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Abnormalities of the Thyroid in Survivors of Hodgkin’s Disease: Data from the Childhood Cancer Survivor Study¹

Departments of Pediatrics (C.S.) and Radiation Oncology (S.W.), Memorial Sloan-Kettering Cancer Center, New York, New York 10021; Department of Biostatistics, Fred Hutchinson Cancer Research Center (J.W.), Seattle, Washington 98104; Department of Pediatrics, University of Minnesota (A.M., L.R.), Minneapolis, Minnesota 55455; Department of Radiation Physics, University of Texas, M. D. Anderson Cancer Center (M.S.), Houston, Texas 77030; Department of Pediatrics, Roswell Park Cancer Institute (D.G.), Buffalo, New York 14263; Department of Pediatrics, Stanford University Medical Center (N.M.), Stanford, California 94304; and Department of Pediatrics, Children’s Hospital, University of Colorado Health Sciences Center (B.G.), Denver, Colorado 80218

Address all correspondence and requests for reprints to: Charles Sklar, M.D., Department of Pediatrics, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10021. E-mail: sklarc{at}mskcc.org

Treatment for Hodgkin’s disease (HD) is associated with a variety of thyroid abnormalities, including hypothyroidism, hyperthyroidism, and thyroid neoplasms. Due to the small sample size and short follow-up time of most published studies, it has been difficult to appreciate the full extent of the problem and to characterize the interaction between various patient and treatment variables. To overcome these limitations we have assessed thyroid status in 1,791 (959 males) HD survivors from among 13,674 participants in the Childhood Cancer Survivor Study, a cohort of 5-yr survivors of childhood and adolescent cancer diagnosed between 1970 and 1986. Thyroid abnormalities were ascertained as part of a 22-page questionnaire sent to participants. Survivors were a median of 14 yr (range, 2–20 yr) at diagnosis of HD and a median of 30 yr (range, 12–47 yr) at follow-up. Seventy-nine percent of subjects were treated with radiation (median dose of radiation to the thyroid, 3500 cGy; range, 0.37–5500 cGy). Control data were available from 2,808 (1,346 males) sibling controls. Thirty-four percent of the entire cohort has been diagnosed with at least one thyroid abnormality. Hypothyroidism was the most common disturbance, with a relative risk of 17.1 (P < 0.0001) compared to sibling controls. Increasing dose of radiation, older age at diagnosis of HD, and female sex were all independently associated with an increased risk of hypothyroidism. Actuarial risk of hypothyroidism for subjects treated with 4500 cGy or more is 50% at 20 yr from diagnosis. Hyperthyroidism was reported by 5% of survivors, which was 8-fold greater (P < 0.0001) than the incidence reported by the controls. Thyroid dose of 3500 cGy or more was the only risk factor identified for hyperthyroidism. The risk of thyroid nodules was 27 times (P < 0.0001) that in sibling controls. Female sex and radiation dose to the thyroid of 2500 cGy or more were independent risk factors for thyroid nodules. The actuarial risk of a female survivor developing a thyroid nodule is 20% at 20 yr from diagnosis. Thyroid cancer was diagnosed in 20 survivors, which is 18 times the expected rate for the general population. After taking into account the possibility that some of the relative risk estimates may be exaggerated due to ascertainment bias, abnormalities of the thyroid are still extremely common in young adult survivors of childhood HD, particularly among females treated with high doses of radiation to the neck.

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