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Importance of Thyroid Hormone Replacement Therapy in Patients with Medullary Thyroid Cancer

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Medullary Thyroid Cancer
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Abstract

Levothyroxine (LT4) replacement should be promptly initiated in patients who have undergone thyroidectomy for a diagnosis of medullary thyroid cancer in order to avoid any period of hypothyroidism . LT4 requirement is generally higher than that in patients with autoimmune hypothyroidism and decreases as a patient progresses from childhood to adulthood. The goal of therapy is a normal serum TSH, prevention of any symptoms of hypothyroidism , and ideally patient well-being and satisfaction. Levothyroxine should be administered in a schedule that the patient is able to adhere to, with awareness of medications such as calcium supplements, proton pump inhibitors, and tyrosine kinase inhibitors that may increase a patient’s requirement for LT4. Patient education about lifelong dependence on exogenous LT4 is essential. There are multiple issues with being dependent on LT4 administration that may affect patients across their life span. These include remembering to take LT4 during childhood and adolescence, increased LT4 requirement during pregnancy in young adulthood, and avoidance of iatrogenic thyroid disease in all treated patients, but particularly avoidance of iatrogenic hyperthyroidism in older individuals. Quality of life may not be optimized in all patients taking LT4. Whether this may be addressed by providing a sustained release liothyronine preparation in combination with LT4 remains an area of future research.

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Jonklaas, J. (2016). Importance of Thyroid Hormone Replacement Therapy in Patients with Medullary Thyroid Cancer. In: Wang, T., Evans, D. (eds) Medullary Thyroid Cancer. Springer, Cham. https://doi.org/10.1007/978-3-319-39412-1_13

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