. Inpatient (1977-1997) and outpatient (1994-1997) diagnoses were obtained for all MM patients (n=4,476) diagnosed in Denmark (1977-1997) and 16,727 matched controls. A personal history of pneumonia was associated with a 1.6-fold (95%CI 1.3-2.0) increased risk of MM; the elevated risk was restricted to 1-4.99 years prior to the diagnosis of MM (OR=1.7,95%CI 1.3-2.2). Individuals with two and three or more previous episodes of pneumonia had a 1.7-fold (95%CI 1.0-3.0; p=0.05) and a 1.5-fold (95%CI 0.6-3.9) elevated MM risk, respectively. Pneumonia could be a trigger to the development of MM or a manifestation of immune disturbances in late-stage MGUS.


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