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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Endocrinol.</journal-id>
<journal-title-group>
<journal-title>Frontiers in Endocrinology</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Endocrinol.</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1664-2392</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/fendo.2026.1636824</article-id>
<article-version article-version-type="Version of Record" vocab="NISO-RP-8-2008"/>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Systematic Review</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>Radioactive iodine effects on ovarian reserve: a systematic review and metaanalysis</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" corresp="yes">
<name><surname>Bukhari</surname><given-names>Salwa Q.</given-names></name>
<xref ref-type="aff" rid="aff1"/>
<xref ref-type="corresp" rid="c001"><sup>*</sup></xref>
<uri xlink:href="https://loop.frontiersin.org/people/3063735/overview"/>
<role vocab="credit" vocab-identifier="https://credit.niso.org/" vocab-term="Writing &#x2013; original draft" vocab-term-identifier="https://credit.niso.org/contributor-roles/writing-original-draft/">Writing &#x2013; original draft</role>
<role vocab="credit" vocab-identifier="https://credit.niso.org/" vocab-term="Writing &#x2013; review &amp; editing" vocab-term-identifier="https://credit.niso.org/contributor-roles/writing-review-editing/">Writing &#x2013; review &amp; editing</role>
</contrib>
<contrib contrib-type="author">
<name><surname>Mirghani</surname><given-names>Hyder</given-names></name>
<xref ref-type="aff" rid="aff1"/>
<uri xlink:href="https://loop.frontiersin.org/people/3125491/overview"/>
<role vocab="credit" vocab-identifier="https://credit.niso.org/" vocab-term="Writing &#x2013; review &amp; editing" vocab-term-identifier="https://credit.niso.org/contributor-roles/writing-review-editing/">Writing &#x2013; review &amp; editing</role>
<role vocab="credit" vocab-identifier="https://credit.niso.org/" vocab-term="Writing &#x2013; original draft" vocab-term-identifier="https://credit.niso.org/contributor-roles/writing-original-draft/">Writing &#x2013; original draft</role>
</contrib>
</contrib-group>
<aff id="aff1"><institution>University of Tabuk</institution>, <city>Tabuk</city>,&#xa0;<country country="sa">Saudi Arabia</country></aff>
<author-notes>
<corresp id="c001"><label>*</label>Correspondence: Salwa Q. Bukhari, <email xlink:href="mailto:s.bukhari@ut.edu.sa">s.bukhari@ut.edu.sa</email></corresp>
</author-notes>
<pub-date publication-format="electronic" date-type="pub" iso-8601-date="2026-03-10">
<day>10</day>
<month>03</month>
<year>2026</year>
</pub-date>
<pub-date publication-format="electronic" date-type="collection">
<year>2026</year>
</pub-date>
<volume>17</volume>
<elocation-id>1636824</elocation-id>
<history>
<date date-type="received">
<day>03</day>
<month>09</month>
<year>2025</year>
</date>
<date date-type="accepted">
<day>23</day>
<month>02</month>
<year>2026</year>
</date>
<date date-type="rev-recd">
<day>22</day>
<month>02</month>
<year>2026</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2026 Bukhari and Mirghani.</copyright-statement>
<copyright-year>2026</copyright-year>
<copyright-holder>Bukhari and Mirghani</copyright-holder>
<license>
<ali:license_ref start_date="2026-03-10">https://creativecommons.org/licenses/by/4.0/</ali:license_ref>
<license-p>This is an open-access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution License (CC BY)</ext-link>. The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</license-p>
</license>
</permissions>
<abstract>
<sec>
<title>Background</title>
<p>Differentiated thyroid carcinoma (DTC) is common, and its rate is on the rise globally. Radioactive iodine, RAI (I-131), is widely used as an adjuvant therapy or for remnant ablation. There is growing awareness about the effects of RAI (I-131) on ovarian reserve.</p>
</sec>
<sec>
<title>Materials and methods</title>
<p>This meta-analysis aimed to evaluate whether RAI therapy impairs ovarian reserve as assessed by anti-M&#xfc;llerian hormone (AMH) and follicle-stimulating hormone (FSH) levels. A systematic literature search was conducted in PubMed, MEDLINE, Google Scholar, and EBSCO for relevant articles published in the English language. The literature search was conducted during October and November 2024, and the studies were included if they were published in the period from 2015 to 2024. The keywords used were ovarian reserve, ovarian function, female fertility, radioactive iodine, RAI (I-131), follicle-stimulating hormone (FSH), and anti-M&#xfc;llerian hormone (AMH). MeSH terms used: Iodine Radioisotopes, Ovarian Reserve, and Thyroid Neoplasms.</p>
</sec>
<sec>
<title>Result</title>
<p>Out of the two hundred and sixty-nine studies retrieved, 160 remained after duplication removal, of which 17 full texts were screened. However, only six studies (with 430 patients) were included in the final meta-analysis. AMH level were significantly lower after RAI (I-131) with a mean difference (MD) of 1.96. 95% <italic>CI</italic>, 0.53 to3.40. The levels were higher in the RAI (I-131) group after removing studies with significant heterogeneity, MD, 0.36. 95% <italic>CI</italic>, 0.17 to 0.55. FSH levels were significantly higher following RAI (I-131), MD -1.07, 95% <italic>CI</italic>, -2.02 to-0.13.</p>
</sec>
<sec>
<title>Conclusion</title>
<p>Current evidence shows a significant reduction in anti-M&#xfc;llerian hormone (AMH), and significant increase in FSH levels after RAI (I-131), but data are heterogeneous. Larger prospective studies with standardized outcome measures are needed.</p>
</sec>
</abstract>
<kwd-group>
<kwd>anti-M&#xfc;llerian hormone (AMH)</kwd>
<kwd>differentiated thyroid cancer</kwd>
<kwd>follicle-stimulating hormone (FSH)</kwd>
<kwd>ovarian reserve</kwd>
<kwd>radioactive iodine RAI (I-131)</kwd>
</kwd-group>
<funding-group>
<funding-statement>The author(s) declared that financial support was not received for this work and/or its publication.</funding-statement>
</funding-group>
<counts>
<fig-count count="4"/>
<table-count count="3"/>
<equation-count count="0"/>
<ref-count count="44"/>
<page-count count="8"/>
<word-count count="3185"/>
</counts>
<custom-meta-group>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Thyroid Endocrinology</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
<body>
<sec id="s1" sec-type="intro">
<title>Introduction</title>
<p>Differentiated thyroid carcinoma is common, and radioactive iodine RAI (I-131) therapy is used for ablation of thyroid remnants and treatment of persistent or recurrent&#xa0;disease. It has been used for more than 8 decades and has increased the disease-free survival rate (<xref ref-type="bibr" rid="B1">1</xref>).</p>
<p>Radioactive iodine RAI (I-131) use ought to be goal-oriented by the American and European associations; the goals are categorized as treatment of unknown disease, adjuvant, and remnant ablation (<xref ref-type="bibr" rid="B2">2</xref>, <xref ref-type="bibr" rid="B3">3</xref>). Remnant ablation improves the quality of further radioactive uptake and thyroglobulin levels; it is not intended to improve survival. In contrast, adjuvant therapy that removes microscopic foci after surgery is survival-oriented.</p>
<p>The majority of differentiated thyroid carcinomas can be managed by active surveillance or minimal surgery, and conventional intervention yielded no better outcomes (<xref ref-type="bibr" rid="B4">4</xref>, <xref ref-type="bibr" rid="B5">5</xref>).</p>
<p>For appropriately selected patients with small, low-risk DTC, recent evidence shows that several minimally invasive and remote-access approaches, including trans-oral vestibular approach thyroidectomy, axillary/areolar endoscopic, and some robotic techniques) can provide comparable short-term oncologic outcomes and complication rates to conventional open thyroidectomy while offering improved cosmesis and patient satisfaction, but they require greater operative time, specialized training/volume, careful patient selection, and sometimes show lower lymph-node yield or higher cost (<xref ref-type="bibr" rid="B6">6</xref>&#x2013;<xref ref-type="bibr" rid="B8">8</xref>).</p>
<p>RAI (I-131) is administered according to the risk stratification of thyroid cancer, and the dose is personalized and patient-specific. However, RAI (I-131) is costly, needs patient isolation, and is associated with long hospital stay, secondary malignancy, and women&#x2019;s infertility (<xref ref-type="bibr" rid="B9">9</xref>&#x2013;<xref ref-type="bibr" rid="B11">11</xref>). The effects of RAI (I-131) on women&#x2019;s reproductive health and fertility (ovarian reserve) are a matter of controversy (<xref ref-type="bibr" rid="B12">12</xref>, <xref ref-type="bibr" rid="B13">13</xref>). Ovarian reserve is a key determinant of fertility, influencing the chances of spontaneous conception. It predicts response to fertility treatments (e.g., IVF) and helps tailor stimulation protocols (<xref ref-type="bibr" rid="B14">14</xref>). Ovarian reserve reflects the quantity and quality of oocytes remaining within the ovaries at a given time and serves as a key determinant of female reproductive potential. Ovarian aging is characterized by a progressive depletion of the follicular pool accompanied by functional impairment of the remaining follicles. With advancing age, both follicular number and oocyte competence decline, leading to reduced fecundity and an increased risk of miscarriage. In clinical practice, diminished ovarian reserve is typically defined by biochemical thresholds, most commonly an anti-M&#xfc;llerian hormone (AMH) level &lt; 0.7 ng/mL and/or a follicle-stimulating hormone (FSH) level &gt; 15 IU/L (<xref ref-type="bibr" rid="B15">15</xref>, <xref ref-type="bibr" rid="B16">16</xref>). The AMH, which is the inhibitor of male reproductive structures during fetal development, is transforming growth factor beta (TGF-&#x3b2;) and is a marker of ovarian reserve in women (<xref ref-type="bibr" rid="B17">17</xref>). AMH plays an important role in female fertility and reproductive biology through the production of ovarian follicles (<xref ref-type="bibr" rid="B18">18</xref>). AMH plays an important role male sex differentiation by inducing the regression of the m&#xfc;llerian ducts, and it is the best marker of ovarian reserve. AMH is expressed by granulosa cells of growing follicles from the primary up to the small antral stage, then its expression disappears after the secretion of the secretion of follicle-stimulating hormone (FSH). However, some secretion continues in the cumulus cells of preovulatory follicles (<xref ref-type="bibr" rid="B19">19</xref>,&#xa0;<xref ref-type="bibr" rid="B20">20</xref>). FSH was identified in the 1980s as a suppressor of gonadotropin-releasing hormone induced by luteinizing hormone (LH), with urinary/serum FSH testing and AMH levels are commonly used biomarkers to assess ovarian reserve and estimate a woman&#x2019;s natural fertility potential (<xref ref-type="bibr" rid="B21">21</xref>, <xref ref-type="bibr" rid="B22">22</xref>). This meta-analysis aimed to evaluate whether RAI therapy impairs ovarian reserve as assessed by anti-M&#xfc;llerian hormone (AMH) and follicle-stimulating hormone (FSH) levels.</p>
</sec>
<sec id="s2">
<title>Methods</title>
<sec id="s2_1">
<title>Study design</title>
<p>Systematic review; the review was not registered in PROSPERO registration because of the retrospective design of the included studies.</p>
</sec>
<sec id="s2_2">
<title>Participants</title>
<p>Females who received RAI (I-131) for differentiated thyroid carcinoma.</p>
</sec>
<sec id="s2_3">
<title>Eligibility criteria according to PICOS</title>
<p>This meta-analysis was conducted during October and November 2024 in accordance with the PRISMA Recommendation <xref ref-type="fig" rid="f1"><bold>Figure&#xa0;1</bold></xref>.</p>
<fig id="f1" position="float">
<label>Figure&#xa0;1</label>
<caption>
<p>The effects of radioactive iodine RAI (I-131) (for differentiated thyroid carcinoma) on ovarian reserve (The PRISMA Chart).</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fendo-17-1636824-g001.tif">
<alt-text content-type="machine-generated">PRISMA flow diagram showing study selection: out of 269 records identified, 160 remained after removing duplicates, 143 were excluded during screening, leaving 17 full-text articles, of which 11 were excluded, resulting in 6 studies included in qualitative synthesis.</alt-text>
</graphic></fig>
</sec>
<sec id="s2_4">
<title>Inclusion criteria</title>
<p>We included cross-sectional studies, retrospective and prospective studies, and case-control studies assessing the effects of RAI (I-131) on ovarian reserve.</p>
</sec>
<sec id="s2_5">
<title>Exclusion criteria</title>
<p>Experts&#x2019; opinions, editorials, case reports, and series were excluded from the study.</p>
</sec>
<sec id="s2_6">
<title>Interventions</title>
<p>RAI (I-131), used for DTC.</p>
</sec>
<sec id="s2_7">
<title>Outcome measures</title>
<p>The effects of RAI (I-131) on ovarian reserve (the levels of FSH and AMH before and after RAI (I-131) were reported.</p>
</sec>
<sec id="s2_8">
<title>Comparators</title>
<p>Women who received radioactive iodine RAI (I-131) for differentiated thyroid carcinoma and controls.</p>
</sec>
<sec id="s2_9">
<title>Systematic review protocol</title>
<p>Not done.</p>
</sec>
<sec id="s2_10">
<title>Search strategy</title>
<p>The two authors independently searched PubMed, MEDLINE, Google Scholar, and EBSCO for relevant articles published in the English language. The literature search was conducted during October and November 2024, and publications published in the last ten years (from 2015 up to 2024) were included. The keywords used were ovarian reserve, ovarian function, female fertility, radioactive iodine RAI (I-131), follicle-stimulating hormone (FSH), and anti-M&#xfc;llerian hormone (AMH), MeSH terms Iodine Radioisotopes, Ovarian Reserve, Thyroid Neoplasms. Two hundred and sixty-nine studies were retrieved, and one hundred and sixty remained after duplication removal; of them, 17 full texts were screened. However, only six studies were included in the final meta-analysis. Eight reviews and three texts without comparisons were excluded. The two authors (S. B and H. M blindly searched the literature, the excluded studies were discussed, and any discrepancy was solved by agreement.</p>
</sec>
<sec id="s2_11">
<title>Data sources</title>
<p>PubMed, MEDLINE, Google Scholar, and EBSCO.</p>
</sec>
<sec id="s2_12">
<title>Data extraction</title>
<p>A structured checklist was used to gather the author&#x2019;s name, country, year of publication, and the levels of FSH and AMH before and after RAI (I-131) <xref ref-type="table" rid="T1"><bold>Table&#xa0;1</bold></xref>.</p>
<table-wrap id="T1" position="float">
<label>Table&#xa0;1</label>
<caption>
<p>The effects of Radioactive iodine RAI (I-131), on Anti-M&#xfc;llerian hormone (AMH) and follicle-stimulating hormone (FSH).</p>
</caption>
<table frame="hsides">
<thead>
<tr>
<th valign="middle" align="center">Author</th>
<th valign="middle" align="center">Country</th>
<th valign="middle" align="center">Type of Study</th>
<th valign="middle" align="center">Age/years cases</th>
<th valign="middle" align="center">Age/years control</th>
<th valign="middle" align="center">Follow-up</th>
<th valign="middle" align="center">Anti-M&#xfc;llerian hormone before ng/mL</th>
<th valign="middle" align="center">Anti-M&#xfc;llerian hormone after ng/mL</th>
<th valign="middle" align="center">Number of patients</th>
<th valign="middle" align="center">Number of controls</th>
</tr>
</thead>
<tbody>
<tr>
<th valign="middle" colspan="10" align="center">The effects of Radioactive iodine RAI (I-131), on Anti-M&#xfc;llerian hormone (AMH)/mIU/mL</th>
</tr>
<tr>
<td valign="middle" align="center">Adamska et&#xa0;al., 2021 (<xref ref-type="bibr" rid="B23">23</xref>)</td>
<td valign="middle" align="center">Poland</td>
<td valign="middle" align="center">Prospective</td>
<td valign="middle" align="center">33</td>
<td valign="middle" align="center">33</td>
<td valign="middle" align="center">12 months</td>
<td valign="middle" align="center">2.7 &#xb1; 1.1</td>
<td valign="middle" align="center">1.85 &#xb1; 1.45</td>
<td valign="middle" align="center">25</td>
<td valign="middle" align="center">25</td>
</tr>
<tr>
<td valign="middle" align="center">Evranos et&#xa0;al., 2018 (<xref ref-type="bibr" rid="B24">24</xref>)</td>
<td valign="middle" align="center">Turkey</td>
<td valign="middle" align="center">Prospective</td>
<td valign="middle" align="center">31.15 &#xb1; 4.83</td>
<td valign="middle" align="center">31.15 &#xb1; 4.83</td>
<td valign="middle" align="center">19months</td>
<td valign="middle" align="center">8.87 &#xb1; 12.1</td>
<td valign="middle" align="center">3.1 &#xb1; 3.01</td>
<td valign="middle" align="center">33</td>
<td valign="middle" align="center">33</td>
</tr>
<tr>
<td valign="middle" align="center">Giusti et&#xa0;al., 2018 (<xref ref-type="bibr" rid="B25">25</xref>)</td>
<td valign="middle" align="center">Italy</td>
<td valign="middle" align="center">Prospective</td>
<td valign="middle" align="center">40.7 &#xb1; 6.7 7.4</td>
<td valign="middle" align="center">41.6 &#xb1;</td>
<td valign="middle" align="center">7.1 &#xb1; 0.9 years</td>
<td valign="middle" align="center">17.5&#x2009;&#xb1;&#x2009;4.7</td>
<td valign="middle" align="center">10.7&#x2009;&#xb1;&#x2009;1.7</td>
<td valign="middle" align="center">23</td>
<td valign="middle" align="center">34</td>
</tr>
<tr>
<td valign="middle" align="center">Hosseini et&#xa0;al., 2023 (<xref ref-type="bibr" rid="B26">26</xref>)</td>
<td valign="middle" align="center">Iran</td>
<td valign="middle" align="center">Prospective</td>
<td valign="middle" align="center">29.53 &#xb1; 4.53</td>
<td valign="middle" align="center">29.53 &#xb1; 4.53</td>
<td valign="middle" align="center">12 months</td>
<td valign="middle" align="center">2.25&#x2009;&#xb1;&#x2009;0.55</td>
<td valign="middle" align="center">1.94&#x2009;&#xb1;&#x2009;0.58</td>
<td valign="middle" align="center">60</td>
<td valign="middle" align="center">60</td>
</tr>
<tr>
<td valign="middle" align="center">Mittica et&#xa0;al., 2020 (<xref ref-type="bibr" rid="B27">27</xref>)</td>
<td valign="middle" align="center">Italy</td>
<td valign="middle" align="center">Prospective</td>
<td valign="middle" align="center">41.2&#x2009;&#xb1;&#x2009;7.5</td>
<td valign="middle" align="center">42.4&#x2009;&#xb1;&#x2009;9.2</td>
<td valign="middle" align="center">24 months</td>
<td valign="middle" align="center">8.71&#x2009;&#xb1;&#x2009;10.54</td>
<td valign="middle" align="center">9.97&#x2009;&#xb1;&#x2009;11.46</td>
<td valign="middle" align="center">30</td>
<td valign="middle" align="center">59</td>
</tr>
<tr>
<td valign="middle" align="center">Yaish et&#xa0;al., 2018 (<xref ref-type="bibr" rid="B28">28</xref>)</td>
<td valign="middle" align="center">Israel</td>
<td valign="middle" align="center">Prospective</td>
<td valign="middle" align="center">34</td>
<td valign="middle" align="center">34</td>
<td valign="middle" align="center">12 months</td>
<td valign="middle" align="center">3.25 &#xb1; 2.75</td>
<td valign="middle" align="center">2.36 &#xb1; 1.88</td>
<td valign="middle" align="center">24</td>
<td valign="middle" align="center">24</td>
</tr>
<tr>
<th valign="middle" colspan="10" align="center">The effects of Radioactive iodine RAI (I-131) on follicle-stimulating hormone (FSH)/mIU/ml</th>
</tr>
<tr>
<td valign="middle" align="center">Adamska et&#xa0;al., 2021 (<xref ref-type="bibr" rid="B23">23</xref>)</td>
<td valign="middle" align="center">Poland</td>
<td valign="middle" align="center">Prospective</td>
<td valign="middle" align="center">33</td>
<td valign="middle" align="center">33</td>
<td valign="middle" align="center">12 months</td>
<td valign="middle" align="center">5.7 &#xb1; 1.7</td>
<td valign="middle" align="center">6.75 &#xb1; 1.85</td>
<td valign="middle" align="center">25</td>
<td valign="middle" align="center">25</td>
</tr>
<tr>
<td valign="middle" align="center">Evranos et&#xa0;al., 2018 (<xref ref-type="bibr" rid="B24">24</xref>)</td>
<td valign="middle" align="center">Turkey</td>
<td valign="middle" align="center">Prospective</td>
<td valign="middle" align="center">31.15 &#xb1; 4.83</td>
<td valign="middle" align="center">31.15 &#xb1; 4.83</td>
<td valign="middle" align="center">19months</td>
<td valign="middle" align="center">9.64 &#xb1; 8.28</td>
<td valign="middle" align="center">12.45 &#xb1; 7.52</td>
<td valign="middle" align="center">33</td>
<td valign="middle" align="center">33</td>
</tr>
<tr>
<td valign="middle" align="center">Mittica et&#xa0;al., 2020 (<xref ref-type="bibr" rid="B27">27</xref>)</td>
<td valign="middle" align="center">Italy</td>
<td valign="middle" align="center">Prospective</td>
<td valign="middle" align="center">41.2&#x2009;&#xb1;&#x2009;7.5</td>
<td valign="middle" align="center">42.4&#x2009;&#xb1;&#x2009;9.2</td>
<td valign="middle" align="center">24 months</td>
<td valign="middle" align="center">15.3&#x2009;&#xb1;&#x2009;15.4</td>
<td valign="middle" align="center">12.6&#x2009;&#xb1;&#x2009;12.4</td>
<td valign="middle" align="center">30</td>
<td valign="middle" align="center">59</td>
</tr>
</tbody>
</table>
</table-wrap>
</sec>
<sec id="s2_13">
<title>Statistical analysis</title>
<p>The RevMan version 5.4, Oxford, United Kingdom, was used to analyze the continuous data from six studies to assess the effects of radioactive iodine (I-131) on FSH and AMH. The data were assessed, and the mean difference 95% confidence interval was used for Forest Plots, and Funnel Plots were generated for heterogeneity<italic>. I</italic><sup>2</sup> was used to assess the heterogeneity among studies (<italic>I</italic><sup>2</sup> &gt; 50% was considered high). The random effect was used for AMH due to the significant heterogeneity, and the fixed effect was used for the FSH arm because of non-significant heterogeneity. The chi-squared test and the weighted average effect size (Z) were calculated. A sub-analysis was used for the AMH outcome by excluding studies contributing most to heterogeneity (by assessing Heterogeneity Impact, and removing outliers with extreme effect size, then we checked if heterogeneity (I&#xb2;) decreases and whether the pooled effect size changes. A P-value of &lt; 0.05 was considered significant.</p>
</sec>
<sec id="s2_14">
<title>Risk of bias assessment and quality of evidence</title>
<p>The Newcastle Ottawa Scale risk of bias assessment was used (<xref ref-type="bibr" rid="B29">29</xref>). All the included studies were of good quality. The GRADE Evidence was used to the assess the grade of evidence <xref ref-type="table" rid="T2"><bold>Tables&#xa0;2</bold></xref>, <xref ref-type="table" rid="T3"><bold>3</bold></xref>.</p>
<table-wrap id="T2" position="float">
<label>Table&#xa0;2</label>
<caption>
<p>Newcastle Ottawa risk of bias of observational studies.</p>
</caption>
<table frame="hsides">
<thead>
<tr>
<th valign="middle" align="center">Author</th>
<th valign="middle" align="center">Selection bias score</th>
<th valign="middle" align="center">Compatibility score</th>
<th valign="middle" align="center">Outcome bias score</th>
<th valign="middle" align="center">Overall bias score</th>
<th valign="middle" align="center">Quality</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="middle" align="center">Adamska et&#xa0;al., 2021 (<xref ref-type="bibr" rid="B23">23</xref>)</td>
<td valign="middle" align="center">4</td>
<td valign="middle" align="center">2</td>
<td valign="middle" align="center">3</td>
<td valign="middle" align="center">9</td>
<td valign="middle" align="center">Good</td>
</tr>
<tr>
<td valign="middle" align="center">Evranos et&#xa0;al., 2018 (<xref ref-type="bibr" rid="B24">24</xref>)</td>
<td valign="middle" align="center">4</td>
<td valign="middle" align="center">2</td>
<td valign="middle" align="center">3</td>
<td valign="middle" align="center">9</td>
<td valign="middle" align="center">Good</td>
</tr>
<tr>
<td valign="middle" align="center">Giusti et&#xa0;al., 2018 (<xref ref-type="bibr" rid="B25">25</xref>)</td>
<td valign="middle" align="center">4</td>
<td valign="middle" align="center">2</td>
<td valign="middle" align="center">3</td>
<td valign="middle" align="center">9</td>
<td valign="middle" align="center">Good</td>
</tr>
<tr>
<td valign="middle" align="center">Hosseini et&#xa0;al., 2023 (<xref ref-type="bibr" rid="B26">26</xref>)</td>
<td valign="middle" align="center">4</td>
<td valign="middle" align="center">2</td>
<td valign="middle" align="center">3</td>
<td valign="middle" align="center">9</td>
<td valign="middle" align="center">Good</td>
</tr>
<tr>
<td valign="middle" align="center">Mittica et&#xa0;al., 2020 (<xref ref-type="bibr" rid="B27">27</xref>)</td>
<td valign="middle" align="center">4</td>
<td valign="middle" align="center">2</td>
<td valign="middle" align="center">3</td>
<td valign="middle" align="center">9</td>
<td valign="middle" align="center">Good</td>
</tr>
<tr>
<td valign="middle" align="center">Yaish et&#xa0;al., 2018 (<xref ref-type="bibr" rid="B28">28</xref>)</td>
<td valign="middle" align="center">4</td>
<td valign="middle" align="center">2</td>
<td valign="middle" align="center">3</td>
<td valign="middle" align="center">9</td>
<td valign="middle" align="center">Good</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>12 months to.</p></fn>
</table-wrap-foot>
</table-wrap>
<table-wrap id="T3" position="float">
<label>Table&#xa0;3</label>
<caption>
<p>Analysis of the quality of evidence by Grading of Recommendations Assessment, Development, and Evaluation (GRADE).</p>
</caption>
<table frame="hsides">
<thead>
<tr>
<th valign="top" align="left">Outcome</th>
<th valign="top" align="left">Studies</th>
<th valign="top" align="left">Study design</th>
<th valign="top" align="left">Risk of bias</th>
<th valign="top" align="left">Inconsistency</th>
<th valign="top" align="left">Indirectness</th>
<th valign="top" align="left">Imprecision</th>
<th valign="top" align="left">Other considerations</th>
<th valign="top" align="left">Certainty of evidence</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">AMH</td>
<td valign="top" align="left">6</td>
<td valign="top" align="left">Prospective=4, case-control=2</td>
<td valign="top" align="left">serious</td>
<td valign="top" align="left">Serious (<italic>I<sup>2</sup></italic> = 90%)</td>
<td valign="top" align="left">Not serious</td>
<td valign="top" align="left">Not serious</td>
<td valign="top" align="left">None</td>
<td valign="top" align="left">Very low</td>
</tr>
<tr>
<td valign="top" align="left">FSH</td>
<td valign="top" align="left">3</td>
<td valign="top" align="left">Prospective=2, case-control=1</td>
<td valign="top" align="left">Serious</td>
<td valign="top" align="left">Not serious (<italic>I<sup>2</sup></italic> = 7%)</td>
<td valign="top" align="left">Not serious</td>
<td valign="top" align="left">Not serious</td>
<td valign="top" align="left">None</td>
<td valign="top" align="left">Very low</td>
</tr>
</tbody>
</table>
</table-wrap>
</sec>
</sec>
<sec id="s3" sec-type="results">
<title>Results</title>
<sec id="s3_1">
<title>Characteristics of the included studies</title>
<p>There were six studies, all were prospective studies, the follow-up period ranged from 12 months to 7.1 &#xb1; 0.9 years, three studies were published in Europe, and three from Asia, and the total number of patients were 430.</p>
</sec>
<sec id="s3_2">
<title>Findings</title>
<p>In the present meta-analysis, six studies on Anti-M&#xfc;llerian hormone (AMH) outcomes were included (<xref ref-type="bibr" rid="B23">23</xref>&#x2013;<xref ref-type="bibr" rid="B28">28</xref>). AMH was significantly lower after RAI (I-131) with a mean difference (MD) of 1.96. 95% <italic>CI</italic>, 0.53 to3.40, P-value for overall effect, and Z = 2.69, 0.007. A significant heterogeneity was observed, <italic>I</italic><sup>2</sup> = 90%, the Chi-square=48.49, the standard difference was 5, and the P-value for heterogeneity was &lt;0.001, <xref ref-type="fig" rid="f2"><bold>Figures&#xa0;2A, B</bold></xref>.</p>
<fig id="f2" position="float">
<label>Figure&#xa0;2</label>
<caption>
<p><bold>(A)</bold> (Forest Plot). Anti-M&#xfc;llerian hormone (AMH) among patients receiving radioactive iodine RAI (I-131) for differentiated thyroid carcinoma after 1 year of radioactive iodine treatment. <bold>(B)</bold> Anti-M&#xfc;llerian hormone (AMH) among patients receiving radioactive iodine RAI (I-131) for differentiated thyroid carcinoma after 1 year of radioactive iodine treatment (Funnel Plot).</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fendo-17-1636824-g002.tif">
<alt-text content-type="machine-generated">Panel A presents a forest plot summarizing six studies comparing Anti-M&#xfc;llerian Hormone (AMH) at baseline and after one year of radioactive iodine treatment, showing individual and pooled mean differences with confidence intervals. Panel B displays a funnel plot examining publication bias, with each study&#x2019;s standard error plotted against mean difference and points symmetrically distributed around zero.</alt-text>
</graphic></fig>
<p>A sub-analysis was conducted after removing studies with high heterogeneity in which the Anti-M&#xfc;llerian hormone (AMH) was lower in the RAI (I-131) therapy group compared to baseline and controls, MD, 0.36. 95% <italic>CI</italic>, 0.17 to 0.55, P-value for overall effect, 0.0003, and Z = 3.66, no significant heterogeneity was observed, <italic>I</italic><sup>2</sup>, 3%, Chi-square, 3.10, the standard difference was 3, and the P-value for heterogeneity was 0.38 <xref ref-type="fig" rid="f3"><bold>Figure&#xa0;3</bold></xref>.</p>
<fig id="f3" position="float">
<label>Figure&#xa0;3</label>
<caption>
<p>Anti-M&#xfc;llerian hormone (AMH) among patients receiving radioactive iodine RAI (I-131) for differentiated thyroid carcinoma (after removing studies with high contribution to heterogeneity).</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fendo-17-1636824-g003.tif">
<alt-text content-type="machine-generated">Forest plot and summary table comparing Anti-M&#xfc;llerian Hormone (AMH) levels at baseline and one year after radioactive iodine (RAI) treatment across four studies, showing a pooled mean difference of 0.36 with a 95 percent confidence interval of 0.17 to 0.55, minimal heterogeneity, and overall statistical significance.</alt-text>
</graphic></fig>
<p>Regarding follicle-stimulating hormone (FSH), only three studies were included (<xref ref-type="bibr" rid="B23">23</xref>, <xref ref-type="bibr" rid="B24">24</xref>, <xref ref-type="bibr" rid="B27">27</xref>) there was statistically significant increase after radioactive iodine RAI (I-131) (levels 30.64 versus 31.8), MD -1.07, 95% <italic>CI</italic>, -2.02 to-0.13, P-value for overall effect, 0.03, and Z = 2.23. No heterogeneity was observed, <italic>I</italic><sup>2</sup> = 7.0%, Chi-square, 2.15, the standard difference was 2, and the P-value for heterogeneity was 0.34 <xref ref-type="fig" rid="f4"><bold>Figure&#xa0;4</bold></xref>.</p>
<fig id="f4" position="float">
<label>Figure&#xa0;4</label>
<caption>
<p>Follicle-stimulating hormone (FSH) in women receiving radioactive iodine RAI (I-131) for differentiated thyroid carcinoma.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fendo-17-1636824-g004.tif">
<alt-text content-type="machine-generated">Forest plot and data table comparing FSH levels at baseline and after one year of RAI across three studies, showing a weighted mean difference of negative one point zero seven with a 95 percent confidence interval of negative two point zero two to negative zero point one three, indicating a statistically significant overall effect.</alt-text>
</graphic></fig>
</sec>
</sec>
<sec id="s4" sec-type="discussion">
<title>Discussion</title>
<p>In this meta-analysis, AMH was significantly lower after RAI (I-131) with a mean difference (MD) of 1.96. 95% <italic>CI</italic>, 0.53 to3.40. AMH were lower after removing studies with significant heterogeneity, MD, 0.36. 95% <italic>CI</italic>, 0.17 to 0.55. While FSH levels were significantly higher after radioactive iodine RAI (I-131) (levels 30.64 versus 31.8), MD -1.07, 95% <italic>CI</italic>, -2.02 to-0.13.</p>
<p>The current findings are in line with a meta-analysis that included only four studies and found a 1.50 ng/mL reduction of Anti-M&#xfc;llerian hormone (AMH) (<xref ref-type="bibr" rid="B10">10</xref>). Another meta-analysis included the same number of studies (four) and reported a decline in Anti-M&#xfc;llerian hormone (AMH) at three months following a single dose of radioactive iodine RAI (I-131). In addition, the low level persisted for one year. Anagnostis et&#xa0;al. (<xref ref-type="bibr" rid="B13">13</xref>) investigated the effects of radioactive iodine RAI (I-131) on follicle-stimulating hormone (FSH) and found no significant effects at three, six months, and one year, their findings were contradicting the current findings in which FSH levels were significantly higher after RAI (I-131). Importantly, Anagnostis and colleagues included only data from two studies post-radioactive iodine RAI (I-131). In addition, there was a substantial heterogeneity (96.8%).</p>
<p>Wu et&#xa0;al. (<xref ref-type="bibr" rid="B30">30</xref>) conducted a large retrospective study that found a decreased birth rate among women who received RAI (I-131), and the effect was greater among the older age group. Similarly, previous studies reported metrorrhagia, oligomenorrhea, and amenorrhea in 20-30% of women receiving radioactive iodine RAI (I-131). However, the changes were temporary and usually did not exceed one year (<xref ref-type="bibr" rid="B31">31</xref>&#x2013;<xref ref-type="bibr" rid="B33">33</xref>).</p>
<p>Another piece of evidence of the negative impact of RAI (I-131) on ovarian reserve is the findings of Ceccarelli et&#xa0;al. (<xref ref-type="bibr" rid="B34">34</xref>), who observed a decreased fertility period among women receiving this modality of therapy. The advancement in menopause observed by the authors implies a negative effect on ovarian reserve. Given the current findings, a shared decision with women who are planning to receive radioactive iodine RAI (I-131) is of paramount significance, and counseling regarding reproductive health is vital.</p>
<p>Radioactive iodine RAI (I-131) is widely used in differentiated thyroid carcinoma at different doses (<xref ref-type="bibr" rid="B35">35</xref>). However, RAI (I-131) is not without side effects; the side effects range from salivary gland pain, xerostomia, and sialadenitis to secondary malignancies and ovarian failure (<xref ref-type="bibr" rid="B36">36</xref>). The important concern regarding RAI (I-131) use is its effects on ovarian reserve (AMH and FSH).</p>
<p>The effects of RAI (I-131) on AMH and FSH are due to its gonadotoxic effects. The primary mechanism involves radiation-induced oxidative stress and direct DNA damage to ovarian follicles, leading to apoptosis of granulosa cells and depletion of the primordial follicle pool. As ovarian follicular function declines, negative feedback inhibition on the hypothalamic-pituitary axis is reduced, leading to compensatory elevations in follicle-stimulating hormone (FSH) levels (<xref ref-type="bibr" rid="B7">7</xref>, <xref ref-type="bibr" rid="B12">12</xref>).</p>
<p>Anti-M&#xfc;llerian hormone (AMH) is the most sensitive indicator of ovarian reserve due to its intracycle and intercycle variability. AMH is sensitized in granulosa cells of the growing ovarian follicles, and decreases progressively with increasing age, and shows the lowest level before menopause (<xref ref-type="bibr" rid="B36">36</xref>).</p>
<p>Ovarian reserve studies are an important option for women who have not yet fulfilled their reproductive goals before receiving radioactive iodine RAI (I-131) therapy (<xref ref-type="bibr" rid="B37">37</xref>). The American Society of Clinical Oncology (ASCO) recommends offering oocyte cryopreservation for fertility preservation in women at risk of diminished ovarian reserve (<xref ref-type="bibr" rid="B38">38</xref>, <xref ref-type="bibr" rid="B39">39</xref>). Therefore, it is advisable that women scheduled for RAI (I-131), particularly those of reproductive age, undergo baseline assessment of ovarian reserve markers such as anti-M&#xfc;llerian hormone (AMH) and follicle-stimulating hormone (FSH). If results suggest reduced reserve, fertility preservation measures (including oocyte or embryo cryopreservation) should be discussed before therapy.</p>
<p>A multidisciplinary approach involving endocrinologists, oncologists, reproductive specialists, and surgeons is essential for individualized decision-making. Proper patient selection is critical, especially among those with low to intermediate risk differentiated thyroid carcinoma (DTC), where the benefit of RAI (I-131) in preventing recurrence remains controversial (<xref ref-type="bibr" rid="B3">3</xref>, <xref ref-type="bibr" rid="B40">40</xref>, <xref ref-type="bibr" rid="B41">41</xref>). Given that RAI (I-131) distributes systemically during both uptake and elimination, it can cause various complications such as xerostomia, dysgeusia, sialadenitis, gonadal dysfunction, and, rarely, secondary malignancies and infertility (<xref ref-type="bibr" rid="B42">42</xref>&#x2013;<xref ref-type="bibr" rid="B44">44</xref>).</p>
<p>Hence, for women of childbearing age, shared decision-making should include counseling on the potential impact of RAI (I-131) on fertility, consideration of delaying therapy until after fertility preservation when feasible, use of the lowest effective RAI (I-131) dose, and post-treatment monitoring of ovarian function. Such individualized care ensures that the therapeutic benefits are balanced against reproductive and long-term risks.</p>
<p>The strength of our study is that we included the largest number of studies, included the most recent updates, and found no effect of radioactive iodine RAI (I-131) on follicle-stimulating hormone (FSH), supporting the previous meta-analysis.</p>
<sec id="s4_1">
<title>Study limitations</title>
<p>The study limitations were the small number of included studies, the difference in the follow-up period in the included studies, variable Anti-M&#xfc;llerian hormone (AMH) assays, lack of long-term follow-up, and the significant heterogeneity observed. The source of heterogeneity observed in this study could be due to differences in RAI (I-131) dose, age of the patients, timing, and duration of the included studies.</p>
</sec>
</sec>
<sec id="s5" sec-type="conclusions">
<title>Conclusion</title>
<p>Although RAI (I-131) therapy appears to transiently reduce Anti-M&#xfc;llerian hormone (AMH) levels, the clinical impact on fertility remains uncertain. Follicle-stimulating hormone (FSH) were higher after RAI (I-131). Larger prospective studies using standardized Anti-M&#xfc;llerian hormone (AMH) assays and dose stratification are required to confirm these findings.</p>
</sec>
</body>
<back>
<sec id="s6" sec-type="data-availability">
<title>Data availability statement</title>
<p>The datasets presented in this study can be found in online repositories. The names of the repository/repositories and accession number(s) can be found in the article/supplementary material.</p></sec>
<sec id="s7" sec-type="author-contributions">
<title>Author contributions</title>
<p>SQ: Writing &#x2013; original draft, Writing &#x2013; review &amp; editing. HM: Writing &#x2013; review &amp; editing, Writing &#x2013; original draft.</p></sec>
<sec id="s9" sec-type="COI-statement">
<title>Conflict of interest</title>
<p>The authors declared that this work was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p></sec>
<sec id="s10" sec-type="ai-statement">
<title>Generative AI statement</title>
<p>The author(s) declared that generative AI was not used in the creation of this manuscript.</p>
<p>Any alternative text (alt text) provided alongside figures in this article has been generated by Frontiers with the support of artificial intelligence and reasonable efforts have been made to ensure accuracy, including review by the authors wherever possible. If you identify any issues, please contact us.</p></sec>
<sec id="s11" sec-type="disclaimer">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p></sec>
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<p>Edited by: <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/239399">Tamer Saad Kaoud</ext-link>, The University of Texas at Austin, United States</p></fn>
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<p><ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/3231691">Ghina Hussein</ext-link>, Al-Muthana University, Iraq</p>
<p><ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/3331763">Reaid Hasan</ext-link>, University of Arkansas for Medical Sciences, United States</p></fn>
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