関連する実験動画
Updated: Aug 11, 2026

11:38
Voluntary Breath-hold Technique for Reducing Heart Dose in Left Breast Radiotherapy
Published on: July 3, 2014
まとめ
甲状腺機能低下症に対する甲状腺補給は,乳がんのリスクを増やさない. この研究では,予想される比率と比較して,甲状腺サプリメントで治療を受けた女性の乳がん症例が過剰に増加していないことが判明しました.
科学分野:
- エンドクリノロジー エンドクリノロジー
- 腫瘍学 腫瘍学
- エピデミオロジー エピデミオロジー
背景:
- イアトロゲン性甲状腺機能低下症は,しばしば甲状腺補給で治療されます.
- 甲状腺ホルモン置換療法と乳がんのリスクとの潜在的な関連は,調査が必要です.
研究 の 目的:
- イアトロゲン性甲状腺機能低下症のために甲状腺補給を受けている女性における乳癌のリスクを調査する.
主な方法:
- ミネソタ州ロチェスターにあるメイオ・クリニックでコホート研究が行われました.
- 1665人の甲状腺機能低下女性の乳がん症例を標準化発生率比 (SIR) を用いて予想される症例と比較した.
- 甲状腺機能過剰症/甲状腺機能低下症の危険因子と管理を分析した.
主要な成果:
- 甲状腺機能低下症の女性における乳がんの標準化発生率 (SIR) は0.9であった (47例が観察され,52.9例が予想された).
- 乳腺がんのリスクの増加は,甲状腺機能のない女性では観察されなかった (SIR = 1.0).
- 乳がんのリスクは,甲状腺機能過剰症の管理や甲状腺機能低下の要因によって,乳房生検の anamnesis を除いて,有意に影響されなかった.
結論:
- イアトロゲン性甲状腺機能低下症に対する甲状腺補給は,乳がんのリスクを増加させるようには見えません.
- この発見は,甲状腺ホルモンの置換療法が乳がんの発症に関して安全であることを示唆しています.
関連する概念動画
The Thyroid Gland
The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
The follicles have a central cavity lined by simple cuboidal to squamous epithelial cells called follicular cells. These cells produce the glycoprotein...
The follicles have a central cavity lined by simple cuboidal to squamous epithelial cells called follicular cells. These cells produce the glycoprotein...
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...
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...

