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    Title: Risk of osteoporosis in thyroid cancer patients using levothyroxine: a population-based study.
    Authors: Lin, Shih-Yi;Lin, Shih-Yi;Lin, Cheng-Li;Lin, Cheng-Li;Che, Hsien-Te;Chen, Hsien-Te;高嘉鴻;Kao, Chia-Hung;*
    Contributors: 生物資訊與醫學工程學系
    Keywords: Thyroid cancer, levothyroxine, osteoporosis, cohort study
    Date: 2018-05
    Issue Date: 2018-10-22 11:28:09 (UTC+8)
    Abstract: Background: The outcomes of thyroid cancer patients using levothyroxine are largely undetermined.

    Methods: The study population consisted of 9398 patients newly diagnosed with thyroid cancer; their data was retrieved from a subset of the National Health Insurance Research Database of Taiwan during the period of 1999–2011. In this nationwide retrospective cohort study, we compared the risk of osteoporosis among thyroid cancer patients with levothyroxine use, those without levothyroxine use, and propensity-score-matched non-thyroid controls. We also investigated the duration–response and dose–response relationships between levothyroxine use and the risk of osteoporosis. The competing risk was also analyzed.

    Results: The mean duration of follow-up was 6.63 years for patients without thyroid cancer, 5.45 years for thyroid cancer patients without levothyroxine use, and 6.46 years for thyroid cancer patients with levothyroxine use. The incidence of osteoporosis was higher in the thyroid cancer cohort than in the non-thyroid-cancer cohort (8.69 vs. 6.60 per 1000 person-years, respectively), with an adjusted hazard ratio of 1.39 (95% confidence interval [CI] = 1.22–1.58). Thyroid cancer patients with levothyroxine use exhibited a significantly higher risk of osteoporosis than non-thyroid-cancer patients, while thyroid cancer patients not using levothyroxine did not have significant higher risks than non-thyroid-cancer patients. Compared with patients without thyroid cancer, the risk of osteoporosis increased from 1.53 (95% CI = 0.91–2.57) in patients receiving a cumulative dose of ≤265 mg levothyroxine, to 3.62 in those receiving a cumulative dose of >395 mg levothyroxine (95% CI = 2.16–6.06).

    Conclusion: Our population-based cohort study showed that thyroid cancer patients receiving levothyroxine have a higher risk of osteoporosis.
    Appears in Collections:[Department of Biomedical informatics  ] Journal Article

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