Thyroid dysfunction following combined therapy for laryngeal carcinoma

Area of Science:

• Endocrinology
• Oncology
• Head and Neck Surgery

Background:

• Laryngeal cancer treatment often involves total laryngectomy and thyroid lobectomy.
• External beam radiotherapy is frequently used as an adjuvant therapy.
• The impact of combined therapy on thyroid function requires investigation.

Purpose of the Study:

• To assess thyroid function in patients treated for laryngeal carcinoma.
• To determine the incidence of hypothyroidism after combined laryngectomy and radiotherapy.
• To identify risk factors and recommend management strategies for thyroid dysfunction.

Main Methods:

• Thyroid function was evaluated by measuring thyroxine (T4) and thyroid stimulating hormone (TSH) levels.
• A cohort of 27 patients with prior laryngeal cancer was studied.
• Patients were stratified based on treatment: surgery only versus combined surgery and radiotherapy.

Main Results:

• Combined therapy (surgery + radiotherapy) led to abnormal thyroid function in 45% of patients.
• Clinical hypothyroidism occurred in 9% and subclinical hypothyroidism in 36% of patients receiving combined therapy.
• Surgery alone did not result in thyroid dysfunction; all patients in this group had normal thyroid function.

Conclusions:

• Combined laryngeal cancer treatment significantly increases the risk of hypothyroidism.
• Routine post-operative thyroid function testing is crucial for patients receiving combined therapy.
• Prophylactic thyroxine treatment is recommended for patients with subclinical hypothyroidism to prevent complications.