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Introduction: The purpose of this study was to determine the incidence of radiation induced hypothyroidism after treatment with radiotherapy alone or in combination with surgery/chemotherapy in head & neck cancer patients.
Methods: This study was a retrospective non-randomized trial performed on 100 patients of head & neck cancer in whom definitive radiotherapy, postoperative radiotherapy or radiotherapy in combination with chemotherapy was given. Values of TSH, T3 & T4 were analyzed at baseline and at 6 monthly follow-up. Subclinical hypothyroidism was defined as TSH value of > 4 mU/L and Clinical hypothyroidism was taken as TSH > 10 mU/L with decreased T3 & T4.
Results: Out of 100 patients, 73 individuals were euthyroid at the end of 2-year follow-up, 21% had subclinical hypothyroidism and 6% had clinical hypothyroidism. The incidence of subclinical hypothyroidism in the surgery plus radiotherapy group and the radiotherapy group was 22.3% & 50%, respectively. The incidence of clinical hypothyroidism in the surgery plus radio therapy group and the radiotherapy group was 6.5% & nil, respectively.
Conclusion: The incidence of hypothyroidism is high in head & neck cancer patients receiving radiotherapy. The risk is higher in patients who undergo surgery in combination with radiotherapy. Regular thyroid function test is, therefore, recommended.
Methods: This study was a retrospective non-randomized trial performed on 100 patients of head & neck cancer in whom definitive radiotherapy, postoperative radiotherapy or radiotherapy in combination with chemotherapy was given. Values of TSH, T3 & T4 were analyzed at baseline and at 6 monthly follow-up. Subclinical hypothyroidism was defined as TSH value of > 4 mU/L and Clinical hypothyroidism was taken as TSH > 10 mU/L with decreased T3 & T4.
Results: Out of 100 patients, 73 individuals were euthyroid at the end of 2-year follow-up, 21% had subclinical hypothyroidism and 6% had clinical hypothyroidism. The incidence of subclinical hypothyroidism in the surgery plus radiotherapy group and the radiotherapy group was 22.3% & 50%, respectively. The incidence of clinical hypothyroidism in the surgery plus radio therapy group and the radiotherapy group was 6.5% & nil, respectively.
Conclusion: The incidence of hypothyroidism is high in head & neck cancer patients receiving radiotherapy. The risk is higher in patients who undergo surgery in combination with radiotherapy. Regular thyroid function test is, therefore, recommended.
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17-22
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2020-09-09
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bwmeta1.element.ceon.element-17f91b69-6c8c-3aae-b78d-b25769be168d
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