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Perspective: National Cancer Institute summary report about estimated exposures and thyroid doses received from iodine 131 in fallout after Nevada atmospheric nuclear bomb tests Hundahl SACA Cancer J Clin 1998[Sep]; 48 (5): 285-98Environmental 131I contamination from atmospheric nuclear bomb tests conducted at the NTS from 1951 to 1958 exposed Americans nationwide to a cumulative average dose of 1 to 4 rad to the thyroid gland. By comparison, 10 years of exposure to natural background sources of thyroid radiation results in a cumulative dose of 1 rad. Americans living in certain high-deposition areas received an average cumulative thyroid dose of as much as 16 rad. Individual dose rates vary considerably as a function of age at the time of exposure, site of residence, and dietary habits with respect to milk consumption. The individual cumulative thyroid dose for persons born between 1945 and 1958 may be significantly higher than the reported averages for their locale. The NCI report contains voluminous data tables permitting detailed calculations of individual dose. Additionally, color-coded dose maps allow one to approximate individual dose conveniently. Translation of cumulative thyroid dose attributable to 131I to predictions of increased rates of thyroid cancer appears problematic and is the subject of further study. In contrast to studies of patients receiving external thyroid irradiation, existing studies of patients treated with 131I for diagnostic and therapeutic medical purposes do not document increased rates of thyroid cancer. An Institute of Medicine task force is expected to issue a report on this subject in September 1998. This review also briefly summarizes the evaluation, diagnosis, and treatment of patients with papillary and follicular thyroid cancers. Data from 53,856 patients with thyroid cancer accessioned to the NCDB from 1985 to 1995 document extremely high survival rates for patients in the United States with papillary and follicular thyroid cancer.|*Nuclear Warfare[MESH]|Adult[MESH]|Body Burden[MESH]|Female[MESH]|Humans[MESH]|Iodine Radioisotopes/*adverse effects/analysis[MESH]|Male[MESH]|Middle Aged[MESH]|National Institutes of Health (U.S.)[MESH]|Neoplasms, Radiation-Induced/etiology/*mortality[MESH]|Nevada[MESH]|Radiation Monitoring[MESH]|Radioactive Fallout/*adverse effects/analysis[MESH]|Risk[MESH]|Survival Rate[MESH]|Thyroid Gland/*radiation effects[MESH]|Thyroid Neoplasms/etiology/*mortality[MESH]|United States[MESH] |