13.07.2015 Views

Guidelines for Complications of Cancer Treatment Vol VIII Part B

Guidelines for Complications of Cancer Treatment Vol VIII Part B

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Hypothyroidism After <strong>Treatment</strong> <strong>for</strong>Head Neck <strong>Cancer</strong>sIncidence Pretreatment- 5% Overall 10-70%Non laryngeal resections with RT-12% (LOE-3)Highest incidence in patients undergoing totallaryngectomy with thyroid lobectomy with RT-48-70%(LOE-3)Post RT alone-5 and 10yr rates <strong>of</strong> hypothyroidism are-20&27% repectively (LOE-3)Risk Factors Thyroid lobectomy (with laryngectomy) followed by RT Higher doses <strong>of</strong> radiotherapy Unilateral versus bilateral RT to neck Pre-existing thyroiditis Presence <strong>of</strong> antimicrosomal thyroid antibodies inpatient’s pretreatment samples (LOE 3)224

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