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<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Pharmacol.</journal-id>
<journal-title>Frontiers in Pharmacology</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Pharmacol.</abbrev-journal-title>
<issn pub-type="epub">1663-9812</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="publisher-id">1524214</article-id>
<article-id pub-id-type="doi">10.3389/fphar.2025.1524214</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Pharmacology</subject>
<subj-group>
<subject>Systematic Review</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Comparative effectiveness and safety of tofacitinib vs. adalimumab in patients with rheumatoid arthritis: A systematic review and meta-analysis</article-title>
<alt-title alt-title-type="left-running-head">Zhu et al.</alt-title>
<alt-title alt-title-type="right-running-head">
<ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fphar.2025.1524214">10.3389/fphar.2025.1524214</ext-link>
</alt-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Zhu</surname>
<given-names>Chunyan</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
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<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Zheng</surname>
<given-names>Yibo</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
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</contrib>
<contrib contrib-type="author">
<name>
<surname>Wang</surname>
<given-names>Zilu</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/investigation/"/>
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<contrib contrib-type="author">
<name>
<surname>Chen</surname>
<given-names>Guozong</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
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<contrib contrib-type="author" corresp="yes">
<name>
<surname>Li</surname>
<given-names>Yushi</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="corresp" rid="c001">&#x2a;</xref>
<uri xlink:href="https://loop.frontiersin.org/people/2888729/overview"/>
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<aff id="aff1">
<sup>1</sup>
<institution>Department of Rheumatism and immunology</institution>, <institution>Dongying People&#x2019;s Hospital (Dongying Hospital of Shandong Provincial Hospital Group)</institution>, <addr-line>Dongying</addr-line>, <addr-line>Shandong</addr-line>, <country>China</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Department of Rehabilitation Medicine</institution>, <institution>Dongying People&#x2019;s Hospital (Dongying Hospital of Shandong Provincial Hospital Group)</institution>, <addr-line>Dongying</addr-line>, <addr-line>Shandong</addr-line>, <country>China</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>
<bold>Edited by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/11428/overview">Stefania Tacconelli</ext-link>, University of Studies G.d&#x2019;Annunzio Chieti and Pescara, Italy</p>
</fn>
<fn fn-type="edited-by">
<p>
<bold>Reviewed by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/483892/overview">Marc Henri De Longueville</ext-link>, UCB Pharma, Belgium</p>
<p>
<ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/991080/overview">Moetaza M. Soliman</ext-link>, Mansoura University, Egypt</p>
<p>
<ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/1568895/overview">Caroline Tianeze de Castro</ext-link>, Federal University of Bahia, Brazil</p>
</fn>
<corresp id="c001">&#x2a;Correspondence: Yushi Li, <email>liyushi2304@163.com</email>
</corresp>
</author-notes>
<pub-date pub-type="epub">
<day>09</day>
<month>06</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="collection">
<year>2025</year>
</pub-date>
<volume>16</volume>
<elocation-id>1524214</elocation-id>
<history>
<date date-type="received">
<day>07</day>
<month>11</month>
<year>2024</year>
</date>
<date date-type="accepted">
<day>28</day>
<month>05</month>
<year>2025</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2025 Zhu, Zheng, Wang, Chen and Li.</copyright-statement>
<copyright-year>2025</copyright-year>
<copyright-holder>Zhu, Zheng, Wang, Chen and Li</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). 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.</p>
</license>
</permissions>
<abstract>
<sec>
<title>Objectives</title>
<p>To provide the latest systematic review and meta-analysis comparing the effectiveness and safety of tofacitinib and adalimumab in rheumatoid arthritis (RA) patients.</p>
</sec>
<sec>
<title>Methods</title>
<p>A systematic search of PubMed, Embase, Web of Science, and Cochrane databases was conducted until April 2025. Randomized controlled trials and cohorts comparing tofacitinib and adalimumab in RA patients were included. Outcomes assessed were significant improvements in American College of Rheumatology (ACR) 20 improvement criteria, changes in visual analog scale (VAS) (global activity), disease activity score (DAS) 28-C-reactive protein (CRP), Health Assessment Questionnaire-Disability Index (HAQ-DI), and adverse events. Sensitivity analyses and subgroup analysis evaluated the robustness of results and heterogeneity. Data analysis was performed using Review Manager 5.4.1 and STATA 15.0.</p>
</sec>
<sec>
<title>Results</title>
<p>Nine studies with 24,643 patients were analyzed. Tofacitinib showed superior effectiveness over adalimumab in ACR20 (risk ratio (RR): 1.28; 95% CI: 1.06, 1.55; P &#x3d; 0.01), HAQ-DI (standardized mean difference (SMD): 0.20; 95% CI: 0.35, &#x2212;0.05; P &#x3d; 0.008), and VAS (SMD: 0.30; 95% CI: 0.56, &#x2212;0.03; P &#x3d; 0.03). No significant differences were found in adverse events (RR: 0.96; 95% CI: 0.89, 1.03; P &#x3d; 0.22) or DSA28-CRP improvement (SMD: 0.02; 95% CI: 0.45, 0.02; P &#x3d; 0.07). Sensitivity analyses confirmed stable outcomes for adverse events, HAQ-DI, and ACR20, but instability for VAS and DSA28-CRP. Subgroup analysis found that tofacitinib &#x3e;5&#xa0;mg twice daily was superior to &#x2264;5&#xa0;mg in terms of ACR20.</p>
</sec>
<sec>
<title>Conclusion</title>
<p>Tofacitinib was more effective than adalimumab in improving ACR20, VAS, and HAQ-DI, with no significant differences in adverse events or DSA28-CRP improvement.</p>
</sec>
<sec>
<title>Systematic Review Registration:</title>
<p>
<ext-link ext-link-type="uri" xlink:href="https://www.crd.york.ac.uk/PROSPERO/">https://www.crd.york.ac.uk/PROSPERO/</ext-link>.</p>
</sec>
</abstract>
<kwd-group>
<kwd>tofacitinib</kwd>
<kwd>adalimumab</kwd>
<kwd>rheumatoid arthritis</kwd>
<kwd>meta-analysis</kwd>
<kwd>systematic review</kwd>
</kwd-group>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Inflammation Pharmacology</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1">
<title>1 Introduction</title>
<p>Rheumatoid arthritis (RA) is a chronic systemic autoimmune disease marked by persistent synovitis, pannus formation, and destruction of cartilage and bone (<xref ref-type="bibr" rid="B36">Zhu and Zhou, 2024</xref>; <xref ref-type="bibr" rid="B33">Vittecoq et al., 2024</xref>). The exact cause and mechanism in RA patients remain unknown. Clinically, it presents as symmetrical joint swelling, pain, and stiffness, potentially leading to joint deformities in advanced stages (<xref ref-type="bibr" rid="B28">Soriano et al., 2024</xref>). RA is prevalent worldwide, with varying rates across regions. Current early treatment primarily involves five classes of drugs: NSAIDs, csDMARDs, tsDMARDs, bDMARDs, and glucocorticoids (<xref ref-type="bibr" rid="B24">Qi et al., 2024</xref>; <xref ref-type="bibr" rid="B16">Han et al., 2024</xref>). Among them, adalimumab and tofacitinib are representative drugs of bDMARDs and tsDMARDs, respectively.</p>
<p>Adalimumab, the first fully humanized monoclonal antibody, binds specifically to TNF-&#x3b1; and effectively inhibits this cytokine (<xref ref-type="bibr" rid="B35">Zhang et al., 2024</xref>). The main risks of adalimumab include opportunistic infections and injection site reactions, and studies have shown that the incidence of serious infections is comparable to the underlying risk of rheumatoid arthritis (<xref ref-type="bibr" rid="B27">Smolen et al., 2024</xref>; <xref ref-type="bibr" rid="B8">Conde-Aranda et al., 2024</xref>; <xref ref-type="bibr" rid="B20">Lakhmiri et al., 2024</xref>). Tofacitinib, a first-generation oral drug, selectively inhibits JAK1 and JAK3, exerting less influence on JAK2 and TYK2 (<xref ref-type="bibr" rid="B25">Shih et al., 2024</xref>). Tofacitinib was first approved by the FDA for the treatment of RA in November 2012. Research indicates that tofacitinib is effective as a monotherapy or combined with DMARDs for RA treatment. The US FDA has approved tofacitinib for RA patients unresponsive to MTX (<xref ref-type="bibr" rid="B14">Fournier et al., 2024</xref>; <xref ref-type="bibr" rid="B6">Chang and Wang, 2024</xref>). In January 2017, after reviewing long-term safety and efficacy data, the European Medicines Agency proposed approving tofacitinib for RA treatment. In 2016, the FDA approved an extended-release tofacitinib formulation administered via an osmotic system for RA treatment (<xref ref-type="bibr" rid="B5">Boussaa et al., 2024</xref>; <xref ref-type="bibr" rid="B1">Adami et al., 2024</xref>). However, in February 2019, the FDA issued a safety alert regarding dose-dependent thrombosis and mortality risks with JAK inhibitors, which originated from the ORAL Surveillance study of tofacitinib in rheumatoid arthritis (RA) patients. Subsequent regulatory actions extended this boxed warning to the entire JAK inhibitor class (including baricitinib and upadacitinib), mandating restricted use in patients with cardiovascular risk factors regardless of specific indications (<xref ref-type="bibr" rid="B18">Kim et al., 2023</xref>; <xref ref-type="bibr" rid="B13">Fleischmann et al., 2017</xref>; <xref ref-type="bibr" rid="B32">van Vollenhoven et al., 2012</xref>; <xref ref-type="bibr" rid="B12">Fleischmann et al., 2012</xref>). A 24-week double-blind phase IIb study by <xref ref-type="bibr" rid="B12">Fleischmann et al. (2012)</xref> found that tofacitinib monotherapy (&#x2265;5&#xa0;mg, twice daily) effectively treated active RA for over 24 weeks with manageable safety, compared to adalimumab (<xref ref-type="bibr" rid="B12">Fleischmann et al., 2012</xref>). Another study reported similar ACR20 outcomes for tofacitinib and adalimumab in RA treatment (<xref ref-type="bibr" rid="B13">Fleischmann et al., 2017</xref>).</p>
<p>Despite numerous clinical studies comparing tofacitinib and adalimumab for RA, evidence-based data confirming their relative advantages and disadvantages remains insufficient. This study aims to compare adalimumab and tofacitinib regarding clinical efficacy, disease activity, quality of life, and safety through systematic review and meta-analysis, providing clinicians with a reference for selecting treatments. The goal is to identify a regimen with rapid onset, strong efficacy, good safety, and low cost for RA patients.</p>
</sec>
<sec sec-type="methods" id="s2">
<title>2 Methods</title>
<sec id="s2-1">
<title>2.1 Literature search</title>
<p>This meta-analysis followed the PRISMA 2020 guidelines (<xref ref-type="bibr" rid="B23">Page et al., 2021</xref>) and is registered in PROSPERO (CRD42024605000). A systematic literature search was conducted in PubMed, Embase, Web of Science, and Cochrane up to April 2025 for studies comparing adalimumab and tofacitinib in rheumatoid arthritis patients. The search terms used were &#x201c;adalimumab,&#x201d; &#x201c;tofacitinib,&#x201d; and &#x201c;rheumatoid arthritis.&#x201d; Detailed search strategies are provided in <xref ref-type="sec" rid="s12">Supplementary Table S1</xref>. Additionally, we manually screened the reference lists of included studies. Two authors independently retrieved and assessed eligible articles, resolving any discrepancies through discussion.</p>
</sec>
<sec id="s2-2">
<title>2.2 Inclusion and exclusion criteria</title>
<p>Articles were included if they met the following criteria: P (Population): patients with rheumatoid arthritis; I (Intervention): tofacitinib; C (Comparison): adalimumab; O (Outcome): American College of Rheumatology (ACR) 20, change in patient-reported visual analog scale (VAS) (global activity), disease activity score (DAS) 28-C-reactive protein (CRP), change in Health Assessment Questionnaire-Disability Index (HAQ-DI), and adverse events, etc.; S (Study design): randomized controlled trials and cohort studies. Exclusion criteria included study protocols, unpublished or non-original studies (e.g., meeting abstracts, corrections, replies), single-arm studies, studies with insufficient data, and reviews.</p>
</sec>
<sec id="s2-3">
<title>2.3 Data abstraction</title>
<p>Data abstraction was independently performed by two authors, with discrepancies resolved by a third author. Abstracted data included: first author, publication year, research period, region, study design, registration number, population, intervention/exposure, control, sample size, age, gender, disease duration, follow-up, ACR20, VAS changes, DAS28-CRP changes, HAQ-DI changes, and adverse events. If data were incomplete, corresponding authors were contacted for additional information.</p>
</sec>
<sec id="s2-4">
<title>2.4 Quality evaluation</title>
<p>Risk of bias (RoB) tool for RCT quality evaluation followed the Cochrane Handbook for Systematic Reviews of Interventions 5.1.0, considering seven domains: randomization sequence generation, allocation concealment, participant and personnel blinding, outcome assessment blinding, incomplete outcome data, selective reporting, and other potential bias sources (<xref ref-type="bibr" rid="B9">Cumpston et al., 2019</xref>). Each aspect was rated as low, high, or unclear risk. Studies with more &#x201c;low risk&#x201d; evaluations were considered superior. Cohort study quality was assessed using the Newcastle-Ottawa Scale (NOS) (<xref ref-type="bibr" rid="B34">Wells et al., 2011</xref>), with scores of seven to nine indicating high quality (<xref ref-type="bibr" rid="B19">Kim et al., 2019</xref>). Two authors independently evaluated the quality of all included studies, resolving disagreements through discussion.</p>
</sec>
<sec id="s2-5">
<title>2.5 Statistical analysis</title>
<p>Data synthesis was conducted using Review Manager 5.4.1. Standardized mean difference (SMD) was applied for continuous data, and risk ratio (RR) for dichotomous data. We measured improvement in all continuous variables by calculating the change from baseline to the last follow-up visit. Each metric was reported with 95% CIs using a random-effects model. Heterogeneity across outcomes was assessed using the chi-squared (&#x3c7;<sup>2</sup>) test (Cochran&#x2019;s Q) and the inconsistency index (<xref ref-type="bibr" rid="B17">Higgins and Thompson, 2002</xref>). Substantial heterogeneity was defined as a &#x3c7;<sup>2</sup> P value below 0.1 or an I<sup>2</sup> over 50%. For outcomes with more than two studies, sensitivity analysis was performed to assess the impact of individual studies on the overall results. In addition, subgroup analyses were performed to explore the stability of the results and potential sources of heterogeneity.</p>
</sec>
</sec>
<sec sec-type="results" id="s3">
<title>3 Results</title>
<sec id="s3-1">
<title>3.1 Literature retrieval, study characteristics, and baseline</title>
<p>
<xref ref-type="fig" rid="F1">Figure 1</xref> illustrates the flowchart of literature retrieval and selection. A total of 2,360 studies from PubMed (n &#x3d; 157), Embase (n &#x3d; 1,530), Web of Science (n &#x3d; 567), and Cochrane (n &#x3d; 106) were identified through a systematic search. After removing duplicates, 1,773 titles and abstracts were screened. Ultimately, nine studies (including 14 comparison groups) (<xref ref-type="bibr" rid="B18">Kim et al., 2023</xref>; <xref ref-type="bibr" rid="B13">Fleischmann et al., 2017</xref>; <xref ref-type="bibr" rid="B32">van Vollenhoven et al., 2012</xref>; <xref ref-type="bibr" rid="B12">Fleischmann et al., 2012</xref>; <xref ref-type="bibr" rid="B10">Deakin et al., 2023</xref>; <xref ref-type="bibr" rid="B2">Baker et al., 2023</xref>; <xref ref-type="bibr" rid="B3">Bergman et al., 2022</xref>; <xref ref-type="bibr" rid="B31">Takeuchi et al., 2021</xref>; <xref ref-type="bibr" rid="B29">Strand et al., 2019</xref>) involving 24,643 patients were included in the meta-analysis. Among them, six studies were RCTs and three studies were cohort studies. <xref ref-type="table" rid="T1">Table 1</xref> summarizes the characteristics of each eligible study. <xref ref-type="fig" rid="F2">Figure 2</xref> shows the quality evaluation of all included RCTs. Quality assessments for included cohorts are provided in <xref ref-type="sec" rid="s12">Supplementary Table S2</xref>.</p>
<fig id="F1" position="float">
<label>FIGURE 1</label>
<caption>
<p>Flowchart of the systematic search and selection process.</p>
</caption>
<graphic xlink:href="fphar-16-1524214-g001.tif"/>
</fig>
<table-wrap id="T1" position="float">
<label>TABLE 1</label>
<caption>
<p>Characteristics of included studies.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th rowspan="2" align="left">Study</th>
<th rowspan="2" align="left">Study period</th>
<th rowspan="2" align="left">Country</th>
<th rowspan="2" align="left">Study design</th>
<th rowspan="2" align="left">Registration number</th>
<th rowspan="2" align="left">Population</th>
<th rowspan="2" align="left">Intervention/exposure</th>
<th rowspan="2" align="left">Control</th>
<th colspan="2" align="left">Patients</th>
<th rowspan="2" align="left">Mean follow-up</th>
<th colspan="2" align="left">Mean/median age</th>
<th colspan="2" align="left">Male</th>
</tr>
<tr>
<th align="left">tofacitinib</th>
<th align="left">adalimumab</th>
<th align="left">tofacitinib</th>
<th align="left">adalimumab</th>
<th align="left">tofacitinib</th>
<th align="left">adalimumab</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left">Kim 2023</td>
<td align="left">2018&#x2013;2020</td>
<td align="left">Korea</td>
<td align="left">Cohort</td>
<td align="left">NCT03703817</td>
<td align="left">Patients aged &#x2265;19 years with patients who were taking tofacitinib or adalimumab for &#x2265;6 months</td>
<td align="left">tofacitinib</td>
<td align="left">adalimumab</td>
<td align="left">226</td>
<td align="left">99</td>
<td align="left">2 years</td>
<td align="left">53.56</td>
<td align="left">53.27</td>
<td align="left">28</td>
<td align="left">15</td>
</tr>
<tr>
<td align="left">Deakin 2023</td>
<td align="left">2015&#x2013;2021</td>
<td align="left">Australian</td>
<td align="left">RCT</td>
<td align="left">HC17799</td>
<td align="left">Australian adults aged 18 years or older with RA in the Optimising Patient Outcomes in Australian Rheumatology (OPAL) data set</td>
<td align="left">Tofacitinib (10&#xa0;mg daily)</td>
<td align="left">Adalimumab (40&#xa0;mg every 14 days)</td>
<td align="left">273</td>
<td align="left">569</td>
<td align="left">3 years</td>
<td align="left">59</td>
<td align="left">56</td>
<td align="left">72</td>
<td align="left">175</td>
</tr>
<tr>
<td align="left">Baker 2023</td>
<td align="left">2003&#x2013;2019</td>
<td align="left">United States</td>
<td align="left">Cohort</td>
<td align="left">NA</td>
<td align="left">Patients aged 18 years or older with RA</td>
<td align="left">tofacitinib</td>
<td align="left">adalimumab</td>
<td align="left">1565</td>
<td align="left">13,326</td>
<td align="left">1.8 years</td>
<td align="left">57.6</td>
<td align="left">52.7</td>
<td align="left">271</td>
<td align="left">3591</td>
</tr>
<tr>
<td align="left">Bergman 2023</td>
<td align="left">2018&#x2013;2022</td>
<td align="left">United States</td>
<td align="left">Cohort</td>
<td align="left">NA</td>
<td align="left">Adults (aged C 18 years) with C 1 RA diagnosis</td>
<td align="left">tofacitinib</td>
<td align="left">adalimumab</td>
<td align="left">1770</td>
<td align="left">3732</td>
<td align="left">12 months</td>
<td align="left">52.1</td>
<td align="left">49.7</td>
<td align="left">301</td>
<td align="left">897</td>
</tr>
<tr>
<td align="left">Takeuchi 2021</td>
<td align="left">NA</td>
<td align="left">Multi-center</td>
<td align="left">RCT</td>
<td align="left">NCT02187055</td>
<td align="left">Patients were &#x2265;18 years of age with active RA per ACR/EULAR criteria [9], despite receiving MTX for &#x2265;4 months before screening and at stable doses of 15&#x2013;25&#xa0;mg/week (&#x3c;15&#xa0;mg/week permitted only for safety reasons) for &#x2265;6 weeks before baseline</td>
<td align="left">Tofacitinib 5&#xa0;mg BID &#x2b; MTX</td>
<td align="left">ADA 40&#xa0;mg every other week &#x2b; MTX</td>
<td align="left">311</td>
<td align="left">314</td>
<td align="left">12 months</td>
<td align="left">NA</td>
<td align="left">NA</td>
<td align="left">NA</td>
<td align="left">NA</td>
</tr>
<tr>
<td align="left">Strand 2019</td>
<td align="left">NA</td>
<td align="left">Multi-center</td>
<td align="left">RCT</td>
<td align="left">NCT02187055</td>
<td align="left">&#x2265;18 years of age and met ACR/European League Against Rheumatism classification criteria for active RA.</td>
<td align="left">Oral tofacitinib was dosed at 5&#xa0;mg two times per day &#x2b; MTX</td>
<td align="left">Subcutaneous ADA was dosed at 40&#xa0;mg Q2W &#x2b; MTX</td>
<td align="left">376</td>
<td align="left">386</td>
<td align="left">NA</td>
<td align="left">NA</td>
<td align="left">NA</td>
<td align="left">NA</td>
<td align="left">NA</td>
</tr>
<tr>
<td align="left">Fleischmann 2017</td>
<td align="left">2014&#x2013;2015</td>
<td align="left">Multi-center</td>
<td align="left">RCT</td>
<td align="left">NCT02187055</td>
<td align="left">aged 18 years or older who met the 2010 ACR and EULAR classification criteria for rheumatoid arthritis20</td>
<td align="left">tofacitinib 5&#xa0;mg BID &#x2b; MTX</td>
<td align="left">ADA 40&#xa0;mg every other week &#x2b; MTX</td>
<td align="left">376</td>
<td align="left">386</td>
<td align="left">12 months</td>
<td align="left">50</td>
<td align="left">50</td>
<td align="left">65</td>
<td align="left">66</td>
</tr>
<tr>
<td align="left">van Vollenhoven 2012a</td>
<td align="left">2009&#x2013;2011</td>
<td align="left">Multi-center</td>
<td align="left">RCT</td>
<td align="left">NCT00853385</td>
<td align="left">18 years of age or older and had received a diagnosis of active rheumatoid arthritis</td>
<td align="left">5&#xa0;mg of tofacitinib twice daily</td>
<td align="left">40&#xa0;mg of adalimumab administered by subcutaneous injection once every 2 weeks</td>
<td align="left">204</td>
<td align="left">204</td>
<td align="left">6 months</td>
<td align="left">53</td>
<td align="left">52.5</td>
<td align="left">30</td>
<td align="left">42</td>
</tr>
<tr>
<td align="left">van Vollenhoven 2012b</td>
<td align="left">2009&#x2013;2011</td>
<td align="left">Multi-center</td>
<td align="left">RCT</td>
<td align="left">NCT00853385</td>
<td align="left">18 years of age or older and had received a diagnosis of active rheumatoid arthritis</td>
<td align="left">10&#xa0;mg of tofacitinib twice daily</td>
<td align="left">40&#xa0;mg of adalimumab administered by subcutaneous injection once every 2 weeks</td>
<td align="left">201</td>
<td align="left">204</td>
<td align="left">6 months</td>
<td align="left">52.9</td>
<td align="left">52.5</td>
<td align="left">33</td>
<td align="left">42</td>
</tr>
<tr>
<td align="left">Fleischmann 2012a</td>
<td align="left">NA</td>
<td align="left">Multi-center</td>
<td align="left">RCT</td>
<td align="left">NCT00550446</td>
<td align="left">&#x2265;18 years of age, had a diagnosis of RA for &#x2265;6 months</td>
<td align="left">1&#xa0;mg twice a day</td>
<td align="left">Injected subcutaneously at 40&#xa0;mg once every other week</td>
<td align="left">54</td>
<td align="left">53</td>
<td align="left">12 weeks</td>
<td align="left">55</td>
<td align="left">54</td>
<td align="left">8</td>
<td align="left">8</td>
</tr>
<tr>
<td align="left">Fleischmann 2012b</td>
<td align="left">NA</td>
<td align="left">Multi-center</td>
<td align="left">RCT</td>
<td align="left">NCT00550446</td>
<td align="left">&#x2265;18 years of age, had a diagnosis of RA for &#x2265;6 months</td>
<td align="left">3&#xa0;mg twice a day</td>
<td align="left">Injected subcutaneously at 40&#xa0;mg once every other week</td>
<td align="left">51</td>
<td align="left">53</td>
<td align="left">12 weeks</td>
<td align="left">53</td>
<td align="left">54</td>
<td align="left">7</td>
<td align="left">8</td>
</tr>
<tr>
<td align="left">Fleischmann 2012c</td>
<td align="left">NA</td>
<td align="left">Multi-center</td>
<td align="left">RCT</td>
<td align="left">NCT00550446</td>
<td align="left">&#x2265;18 years of age, had a diagnosis of RA for &#x2265;6 months</td>
<td align="left">5&#xa0;mg twice a day</td>
<td align="left">Injected subcutaneously at 40&#xa0;mg once every other week</td>
<td align="left">49</td>
<td align="left">53</td>
<td align="left">12 weeks</td>
<td align="left">54</td>
<td align="left">54</td>
<td align="left">6</td>
<td align="left">8</td>
</tr>
<tr>
<td align="left">Fleischmann 2012d</td>
<td align="left">NA</td>
<td align="left">Multi-center</td>
<td align="left">RCT</td>
<td align="left">NCT00550446</td>
<td align="left">&#x2265;18 years of age, had a diagnosis of RA for &#x2265;6 months</td>
<td align="left">10&#xa0;mg twice a day</td>
<td align="left">Injected subcutaneously at 40&#xa0;mg once every other week</td>
<td align="left">61</td>
<td align="left">53</td>
<td align="left">12 weeks</td>
<td align="left">52</td>
<td align="left">54</td>
<td align="left">8</td>
<td align="left">8</td>
</tr>
<tr>
<td align="left">Fleischmann 2012e</td>
<td align="left">NA</td>
<td align="left">Multi-center</td>
<td align="left">RCT</td>
<td align="left">NCT00550446</td>
<td align="left">&#x2265;18 years of age, had a diagnosis of RA for &#x2265;6 months</td>
<td align="left">15&#xa0;mg twice a day</td>
<td align="left">Injected subcutaneously at 40&#xa0;mg once every other week</td>
<td align="left">57</td>
<td align="left">53</td>
<td align="left">12 weeks</td>
<td align="left">53</td>
<td align="left">54</td>
<td align="left">7</td>
<td align="left">8</td>
</tr>
</tbody>
</table>
</table-wrap>
<fig id="F2" position="float">
<label>FIGURE 2</label>
<caption>
<p>Details of the quality evaluation for included RCTs.</p>
</caption>
<graphic xlink:href="fphar-16-1524214-g002.tif"/>
</fig>
</sec>
<sec id="s3-2">
<title>3.2 ACR20</title>
<p>ACR20 results were synthesized from three studies (7 comparison groups) involving 1,982 patients. Meta-analysis showed a significantly higher ACR20 in the tofacitinib group (RR: 1.28; 95% CI: 1.06, 1.55; P &#x3d; 0.01) with substantial heterogeneity (I<sup>2</sup> &#x3d; 74%, P &#x3d; 0.0008) (<xref ref-type="fig" rid="F3">Figure 3a</xref>).</p>
<fig id="F3" position="float">
<label>FIGURE 3</label>
<caption>
<p>Forest plots of <bold>(a)</bold> ACR20, <bold>(b)</bold> change in VAS, <bold>(c)</bold> change in DAS28-CRP.</p>
</caption>
<graphic xlink:href="fphar-16-1524214-g003.tif"/>
</fig>
</sec>
<sec id="s3-3">
<title>3.3 Change in VAS</title>
<p>VAS change data synthesis was performed in two studies (6 comparison groups) involving 1,299 patients. Meta-analysis showed a significantly greater reduction in VAS in the tofacitinib group (SMD: 0.30; 95% CI: 0.56, &#x2212;0.03; P &#x3d; 0.03) with substantial heterogeneity (I<sup>2</sup> &#x3d; 75%, P &#x3d; 0.001) (<xref ref-type="fig" rid="F3">Figure 3b</xref>).</p>
</sec>
<sec id="s3-4">
<title>3.4 Change in DAS28-CRP</title>
<p>Results of change in DAS28-CRP were synthesized from two studies (including six comparison groups) including 1,379 patients. Meta-analysis revealed a similar change in DAS28-CRP in the tofacitinib and adalimumab group (SMD: 0.02; 95% CI: 0.45, 0.02; <italic>P</italic> &#x3d; 0.07) with a significant heterogeneity (<italic>I</italic>
<sup>2</sup> &#x3d; 68%, <italic>P</italic> &#x3d; 0.007) (<xref ref-type="fig" rid="F3">Figure 3c</xref>).</p>
</sec>
<sec id="s3-5">
<title>3.5 Change in HAQ-DI</title>
<p>HAQ-DI change data synthesis was performed in four studies (9 comparison groups) involving 2,737 patients. Meta-analysis showed a significantly greater reduction in HAQ-DI in the tofacitinib group (SMD: 0.20; 95% CI: 0.35, &#x2212;0.05; P &#x3d; 0.008) with substantial heterogeneity (I<sup>2</sup> &#x3d; 69%, P &#x3d; 0.001) (<xref ref-type="fig" rid="F4">Figure 4a</xref>).</p>
<fig id="F4" position="float">
<label>FIGURE 4</label>
<caption>
<p>Forest plots of <bold>(a)</bold> change in HAQ-DI, <bold>(b)</bold> adverse events.</p>
</caption>
<graphic xlink:href="fphar-16-1524214-g004.tif"/>
</fig>
</sec>
<sec id="s3-6">
<title>3.6 Adverse events</title>
<p>Adverse events data were synthesized from five studies (10 comparison groups) involving 3,185 patients. Meta-analysis showed a similar adverse event rate between the tofacitinib and adalimumab groups (RR: 0.96; 95% CI: 0.89, 1.03; P &#x3d; 0.22) with no significant heterogeneity (I<sup>2</sup> &#x3d; 14%, P &#x3d; 0.32) (<xref ref-type="fig" rid="F4">Figure 4b</xref>).</p>
</sec>
<sec id="s3-7">
<title>3.7 Subgroup analysis</title>
<p>To explore the effect of tofacitinib dose on efficacy, we performed a subgroup analysis of ACR20. The results showed that when the dose was &#x3e;5&#xa0;mg twice a day, the ACR20 of tofacitinib was significantly better than that of adalimumab (RR: 1.59; 95% CI: 1.03, 2.48; P &#x3d; 0.04). However, in the subgroup with a dose of &#x2264;5&#xa0;mg twice a day, tofacitinib and adalimumab had similar ACR20 (RR: 1.09; 95% CI: 0.95, 1.26; P &#x3d; 0.22) (<xref ref-type="fig" rid="F5">Figure 5</xref>).</p>
<fig id="F5" position="float">
<label>FIGURE 5</label>
<caption>
<p>Subgroup analysis of ACR20 based on the dose of tofacitinib.</p>
</caption>
<graphic xlink:href="fphar-16-1524214-g005.tif"/>
</fig>
</sec>
<sec id="s3-8">
<title>3.8 Sensitivity analysis</title>
<p>Sensitivity analyses were conducted for ACR20, VAS, DAS28-CRP, HAQ-DI, and adverse events to evaluate the effect of each study on overall outcomes by sequentially excluding eligible studies. The analyses showed stable outcomes after excluding each study for adverse events (<xref ref-type="fig" rid="F6">Figure 6a</xref>), HAQ-DI (<xref ref-type="fig" rid="F6">Figure 6b</xref>), and ACR20 (<xref ref-type="fig" rid="F6">Figure 6c</xref>). However, significant instability was found for VAS (<xref ref-type="fig" rid="F6">Figure 6d</xref>) and DAS28-CRP (<xref ref-type="fig" rid="F6">Figure 6e</xref>). For HAQ-DI, excluding Fleischmann 2012e reduced heterogeneity from 69% to 47%, indicating that this study contributed to the significant heterogeneity. Heterogeneity in other outcomes was not linked to a specific study.</p>
<fig id="F6" position="float">
<label>FIGURE 6</label>
<caption>
<p>Sensitivity analysis of <bold>(a)</bold> adverse events, <bold>(b)</bold> change in HAQ-DI, <bold>(c)</bold> ACR20, <bold>(d)</bold> change in VAS, <bold>(e)</bold> change in DAS28-CRP.</p>
</caption>
<graphic xlink:href="fphar-16-1524214-g006.tif"/>
</fig>
</sec>
</sec>
<sec sec-type="discussion" id="s4">
<title>4 Discussion</title>
<p>Current treatments for RA primarily consist of drug therapies, including NSAIDs, csDMARDs, tsDMARDs, bDMARDs, and glucocorticoids. TNF-&#x3b1; is a key inflammatory factor in RA pathogenesis, regulating osteoclast production and inhibiting osteoblast differentiation, which disrupts the balance between osteoclasts and osteoblasts, leading to bone and joint damage (<xref ref-type="bibr" rid="B4">Bertolini et al., 1986</xref>). Research indicates that patients with high TNF-&#x3b1; expression have a significantly higher risk of erosive arthritis (<xref ref-type="bibr" rid="B21">Laverdi&#xe8;re et al., 2015</xref>). Adalimumab is the first fully humanized monoclonal antibody that specifically targets TNF-&#x3b1;. Tofacitinib, a first-generation oral drug, selectively inhibits JAK1 and JAK3, with minimal effect on JAK2 and TYK2 (<xref ref-type="bibr" rid="B7">Clark et al., 2014</xref>). Studies show that tofacitinib is effective as monotherapy or in combination with DMARDs for RA (<xref ref-type="bibr" rid="B6">Chang and Wang, 2024</xref>).</p>
<p>Nine studies were included in this meta-analysis. Results showed that tofacitinib significantly outperformed adalimumab in ACR20, HAQ-DI, and VAS improvements. No significant difference was observed in adverse events or DAS28-CRP improvements between the two groups. ACR20 was the primary efficacy indicator in this analysis. Van Vollenhoven et al. (<xref ref-type="bibr" rid="B32">van Vollenhoven et al., 2012</xref>) found that at month 6, similar proportions of patients on tofacitinib and adalimumab achieved ACR20, both exceeding placebo. However, this meta-analysis found significantly higher ACR20 in the tofacitinib group than in the adalimumab group. This discrepancy was largely due to the inclusion of Fleischmann et al.&#x27;s (<xref ref-type="bibr" rid="B12">Fleischmann et al., 2012</xref>) dose-response study. At doses of &#x2265;5&#xa0;mg (twice daily), tofacitinib&#x2019;s efficacy was significantly superior to adalimumab 40&#xa0;mg (once every 2&#xa0;weeks). <xref ref-type="bibr" rid="B32">van Vollenhoven et al. (2012)</xref> also observed a trend suggesting tofacitinib&#x2019;s superiority over adalimumab in ACR20, though this was not statistically significant. Thus, we believe that when the tofacitinib dose exceeds 5&#xa0;mg (twice daily), its ACR20 is significantly higher than that of the conventional adalimumab dose. However, the long-term efficacy of both drugs in treating rheumatoid arthritis requires further investigation in future clinical studies with extended follow-up durations and additional time points.</p>
<p>Although ACR20 is a commonly used indicator in RA clinical trials, its sensitivity to functional improvement is limited. In addition, the ACR20 standard currently only applies to the US FDA regulatory system and has not been adopted by agencies such as MHRA and EMA. This study also included patient-reported outcomes such as HAQ-DI to more comprehensively evaluate the impact of treatment on quality of life. Joint pain, swelling, and functional limitation are key clinical manifestations of RA (<xref ref-type="bibr" rid="B26">Skyrme et al., 2024</xref>; <xref ref-type="bibr" rid="B22">Looijen et al., 2024</xref>; <xref ref-type="bibr" rid="B15">Frazzei et al., 2024</xref>). This study found tofacitinib significantly superior to adalimumab in improving pain scores. However, <xref ref-type="bibr" rid="B29">Strand et al. (2019)</xref> did not observe a significant advantage of tofacitinib in improving VAS, possibly due to sample size limitations. In assessing quality of life, this meta-analysis found tofacitinib significantly superior to adalimumab in improving HAQ-DI. However, <xref ref-type="bibr" rid="B30">Strand et al. (2016)</xref> reported similar HAQ-DI improvements in both treatment groups at all time points, differing from the results of this study. Differences in race, disease course, and body mass index may explain varying patient responses to treatment. Additionally, no significant difference was observed between tofacitinib and adalimumab in improving DAS28-CRP, suggesting similar effects in reducing RA activity and delaying bone destruction. Tofacitinib&#x2019;s primary advantage lies in improving quality of life and symptom relief. The long-term prognostic differences between these two drugs in rheumatoid arthritis treatment require further study.</p>
<p>This study found comparable incidence rates of adverse events between the two groups in the safety evaluation. The safety of these two drugs remains controversial in current reports. While some studies align with this article (<xref ref-type="bibr" rid="B13">Fleischmann et al., 2017</xref>), <xref ref-type="bibr" rid="B32">van Vollenhoven et al. (2012)</xref> reported a higher probability of serious adverse events with tofacitinib than adalimumab within the first 3 months of treatment. Given the sample size limitations, further research is needed to confirm this finding.</p>
<p>This meta-analysis has several limitations. First, the study included a small number of retrospective cohort studies, inherent in clinical research. A major limitation of retrospective studies is the potential for confounding factors and bias. In addition, not all included studies were international multicenter studies. Some studies only included populations from a single country or region, resulting in a certain degree of selective bias. Besides, due to insufficient data, we were unable to analyze the differences between tofacitinib and adalimumab in important clinical indicators such as ACR50, which needs to be confirmed by further studies. In addition, merging different types of studies may produce &#x201c;mixed effects&#x201d; that are difficult to explain. For example, the effect size of RCTs is based on strictly controlled intervention conditions, while the effect size of cohort studies is easily interfered by real-world confounding factors (such as lifestyle and comorbidities). The combined results of the two may not be pure causal effects or true exposure associations. At the same time, the non-compressibility of OR values &#x200b;&#x200b;may cause the combined effect to deviate from the true value. Furthermore, if the patient stops treatment prematurely, the results at the last follow-up may not reflect the sustained treatment effect, which may affect the overall efficacy analysis of the drug to some extent. Finally, due to insufficient data, the economic costs of tofacitinib and adalimumab could not be analyzed, requiring further investigation. Due to the limited number of studies, detailed subgroup and dose-response analyses could not be performed, leaving the effects of factors such as population, intervention duration, follow-up time, and drug dose unconfirmed. Although significant heterogeneity was present in this meta-analysis, sensitivity analysis did not fully identify its source, warranting caution when interpreting the results. Despite these limitations, this is the latest meta-analysis comparing the efficacy and safety of tofacitinib and adalimumab. The findings provide clinicians with the most up-to-date, comprehensive evidence-based reference for selecting treatments, aiming to identify options with rapid onset, strong efficacy, safety, and affordability for RA patients.</p>
</sec>
<sec sec-type="conclusion" id="s5">
<title>5 Conclusion</title>
<p>This meta-analysis found tofacitinib significantly superior to adalimumab in improving ACR20, VAS, and HAQ-DI, with no significant difference in adverse event rates or DAS28-CRP improvement between the two. Given the limitations of ACR20, clinical decision making needs to comprehensively consider patient-reported outcomes, long-term safety, and individualized treatment goals. Given the potential heterogeneity, small sample size, and lack of subgroup analysis, larger multicenter prospective studies are needed to confirm the advantages and disadvantages of tofacitinib and adalimumab in RA treatment.</p>
</sec>
</body>
<back>
<sec sec-type="data-availability" id="s6">
<title>Data availability statement</title>
<p>The original contributions presented in the study are included in the article/<xref ref-type="sec" rid="s12">Supplementary Material</xref>, further inquiries can be directed to the corresponding author.</p>
</sec>
<sec sec-type="author-contributions" id="s7">
<title>Author contributions</title>
<p>CZ: Conceptualization, Data curation, Formal Analysis, Methodology, Writing &#x2013; original draft, Writing &#x2013; review and editing. YZ: Software, Supervision, Validation, Writing &#x2013; original draft. ZW: Investigation, Resources, Visualization, Writing &#x2013; original draft. GC: Data curation, Formal Analysis, Supervision, Writing &#x2013; original draft. YL: Conceptualization, Data curation, Formal Analysis, Methodology, Writing &#x2013; original draft, Writing &#x2013; review and editing.</p>
</sec>
<sec sec-type="funding-information" id="s8">
<title>Funding</title>
<p>The author(s) declare that no financial support was received for the research and/or publication of this article.</p>
</sec>
<sec sec-type="COI-statement" id="s9">
<title>Conflict of interest</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec sec-type="ai-statement" id="s10">
<title>Generative AI statement</title>
<p>The author(s) declare that no Generative AI was used in the creation of this manuscript.</p>
</sec>
<sec sec-type="disclaimer" id="s11">
<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>
<sec sec-type="supplementary-material" id="s12">
<title>Supplementary material</title>
<p>The Supplementary Material for this article can be found online at: <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fphar.2025.1524214/full#supplementary-material">https://www.frontiersin.org/articles/10.3389/fphar.2025.1524214/full&#x23;supplementary-material</ext-link>
</p>
<supplementary-material xlink:href="DataSheet1.docx" id="SM1" mimetype="application/docx" xmlns:xlink="http://www.w3.org/1999/xlink"/>
</sec>
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