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Thyroid Dysfunction: Relation to Radiation Dose

Thyroid Dysfunction: Relation to Radiation Dose

Radiation therapy for cancer and development of hypothyroidism: what are the predictive risks?

A study in the journal Head and Neck reviewed the records of 102 patients who received radiation therapy for head and neck cancer.

Permanent dysfunction was seen in 24.5%, with a significantly higher incidence in women. Concurrent chemotherapy increased the risk of permanent dysfunction.

There was a significant correlation between the volume of thyroid receiving greater than 50 Gy and subsequent thyroid dysfunction.

The author’s conclusions: radiotherapy-induced thyroid dysfunction is clearly dose related; the authors recommended a mean dose of less than 54.58 Gy, noting female sex and concurrent chemotherapy add to the predictive risk.

 
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