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Related Experiment Video

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"Sun's Seven-Step Technique" for Endoscopic En-Bloc Resection of Thyroid Cancer via the Chest-Breast Approach

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Thyroid dysfunction in laryngectomees-10 years after treatment.

Ambrose Chung-Wai Ho¹, Wai-Kuen Ho, Paul Kin-Yip Lam

¹Division of Otorhinolaryngology Head and Neck Surgery, Department of Surgery, University of Hong Kong Medical Centre, Queen Mary Hospital, Hong Kong.

|July 20, 2007

Summary

Hypothyroidism frequently occurs after laryngeal cancer treatment, affecting nearly half of patients. Hemithyroidectomy and advanced staging increase risks, necessitating long-term thyroid function monitoring.

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Area of Science:

Otorhinolaryngology
Endocrinology
Oncology

Background:

Hypothyroidism is a known complication following head and neck cancer treatment.
Previous studies lack comparability due to varied patient groups and treatment modalities.
This study focuses on a homogenous group of laryngeal cancer patients.

Purpose of the Study:

To determine the incidence of hypothyroidism in patients treated with total laryngectomy and irradiation for laryngeal cancer.
To identify risk factors associated with post-treatment hypothyroidism.
To assess the long-term development of hypothyroidism.

Main Methods:

Retrospective review of 147 total laryngectomy patients (1993-2003).
Assessment of serum thyroxine and free T4 levels.
Classification of hypothyroidism into subclinical and clinical categories.

Main Results:

Overall hypothyroidism incidence was 49% (44% subclinical, 5% clinical).
Hemithyroidectomy (RR 2.1) and advanced tumor stage (RR 1.3) were significant risk factors.
Hypothyroidism developed in 19.9% at 3 years, 38.6% at 6 years, and 93.3% by 10 years.

Conclusions:

Hypothyroidism is a common complication after laryngeal cancer treatment with total laryngectomy and irradiation.
Hemithyroidectomy is a key risk factor for developing hypothyroidism.
Long-term, periodic thyroid function evaluation is crucial for these patients, extending up to 10 years post-treatment.