関連する実験動画
Updated: Jul 25, 2026

11:38
Voluntary Breath-hold Technique for Reducing Heart Dose in Left Breast Radiotherapy
Published on: July 3, 2014
まとめ
この研究では,甲状腺サプリメントの使用と乳がんリスクの増加との間に関連性がないことが判明しました. 研究者は,乳がんと乳がんのない女性を比較し,両グループで同様のサプリメント使用率を発見しました.
科学分野:
- 内分泌学 エンドックリノロジー
- 腫瘍学 腫瘍学
- エピデミオロジー エピデミオロジー
背景:
- 甲状腺ホルモンは,細胞代謝において重要な役割を果たします.
- 甲状腺ホルモン置換療法のがんリスクに対する潜在的な影響は,現在進行中の研究分野です.
- 乳がんのリスク要因を理解することは,公衆衛生にとって不可欠です.
研究 の 目的:
- 甲状腺サプリメントの使用と乳がん発生率の関連性を調査する.
- 長期にわたる甲状腺サプリメントの使用が乳がんリスクを高めるかどうかを判断する.
主な方法:
- ケース・コントロール・スタディ・デザインが採用されました.
- 乳がんと診断された659人の女性と,1719人の対照群と比較した.
- 甲状腺サプリメントの使用率を評価し,症例と対照群を比較した.
主要な成果:
- 甲状腺サプリメント使用の年齢標準化比率は1.0 (95%CI,0.7〜1.3) であり,有意な差異はありませんでした.
- 高リスクグループや長期使用 (>15年) でさえも,乳がんのリスクの増加は観察されなかった.
結論:
- 現在の証拠は,甲状腺サプリメントの使用と乳がんのリスクの増加との関連を裏付けていません.
- 長期にわたる甲状腺サプリメントの使用は,乳がんを発症するリスク要因ではないようです.
関連する概念動画
Synthesis and Regulation of Thyroid Hormones
Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
Functions of Thyroid Hormones
The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
Hyperthyroidism I: Introduction
Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
Hyperthyroidism II: Pathophysiology
Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
Graves' Disease I: Introduction
Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in...
Hypothyroidism II: Pathophysiology
Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...

