Among Individuals Irradiated for Benign Conditions in Childhood, Developing Thyroid Cancer Does Not Affect All-Cause Survival
| Autor: | Cari M. Kitahara, Jay H. Lubin, Dan V. Mihailescu, Leonid Vydro, Arthur B. Schneider |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Oncology
Adult Male endocrine system medicine.medical_specialty Neoplasms Radiation-Induced endocrine system diseases Adolescent Endocrinology Diabetes and Metabolism 030209 endocrinology & metabolism Affect (psychology) 03 medical and health sciences 0302 clinical medicine Endocrinology Risk Factors Internal medicine Medicine Humans Registries Thyroid Neoplasms Child Thyroid cancer Aged Aged 80 and over business.industry Thyroid Cancer and Nodules Middle Aged medicine.disease Survival Rate 030220 oncology & carcinogenesis Female Cranial Irradiation business All cause mortality |
| Zdroj: | Thyroid |
| Popis: | Background: Whether radiation-induced thyroid cancer affects survival rates has not been clearly elucidated. Survival could be affected by the thyroid cancer itself, its treatment, or by being a sign of susceptibility to other cancers. The objective of the current study was to determine if the development of thyroid cancer is associated with a differential survival in radiation-exposed individuals. Methods: We conducted a matched prospective cohort mortality follow-up study based on data from a cohort of 4296 individuals who were irradiated predominantly for enlarged tonsils during their childhood (between 1939 and 1962) and were prospectively followed since 1974. The study matched an irradiated subject who developed (was exposed to) thyroid cancer (a “case”) and two irradiated subjects, who had not developed (were not exposed to) thyroid cancer (“controls”) by the time of case incidence. The two controls were randomly matched to cases by sex, year of birth, age at radiation treatment, and radiation dose. Then, using a stratified Cox analysis, we compared survival time from the date of thyroid cancer diagnosis or time of selection to either date of death or the end of the observation period (December 31, 2016). Vital status and causes of death were determined using the National Death Index (1979–2016), the Social Security Death Index (1974–1979), and study files. Cause of death was categorized as cardiovascular, malignancy, or other. Results: A total of 1008 subjects were included in the analysis, including 353 thyroid cancer cases. At the end of the study period, 162 of 655 (24.7%) of individuals without thyroid cancer had died compared with 100 of 353 (28.3%) of the subjects with thyroid cancer. The hazard ratio (HR) for all-cause mortality, comparing the thyroid cancer cases to controls, was close to unity (HR = 1.01 [0.77–1.33]). HRs remained insignificant after eliminating matched sets with microcarcinomas, defined as tumor size |
| Databáze: | OpenAIRE |
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