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Outcome of radioiodine-131 therapy in hyperfunctioning thyroid nodules: a 20 years' retrospective study

Summary Objective  To investigate the risk of hypothyroidism after radioiodine (131I) treatment for hyperfunctioning thyroid nodules. Design  Retrospective analysis of patients treated with 131I for hyperfunctioning thyroid nodules and followed up for a maximum of 20 years. Patients  A total of 346...

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Published in:Clinical endocrinology (Oxford) 2005-03, Vol.62 (3), p.331-335
Main Authors: Ceccarelli, Claudia, Bencivelli, Walter, Vitti, Paolo, Grasso, Lucia, Pinchera, Aldo
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description Summary Objective  To investigate the risk of hypothyroidism after radioiodine (131I) treatment for hyperfunctioning thyroid nodules. Design  Retrospective analysis of patients treated with 131I for hyperfunctioning thyroid nodules and followed up for a maximum of 20 years. Patients  A total of 346 patients treated with 131I in the years 1975–95, for a single hyperfunctioning nodule. Measurements  Hypothyroidism was defined as TSH levels > 3·7 mU/l. Kaplan–Meier survival analysis was used to analyse permanence of euthyroidism after 131I. A stepwise Cox proportional hazard model was used to identify factors influencing the progression to hypothyroidism. Results  The cumulative incidence of hypothyroidism was 7·6% at 1 year, 28% at 5 years, 46% at 10 years and 60% at 20 years. Age (P 
doi_str_mv 10.1111/j.1365-2265.2005.02218.x
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Design  Retrospective analysis of patients treated with 131I for hyperfunctioning thyroid nodules and followed up for a maximum of 20 years. Patients  A total of 346 patients treated with 131I in the years 1975–95, for a single hyperfunctioning nodule. Measurements  Hypothyroidism was defined as TSH levels &gt; 3·7 mU/l. Kaplan–Meier survival analysis was used to analyse permanence of euthyroidism after 131I. A stepwise Cox proportional hazard model was used to identify factors influencing the progression to hypothyroidism. Results  The cumulative incidence of hypothyroidism was 7·6% at 1 year, 28% at 5 years, 46% at 10 years and 60% at 20 years. Age (P &lt; 0·01), 24‐th 131I uptake (P &lt; 0·05) and previous treatment with methimazole (MMI, P &lt; 0·1) were associated with a faster progression towards hypothyroidism, while thyroid and nodule size, thyroid status at diagnosis and degree of extranodular thyroid parenchymal suppression had no influence. In hyperthyroid patients with partial parenchymal suppression, however, previous MMI treatment was the most important prognostic factor (P &lt; 0·01). Conclusions  After 20 years of follow‐up, 60% of patients treated with 131I for a single hyperfunctioning nodule are hypothyroid. Factors increasing the risk of hypothyroidism are age, 131I uptake and MMI pretreatment. The prognostic value of this last factor, however, depends on the degree of suppression of the extranodular thyroid parenchyma at the scan.</description><identifier>ISSN: 0300-0664</identifier><identifier>EISSN: 1365-2265</identifier><identifier>DOI: 10.1111/j.1365-2265.2005.02218.x</identifier><identifier>PMID: 15730415</identifier><identifier>CODEN: CLECAP</identifier><language>eng</language><publisher>Oxford, UK: Blackwell Science Ltd</publisher><subject>Adult ; Age Factors ; Aged ; Antithyroid Agents - adverse effects ; Biological and medical sciences ; Disease Progression ; Endocrinopathies ; Epidemiologic Methods ; Female ; Fundamental and applied biological sciences. Psychology ; Humans ; Hyperthyroidism - radiotherapy ; Hypothyroidism - etiology ; Iodine Radioisotopes - adverse effects ; Iodine Radioisotopes - therapeutic use ; Male ; Medical sciences ; Methimazole - adverse effects ; Middle Aged ; Non tumoral diseases. Target tissue resistance. 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Design  Retrospective analysis of patients treated with 131I for hyperfunctioning thyroid nodules and followed up for a maximum of 20 years. Patients  A total of 346 patients treated with 131I in the years 1975–95, for a single hyperfunctioning nodule. Measurements  Hypothyroidism was defined as TSH levels &gt; 3·7 mU/l. Kaplan–Meier survival analysis was used to analyse permanence of euthyroidism after 131I. A stepwise Cox proportional hazard model was used to identify factors influencing the progression to hypothyroidism. Results  The cumulative incidence of hypothyroidism was 7·6% at 1 year, 28% at 5 years, 46% at 10 years and 60% at 20 years. Age (P &lt; 0·01), 24‐th 131I uptake (P &lt; 0·05) and previous treatment with methimazole (MMI, P &lt; 0·1) were associated with a faster progression towards hypothyroidism, while thyroid and nodule size, thyroid status at diagnosis and degree of extranodular thyroid parenchymal suppression had no influence. In hyperthyroid patients with partial parenchymal suppression, however, previous MMI treatment was the most important prognostic factor (P &lt; 0·01). Conclusions  After 20 years of follow‐up, 60% of patients treated with 131I for a single hyperfunctioning nodule are hypothyroid. Factors increasing the risk of hypothyroidism are age, 131I uptake and MMI pretreatment. The prognostic value of this last factor, however, depends on the degree of suppression of the extranodular thyroid parenchyma at the scan.</description><subject>Adult</subject><subject>Age Factors</subject><subject>Aged</subject><subject>Antithyroid Agents - adverse effects</subject><subject>Biological and medical sciences</subject><subject>Disease Progression</subject><subject>Endocrinopathies</subject><subject>Epidemiologic Methods</subject><subject>Female</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Humans</subject><subject>Hyperthyroidism - radiotherapy</subject><subject>Hypothyroidism - etiology</subject><subject>Iodine Radioisotopes - adverse effects</subject><subject>Iodine Radioisotopes - therapeutic use</subject><subject>Male</subject><subject>Medical sciences</subject><subject>Methimazole - adverse effects</subject><subject>Middle Aged</subject><subject>Non tumoral diseases. Target tissue resistance. Benign neoplasms</subject><subject>Radiation Injuries - etiology</subject><subject>Thyroid Gland - physiology</subject><subject>Thyroid Nodule - radiotherapy</subject><subject>Thyroid. 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Psychology</topic><topic>Humans</topic><topic>Hyperthyroidism - radiotherapy</topic><topic>Hypothyroidism - etiology</topic><topic>Iodine Radioisotopes - adverse effects</topic><topic>Iodine Radioisotopes - therapeutic use</topic><topic>Male</topic><topic>Medical sciences</topic><topic>Methimazole - adverse effects</topic><topic>Middle Aged</topic><topic>Non tumoral diseases. Target tissue resistance. Benign neoplasms</topic><topic>Radiation Injuries - etiology</topic><topic>Thyroid Gland - physiology</topic><topic>Thyroid Nodule - radiotherapy</topic><topic>Thyroid. Thyroid axis (diseases)</topic><topic>Thyrotropin - blood</topic><topic>Treatment Outcome</topic><topic>Vertebrates: endocrinology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ceccarelli, Claudia</creatorcontrib><creatorcontrib>Bencivelli, Walter</creatorcontrib><creatorcontrib>Vitti, Paolo</creatorcontrib><creatorcontrib>Grasso, Lucia</creatorcontrib><creatorcontrib>Pinchera, Aldo</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Calcium &amp; Calcified Tissue Abstracts</collection><collection>ProQuest Health &amp; Medical Complete (Alumni)</collection><collection>Nursing &amp; Allied Health Premium</collection><jtitle>Clinical endocrinology (Oxford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ceccarelli, Claudia</au><au>Bencivelli, Walter</au><au>Vitti, Paolo</au><au>Grasso, Lucia</au><au>Pinchera, Aldo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Outcome of radioiodine-131 therapy in hyperfunctioning thyroid nodules: a 20 years' retrospective study</atitle><jtitle>Clinical endocrinology (Oxford)</jtitle><addtitle>Clin Endocrinol (Oxf)</addtitle><date>2005-03</date><risdate>2005</risdate><volume>62</volume><issue>3</issue><spage>331</spage><epage>335</epage><pages>331-335</pages><issn>0300-0664</issn><eissn>1365-2265</eissn><coden>CLECAP</coden><abstract>Summary Objective  To investigate the risk of hypothyroidism after radioiodine (131I) treatment for hyperfunctioning thyroid nodules. Design  Retrospective analysis of patients treated with 131I for hyperfunctioning thyroid nodules and followed up for a maximum of 20 years. Patients  A total of 346 patients treated with 131I in the years 1975–95, for a single hyperfunctioning nodule. Measurements  Hypothyroidism was defined as TSH levels &gt; 3·7 mU/l. Kaplan–Meier survival analysis was used to analyse permanence of euthyroidism after 131I. A stepwise Cox proportional hazard model was used to identify factors influencing the progression to hypothyroidism. Results  The cumulative incidence of hypothyroidism was 7·6% at 1 year, 28% at 5 years, 46% at 10 years and 60% at 20 years. Age (P &lt; 0·01), 24‐th 131I uptake (P &lt; 0·05) and previous treatment with methimazole (MMI, P &lt; 0·1) were associated with a faster progression towards hypothyroidism, while thyroid and nodule size, thyroid status at diagnosis and degree of extranodular thyroid parenchymal suppression had no influence. In hyperthyroid patients with partial parenchymal suppression, however, previous MMI treatment was the most important prognostic factor (P &lt; 0·01). Conclusions  After 20 years of follow‐up, 60% of patients treated with 131I for a single hyperfunctioning nodule are hypothyroid. Factors increasing the risk of hypothyroidism are age, 131I uptake and MMI pretreatment. The prognostic value of this last factor, however, depends on the degree of suppression of the extranodular thyroid parenchyma at the scan.</abstract><cop>Oxford, UK</cop><pub>Blackwell Science Ltd</pub><pmid>15730415</pmid><doi>10.1111/j.1365-2265.2005.02218.x</doi><tpages>5</tpages></addata></record>
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ispartof Clinical endocrinology (Oxford), 2005-03, Vol.62 (3), p.331-335
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subjects Adult
Age Factors
Aged
Antithyroid Agents - adverse effects
Biological and medical sciences
Disease Progression
Endocrinopathies
Epidemiologic Methods
Female
Fundamental and applied biological sciences. Psychology
Humans
Hyperthyroidism - radiotherapy
Hypothyroidism - etiology
Iodine Radioisotopes - adverse effects
Iodine Radioisotopes - therapeutic use
Male
Medical sciences
Methimazole - adverse effects
Middle Aged
Non tumoral diseases. Target tissue resistance. Benign neoplasms
Radiation Injuries - etiology
Thyroid Gland - physiology
Thyroid Nodule - radiotherapy
Thyroid. Thyroid axis (diseases)
Thyrotropin - blood
Treatment Outcome
Vertebrates: endocrinology
title Outcome of radioiodine-131 therapy in hyperfunctioning thyroid nodules: a 20 years' retrospective study
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