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Hyperthyroidism II: Pathophysiology

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 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...

Graves Disease II: Pathophysiology

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...

Hyperthyroidism I: Introduction

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...

Goiter

Goiter

Goiter refers to an abnormal enlargement of the thyroid gland that may appear as a diffuse goiter (uniform enlargement) or nodular (single or multiple nodules). Functionally, it is classified as nontoxic (normal/low hormone levels) or toxic (excess hormone production).PathophysiologyDiffuse thyroid enlargement typically results from prolonged stimulation by thyroid-stimulating hormone (TSH) or TSH-like agents, commonly seen in hypothyroidism or iodine deficiency. In contrast, in hyperthyroid...

Hypothyroidism II: Pathophysiology

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...

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Spontaneous Murine Model of Anaplastic Thyroid Cancer

Spontaneous Murine Model of Anaplastic Thyroid Cancer

Published on: February 3, 2023

Iodine-refractory thyroid carcinoma.

Apar Kishor Ganti¹, Ezra E W Cohen

¹Division of Oncology-Hematology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198-7680, USA.

Reviews on Recent Clinical Trials

|May 14, 2008

Summary

This summary is machine-generated.

This review covers thyroid cancer biology and treatment, focusing on iodine-refractory tumors. It highlights new therapies for advanced thyroid carcinoma unresponsive to radioactive iodine therapy.

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Establishment and Characterization of Patient-Derived Xenograft Models of Anaplastic Thyroid Carcinoma and Head and Neck Squamous Cell Carcinoma

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Area of Science:

Oncology
Endocrinology
Molecular Biology

Background:

Thyroid cancer management often includes thyroidectomy, radioactive iodine, and hormone replacement.
Tumor dedifferentiation can lead to radioactive iodine refractoriness.
Advanced, dedifferentiated thyroid cancers have a poor prognosis with limited treatment options.

Purpose of the Study:

To review the unique biology of thyroid cancer.
To examine intracellular pathways targeted in thyroid cancer research.
To emphasize trials on chemotherapy and novel therapies for iodine-refractory thyroid carcinoma.

Main Methods:

Literature review of thyroid cancer biology.
Analysis of intracellular signaling pathways in thyroid tumors.
Evaluation of clinical trials for iodine-refractory thyroid cancer.

Main Results:

Thyroid cancer biology presents unique challenges, particularly dedifferentiation.
Specific intracellular pathways are key targets for novel therapies.
Cytotoxic chemotherapy shows variable efficacy in iodine-refractory cases.

Conclusions:

Understanding thyroid cancer biology is crucial for developing new treatments.
Targeting specific pathways offers promise for iodine-refractory disease.
Novel therapeutic approaches are essential for improving outcomes in advanced thyroid carcinoma.