© 1991 by Oxford University Press
Journal of the National Cancer Institute, Vol. 83, No. 15, 1072-1077,
August 7, 1991
© 1991 Oxford University Press
Cancer Risk After Iodine-131 Therapy for Hyperthyroidism
Department of Cancer Prevention, Rediumhemmet, Karolinska Hospital Stockholm, Sweden
Department of General Oncology, Rediumhemmet, Karolinska Hospital Stockholm, Sweden
Department of Cancer Epidemiology, Rediumhemmet, Karolinska Hospital Stockholm, Sweden
Department of General Oncology, Sahlgren's Hospital Gothenburg, Sweden
Nuclear Medicine Division, Sahlgren's Hospital Gothenburg, Sweden
Department of General Oncology, Malmö General Hospital Malmö, Sweden
Department of Internal Medicine, Malmö General Hospital Malmö, Sweden
Department of General Oncology, University Hospital Lund, Sweden
Department of General Oncology, University Hospital Ume{acute}, Sweden
Department of Hospital Physics, South Hospital Stockholm, Sweden
Department of General Oncology, University Hospital Uppsala, Sweden
Epidemiology and Biostatistics Program, Division of Cancer Etiology, National Cancer Institute Bethesda, Md
*Correspondence to: Lars-Erk Holm, M.D., Department of Cancer Prevention, Radiumhemmet, Karolinska Hospital, S-10401 Stockholm, Sweden
Cancer incidence was studied in 10 552 patients (mean age, 57 years) who received 131I therapy (mean dose, 506 MBq) for hyperthyroidism between 1950 and 1975. Follow-up on these patients was continued for an average of 15 years. Record linkage with the Swedish Cancer Register for the period 19581985 identified 1543 cancers occurring 1 year or more after 131I treatment, and the standardized incidence ratio (SIR) was 1.06 (95% confidence interval = 1.011.11). Significantly increased SIRs were observed for cancers of the lung (SIR = 1.32; n = 105) and kidney (SIR = 1.39; n = 66). Among 10-year survivors, significantly elevated risks were seen for cancers of the stomach (SIR = 1.33; n = 58), kidney (SIR = 1.51; n = 37), and brain (SIR = 1.63; n = 30). Only the risk for stomach cancer, however, increased over time (P<.05) and with increasing activity administered (P = not significant). The risk for malignant lymphoma was significantly below expectation (SIR = 0.53; n = 11). Overall cancer risk did not increase with administered 131I dose or with time since exposure. The absence of any increase in leukemia adds further support to the view that a radiation dose delivered gradually over time is less carcinogenic than the same total dose received over a short time. Only for stomach cancer was a possible radiogenic excess suggested. [J Natl Cancer Inst 83: 10721077, 1991]
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