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Original Article
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Volume 349:1324-1332 October 2, 2003 Number 14
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Characteristics of Hodgkin's Lymphoma after Infectious Mononucleosis
Henrik Hjalgrim, M.D., Johan Askling, M.D., Klaus Rostgaard, M.Sc., Stephen Hamilton-Dutoit, F.R.C.Path., Morten Frisch, M.D., Jin-Song Zhang, M.D., Mette Madsen, M.Sc., Nils Rosdahl, M.D., Helle Bossen Konradsen, M.D., Hans H. Storm, M.D., and Mads Melbye, M.D.

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ABSTRACT

Background Infectious mononucleosis–related Epstein–Barr virus (EBV) infection has been associated with an increased risk of Hodgkin's lymphoma in young adults. Whether the association is causal remains unclear.

Methods We compared the incidence rates of Hodgkin's lymphoma in two population-based Danish cohorts of patients who were tested for infectious mononucleosis: 17,045 with serologic evidence of having had acute EBV infection, and 24,614 with no such evidence. We combined the cohort of patients who had serologically verified infectious mononucleosis with a cohort of 21,510 Swedish patients with infectious mononucleosis (combined total, 38,555). Biopsy specimens of Hodgkin's lymphomas occurring during follow-up in this combined cohort were tested serologically for the presence of EBV. Using this information, we modeled the relative risk of EBV-negative and EBV-positive Hodgkin's lymphoma in different periods after the diagnosis of infectious mononucleosis and estimated the median incubation time for mononucleosis-related EBV-positive Hodgkin's lymphoma.

Results Only serologically confirmed infectious mononucleosis was associated with a persistently increased risk of Hodgkin's lymphoma. Sixteen of 29 tumors (55 percent), obtained from patients with infectious mononucleosis, had evidence of EBV. There was no evidence of an increased risk of EBV-negative Hodgkin's lymphoma after infectious mononucleosis. In contrast, the risk of EBV-positive Hodgkin's lymphoma was significantly increased (relative risk, 4.0; 95 percent confidence interval, 3.4 to 4.5). The estimated median incubation time from mononucleosis to EBV-positive Hodgkin's lymphoma was 4.1 years (95 percent confidence interval, 1.8 to 8.3).

Conclusions A causal association between infectious mononucleosis–related EBV infection and the EBV-positive subgroup of Hodgkin's lymphomas is likely in young adults.


Source Information

From the Departments of Epidemiology Research (H.H., K.R., M.F., M. Melbye) and Respiratory Infections, Meningitis, and STDs, Microbiology, and Diagnostics (H.B.K.), Statens Serum Institut; the Danish Institute for Public Health (M. Madsen); the Medical Office of Health, City of Copenhagen (N.R.); and the Department of Cancer Prevention and Documentation, Danish Cancer Society (H.H.S.) — all in Copenhagen, Denmark; the Clinical Epidemiology Unit, Department of Medicine, Karolinska Institute and Hospital, Stockholm, Sweden (J.A.); and the Institute of Pathology, Aarhus University Hospital, Aarhus, Denmark (S.H.-D., J.-S.Z.).

Address reprint requests to Dr. Hjalgrim at the Department of Epidemiology Research, Danish Epidemiology Science Centre, Statens Serum Institut, 5 Artillerivej, DK-2300 Copenhagen S, Denmark, or at hhj{at}ssi.dk.

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