Risk of Cancer among Offspring of Childhood-Cancer Survivors
Risto Sankila, M.D., Jørgen H. Olsen, M.D., Ph.D., Harald Anderson, Ph.D., Stanislaw Garwicz, M.D., Ph.D., Eystein Glattre, M.D., Ph.D., Henrik Hertz, M.D., Ph.D., Frøydis Langmark, M.D., Marjatta Lanning, M.D., Ph.D., Torgil Møller, M.D., Ph.D., Hrafn Tulinius, M.D., Ph.D., for The Association of the Nordic Cancer Registries and the Nordic Society of Paediatric Haematology and Oncology
Background Increasing numbers of children with cancer surviveand reach reproductive age. However, the risk of cancer (otherthan retinoblastoma) in the offspring of survivors of childhoodand adolescent cancer is uncertain.
Methods Using data from national cancer and birth registries,we assessed the risk of cancer among 5847 offspring of 14,652survivors of cancer in childhood or adolescence diagnosed sincethe 1940s and 1950s in Denmark, Finland, Iceland, Norway, andSweden. The offspring were followed up for a diagnosis of cancerfor 86,780 person-years, and standardized incidence ratios werecalculated.
Results Among the 5847 offspring, 44 malignant neoplasms werediagnosed (standardized incidence ratio, 2.6; 95 percent confidenceinterval, 1.9 to 3.5). There were 17 retinoblastomas, yieldinga standardized incidence ratio of 37. There were 27 neoplasmsother than retinoblastoma (standardized incidence ratio, 1.6;95 percent confidence interval, 1.1 to 2.4). The second mostcommon primary site of cancer among the offspring was the brainand nervous system, in which eight tumors were observed (standardizedincidence ratio, 2.0; 95 percent confidence interval, 0.9 to3.9). There were between zero and four apparently sporadic casesof cancer in other primary sites among the offspring. Excluding4 likely cases of hereditary cancer and 2 subsequent cancersamong the offspring with hereditary retinoblastoma, there were22 sporadic cancers, for a standardized incidence ratio of 1.3(95 percent confidence interval, 0.8 to 2.0).
Conclusions There is no evidence of a significantly increasedrisk of nonhereditary cancer among the offspring of survivorsof cancer in childhood.
Source Information
From the Finnish Cancer Registry, Helsinki (R.S.); the Institute of Cancer Epidemiology, Danish Cancer Society, Copenhagen (J.H.O.); the Southern Swedish Regional Cancer Registry (H.A., T.M.) and the Department of Pediatrics, University Hospital (S.G.), Lund, Sweden; the Cancer Registry of Norway, Oslo (E.G., F.L.); the Department of Pediatrics, University Hospital, Copenhagen (H.H.); the Department of Pediatrics, University Hospital of Oulu, Oulu, Finland (M.L.); and the Icelandic Cancer Registry, Reykjavik (H.T.).
Address reprint requests to Dr. Sankila at the Finnish Cancer Registry, Liisankatu 21 B, FIN-00170 Helsinki, Finland.
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