Thyroid Cancer after Childhood Exposure to External Radiation: An Updated Pooled Analysis of 12 Studies.

Abstract:

:Studies have causally linked external thyroid radiation exposure in childhood with thyroid cancer. In 1995, investigators conducted relative risk analyses of pooled data from seven epidemiologic studies. Doses were mostly <10 Gy, although childhood cancer therapies can result in thyroid doses >50 Gy. We pooled data from 12 studies of thyroid cancer patients who were exposed to radiation in childhood (ages <20 years), more than doubling the data, including 1,070 (927 exposed) thyroid cancers and 5.3 million (3.4 million exposed) person-years. Relative risks increased supralinearly through 2-4 Gy, leveled off between 10-30 Gy and declined thereafter, remaining significantly elevated above 50 Gy. There was a significant relative risk trend for doses <0.10 Gy (P < 0.01), with no departure from linearity (P = 0.36). We observed radiogenic effects for both papillary and nonpapillary tumors. Estimates of excess relative risk per Gy (ERR/Gy) were homogeneous by sex (P = 0.35) and number of radiation treatments (P = 0.84) and increased with decreasing age at the time of exposure. The ERR/Gy estimate was significant within ten years of radiation exposure, 2.76 (95% CI, 0.94-4.98), based on 42 exposed cases, and remained elevated 50 years and more after exposure. Finally, exposure to chemotherapy was significantly associated with thyroid cancer, with results supporting a nonsynergistic (additive) association with radiation.

journal_name

Radiat Res

journal_title

Radiation research

authors

Veiga LH,Holmberg E,Anderson H,Pottern L,Sadetzki S,Adams MJ,Sakata R,Schneider AB,Inskip P,Bhatti P,Johansson R,Neta G,Shore R,de Vathaire F,Damber L,Kleinerman R,Hawkins MM,Tucker M,Lundell M,Lubin JH

doi

10.1667/RR14213.1

subject

Has Abstract

pub_date

2016-05-01 00:00:00

pages

473-84

issue

5

eissn

0033-7587

issn

1938-5404

journal_volume

185

pub_type

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