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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>
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<article-meta>
<article-id pub-id-type="publisher-id">1608339</article-id>
<article-id pub-id-type="doi">10.3389/fphar.2025.1608339</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Pharmacology</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Efficacy and safety of darolutamide <italic>versus</italic> abiraterone acetate plus prednisone in combination with ADT for mHSPC: a real-world clinical retrospective study</article-title>
<alt-title alt-title-type="left-running-head">Hu 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.2025.1608339">10.3389/fphar.2025.1608339</ext-link>
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<contrib-group>
<contrib contrib-type="author" equal-contrib="yes">
<name>
<surname>Hu</surname>
<given-names>Ting</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
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<xref ref-type="aff" rid="aff2">
<sup>2</sup>
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<sup>&#x2020;</sup>
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<name>
<surname>Zhou</surname>
<given-names>Fang</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
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<xref ref-type="author-notes" rid="fn001">
<sup>&#x2020;</sup>
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<name>
<surname>Zheng</surname>
<given-names>Yang</given-names>
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<xref ref-type="aff" rid="aff1">
<sup>1</sup>
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<xref ref-type="aff" rid="aff2">
<sup>2</sup>
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<sup>&#x2020;</sup>
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<name>
<surname>Luo</surname>
<given-names>Bohan</given-names>
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<xref ref-type="aff" rid="aff1">
<sup>1</sup>
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<xref ref-type="aff" rid="aff3">
<sup>3</sup>
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<sup>&#x2020;</sup>
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<contrib contrib-type="author">
<name>
<surname>Zhang</surname>
<given-names>Yongliang</given-names>
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<xref ref-type="aff" rid="aff4">
<sup>4</sup>
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<contrib contrib-type="author">
<name>
<surname>Gu</surname>
<given-names>Chengpeng</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
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<xref ref-type="aff" rid="aff5">
<sup>5</sup>
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<surname>Wang</surname>
<given-names>Guopeng</given-names>
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<xref ref-type="aff" rid="aff1">
<sup>1</sup>
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<contrib contrib-type="author">
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<surname>Zhang</surname>
<given-names>Jinze</given-names>
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<sup>1</sup>
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<name>
<surname>Tian</surname>
<given-names>Jingzhi</given-names>
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<xref ref-type="aff" rid="aff2">
<sup>2</sup>
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<contrib contrib-type="author">
<name>
<surname>Nie</surname>
<given-names>Yu</given-names>
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<xref ref-type="aff" rid="aff2">
<sup>2</sup>
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<contrib contrib-type="author">
<name>
<surname>Feng</surname>
<given-names>Yunlin</given-names>
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<sup>6</sup>
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<contrib contrib-type="author" corresp="yes">
<name>
<surname>Ren</surname>
<given-names>Shangqing</given-names>
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<xref ref-type="aff" rid="aff2">
<sup>2</sup>
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<contrib contrib-type="author" corresp="yes">
<name>
<surname>Di</surname>
<given-names>Wenjia</given-names>
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<xref ref-type="aff" rid="aff3">
<sup>3</sup>
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<contrib contrib-type="author" corresp="yes">
<name>
<surname>Wang</surname>
<given-names>Dong</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
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<aff id="aff1">
<sup>1</sup>
<institution>School of Medicine</institution>, <institution>University of Electronic Science and Technology of China</institution>, <addr-line>Chengdu</addr-line>, <country>China</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Robotic Minimally Invasive Surgery Center</institution>, <institution>Sichuan Provincial People&#x2019;s Hospital</institution>, <institution>School of Medicine</institution>, <institution>University of Electronic Science and Technology of China</institution>, <addr-line>Chengdu</addr-line>, <country>China</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Organ Transplantation Center</institution>, <institution>Sichuan Provincial People&#x2019;s Hospital</institution>, <institution>School of Medicine</institution>, <institution>University of Electronic Science and Technology of China</institution>, <addr-line>Chengdu</addr-line>, <country>China</country>
</aff>
<aff id="aff4">
<sup>4</sup>
<institution>Department of Information</institution>, <institution>Sichuan Provincial People&#x2019;s Hospital</institution>, <institution>School of Medicine</institution>, <institution>University of Electronic Science and Technology of China</institution>, <addr-line>Chengdu</addr-line>, <country>China</country>
</aff>
<aff id="aff5">
<sup>5</sup>
<institution>Clinical Medical College, Southwest Medical University</institution>, <addr-line>Luzhou</addr-line>, <country>China</country>
</aff>
<aff id="aff6">
<sup>6</sup>
<institution>Department of Nephrology</institution>, <institution>Sichuan Provincial People&#x2019;s Hospital</institution>, <institution>School of Medicine</institution>, <institution>University of Electronic Science and Technology of China</institution>, <addr-line>Chengdu</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/30039/overview">Nor Eddine Sounni</ext-link>, University of Li&#xe8;ge, Belgium</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/3042649/overview">Tatsuya Shimomura</ext-link>, Jikei University School of Medicine, Japan</p>
<p>
<ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/3061933/overview">Charles Pottier</ext-link>, University Hospital of Li&#xe8;ge, Belgium</p>
</fn>
<corresp id="c001">&#x2a;Correspondence: Dong Wang, <email>wangdong19690530@163.com</email>; Wenjia Di, <email>diwenjia@uestc.edu.cn</email>; Shangqing Ren, <email>rsq0516@163.com</email>
</corresp>
<fn fn-type="equal" id="fn001">
<label>
<sup>&#x2020;</sup>
</label>
<p>These authors have contributed equally to this work and share first authorship</p>
</fn>
</author-notes>
<pub-date pub-type="epub">
<day>19</day>
<month>06</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="collection">
<year>2025</year>
</pub-date>
<volume>16</volume>
<elocation-id>1608339</elocation-id>
<history>
<date date-type="received">
<day>08</day>
<month>04</month>
<year>2025</year>
</date>
<date date-type="accepted">
<day>05</day>
<month>06</month>
<year>2025</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2025 Hu, Zhou, Zheng, Luo, Zhang, Gu, Wang, Zhang, Tian, Nie, Feng, Ren, Di and Wang.</copyright-statement>
<copyright-year>2025</copyright-year>
<copyright-holder>Hu, Zhou, Zheng, Luo, Zhang, Gu, Wang, Zhang, Tian, Nie, Feng, Ren, Di and Wang</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>Introduction</title>
<p>Effective treatment during the metastatic hormone-sensitive prostate cancer (mHSPC) stage is crucial for delaying disease progression. Due to the lack of a head-to-head comparison of darolutamide (DARO) and abiraterone acetate plus prednisone (AAP) doublet regimen, this study aims to compare the efficacy and safety of DARO &#x2b; ADT and AAP &#x2b; ADT in the treatment of mHSPC in the real world.</p>
</sec>
<sec>
<title>Methods</title>
<p>This study retrospectively analyzed patients with mHSPC who received DARO or AAP treatment in Sichuan Provincial People&#x2019;s Hospital from January 2022 to June 2024, with follow-up until December 2024. The clinical data and prostate-specific antigen (PSA) changes of patients were collected. The primary endpoint was time to metastatic castration-resistant prostate cancer (mCRPC), and the secondary endpoints were overall survival (OS), radiological progression-free survival (rPFS), time to PSA progression, time to pain progression, and time to subsequent prostate cancer therapy.</p>
</sec>
<sec>
<title>Results</title>
<p>A total of 178 patients were included, with 96 in the DARO group and 82 in the AAP group. The baseline characteristics of the two groups were comparable. The median follow-up time and interquartile ranges of the DARO and AAP groups were 12.0 [7.9&#x2013;17.6] months and 17.4 [9.3&#x2013;23.8] months, respectively. For the primary endpoint, DARO significantly delayed the time to mCRPC <italic>versus</italic> AAP [HR, 0.41 (95%CI, 0.23 to 0.71); <italic>P</italic> &#x3c; 0.005]. And the DARO group significantly benefited in all secondary endpoints. DARO significantly led to deeper PSA reduction compared to AAP, with higher median reduction rates, better PSA50 and PSA90 remission rates, and a higher proportion of patients reaching lower PSA values. The incidence of adverse reactions was similar in the two groups, and there was no grade 3 or above drug-related adverse reactions.</p>
</sec>
<sec>
<title>Conclusion</title>
<p>In the treatment of mHSPC, DARO &#x2b; ADT was associated with significant improvement of clinical outcomes <italic>versus</italic> AAP &#x2b; ADT, while their safety is comparable.</p>
</sec>
</abstract>
<kwd-group>
<kwd>metastatic hormone-sensitive prostate cancer</kwd>
<kwd>darolutamide</kwd>
<kwd>abiraterone acetate</kwd>
<kwd>androgen deprivation therapy</kwd>
<kwd>efficacy</kwd>
<kwd>safety</kwd>
</kwd-group>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Pharmacology of Anti-Cancer Drugs</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1">
<title>1 Introduction</title>
<p>Prostate cancer (Pca) is a malignant tumor originating from the epithelial cells of the prostate gland (<xref ref-type="bibr" rid="B24">Rebello et al., 2021</xref>). Global cancer statistics indicate that prostate cancer is the second most common cancer in men and the fifth leading cause of cancer-related deaths among males (<xref ref-type="bibr" rid="B31">Smith et al., 2023</xref>). Metastatic hormone-sensitive prostate cancer (mHSPC) represents a critical stage, where timely and effective treatment can potentially delay disease progression to metastatic castration-resistant prostate cancer (mCRPC) and improve overall prognosis (<xref ref-type="bibr" rid="B3">Castellan et al., 2018</xref>; <xref ref-type="bibr" rid="B4">Chi et al., 2019</xref>; <xref ref-type="bibr" rid="B2">Armstrong et al., 2019</xref>).</p>
<p>Androgen deprivation therapy (ADT) has long been the cornerstone of treatment for mHSPC (<xref ref-type="bibr" rid="B42">Yu and Aragon-Ching, 2022</xref>). However, traditional approaches such as ADT alone or ADT combined with first-generation antiandrogens like bicalutamide have proven insufficient to significantly improve survival or quality of life in mHSPC patients (<xref ref-type="bibr" rid="B35">Ueda et al., 2024</xref>; <xref ref-type="bibr" rid="B41">Wenzel et al., 2023</xref>). Moreover, nearly all advanced prostate cancer patients eventually develop resistance to ADT and first-generation androgen receptor antagonists, leading to progression to mCRPC (<xref ref-type="bibr" rid="B37">Wang et al., 2023</xref>; <xref ref-type="bibr" rid="B38">Watson et al., 2015</xref>).</p>
<p>The treatment landscape for mHSPC has undergone significant transformation, with the introduction of novel therapies such as ADT &#x2b; docetaxel or second-generation antiandrogens demonstrating substantial improvements in survival outcomes (<xref ref-type="bibr" rid="B17">Lam et al., 2024</xref>; <xref ref-type="bibr" rid="B12">Hamilou et al., 2018</xref>; <xref ref-type="bibr" rid="B16">Kyriakopoulos et al., 2018</xref>). The LATITUDE trial was the first to validate the efficacy of the abiraterone acetate plus prednisone (AAP) &#x2b; ADT doublet regimen (<xref ref-type="bibr" rid="B8">Fizazi et al., 2019a</xref>). Studies have shown that this combination leads to a decline in prostate-specific antigen (PSA) levels (<xref ref-type="bibr" rid="B26">Sadaghiani et al., 2022</xref>), with the extent of PSA reduction serving as a key early indicator of long-term prognosis (<xref ref-type="bibr" rid="B27">Sadaghiani et al., 2021</xref>; <xref ref-type="bibr" rid="B5">Chowdhury et al., 2023</xref>). The emergence of the PEACE-1 trial further demonstrated that the triplet regimen of AAP &#x2b; ADT &#x2b; docetaxel improves both overall survival (OS) and radiographic progression-free survival (rPFS) in mHSPC patients (<xref ref-type="bibr" rid="B6">Fizazi et al., 2022</xref>), establishing this triplet regimen as a standard treatment. With the continuous development of second-generation antiandrogens, darolutamide (DARO) has gained attention. The ARASENS trial highlighted the significant OS benefits of the DARO &#x2b; ADT &#x2b; docetaxel triplet regimen (<xref ref-type="bibr" rid="B32">Smith et al., 2022</xref>). More recently, the ARANOTE study confirmed the safety and efficacy of the DARO &#x2b; ADT doublet regimen (<xref ref-type="bibr" rid="B25">Sa et al., 2024</xref>), ushering in a new era of dual therapy for mHSPC.</p>
<p>Both DARO and AAP triplet regimen are associated with significantly increased adverse event rates and higher treatment costs (<xref ref-type="bibr" rid="B18">Lee, 2023</xref>; <xref ref-type="bibr" rid="B13">Hoeh et al., 2023</xref>; <xref ref-type="bibr" rid="B30">Shore et al., 2022</xref>). In real-world settings, patients often exhibit reluctance toward chemotherapy due to its side effects, influencing their treatment choices (<xref ref-type="bibr" rid="B15">Jansen et al., 2022</xref>; <xref ref-type="bibr" rid="B1">Aparicio et al., 2021</xref>). Concerns regarding drug accessibility, tolerability, safety, drug-drug interactions, and health economics have led many mHSPC patients to opt for doublet regimen only (<xref ref-type="bibr" rid="B19">Leith et al., 2022</xref>; <xref ref-type="bibr" rid="B9">Freedland et al., 2021</xref>; <xref ref-type="bibr" rid="B23">Raval et al., 2024</xref>; <xref ref-type="bibr" rid="B29">Schiff, 2022</xref>).</p>
<p>Although the efficacy of the doublet and triplet regimen of DARO and AAP has been studied in a controlled environment, real - world data can more comprehensively demonstrate their performance in clinical applications. Patients are resistant to chemotherapy drugs and intolerant to side effects. Meanwhile, there is a lack of head - to - head comparisons of the efficacy and safety of the DARO and AAP doublet regimen in the real world. This study focuses on the real - world setting and compares the efficacy and safety of the DARO &#x2b; ADT and AAP &#x2b; ADT doublet regimen for the treatment of mHSPC, with the time to mCRPC as the primary endpoint. The aim is to provide evidence for the clinical application of the DARO &#x2b; ADT doublet regimen, strive to improve the efficacy and safety, and reduce the economic burden on patients.</p>
</sec>
<sec sec-type="methods" id="s2">
<title>2 Methods</title>
<sec id="s2-1">
<title>2.1 Patients and treatment</title>
<p>This study retrospectively evaluated the efficacy and safety of DARO &#x2b; ADT <italic>versus</italic> AAP &#x2b; ADT in the treatment of mHSPC patients in the real world. The clinical data of mHSPC patients who were treated with DARO &#x2b; ADT or AAP &#x2b; ADT and visited Sichuan Provincial People&#x2019;s Hospital from January 2022 to June 2024 were retrospectively analyzed, and the follow-up lasted until December 2024. In the treatment regimens, the dose of DARO was 600&#xa0;mg administered orally twice daily in combination with ADT in the DARO &#x2b; ADT regimen. In contrast, the dose of abiraterone acetate was 1,000&#xa0;mg administered orally once daily, and the dose of prednisone was 5&#xa0;mg administered orally twice daily in the AAP &#x2b; ADT regimen.</p>
<p>The inclusion criteria for patients were as follows: &#x2460; Pathologically or cytologically confirmed prostate adenocarcinoma; &#x2461; Performance status score of 0&#x2013;1 according to the Eastern Cooperative Oncology Group (ECOG); &#x2462; Received DARO &#x2b; ADT or AAP &#x2b; ADT treatment for at least 1 month and had relatively complete follow-up data; &#x2463; Testosterone was at the castration level during the treatment process (testosterone &#x3c;50&#xa0;ng/mL or &#x3c;1.7&#xa0;nmol/L). The exclusion criteria were: &#x2460; Received docetaxel treatment previously or during the follow-up; &#x2461; Had severe underlying diseases that were poorly controlled; &#x2462; Received palliative radiotherapy, palliative surgery or particle implantation simultaneously; &#x2463; Had a history of other primary malignancies, except for patients with <italic>in situ</italic> carcinoma who had no evidence of disease for 5 years or more and did not require treatment.</p>
</sec>
<sec id="s2-2">
<title>2.2 Follow-up observation data and endpoints</title>
<p>We collected the clinical data of patients from the hospital information electronic medical record system (HIS), including: age, Gleason score of the puncture pathology, ECOG score, baseline testosterone, PSA levels (before treatment, 1&#xa0;month, 3&#xa0;months, 6&#xa0;months, 9&#xa0;months, 12&#xa0;months after treatment; time to reach PSA50 (defined as the proportion of patients with a 50% decrease in PSA from the baseline value after treatment), PSA90 (defined as the proportion of patients with a 90% decrease in PSA from the baseline value after treatment), PSA &#x3c;2&#xa0;ng/mL, PSA &#x3c;0.02&#xa0;ng/mL, and PSA &#x3c;0.008); previous treatment history and drug-related adverse events (AE).</p>
<p>The primary endpoint was the time to mCRPC, and the secondary endpoints included OS, rPFS, time to PSA progression, time to subsequent prostate cancer therapy.</p>
</sec>
<sec id="s2-3">
<title>2.3 Data analysis</title>
<p>SPSS 26.0 software was used to conduct statistical analysis of the relevant data. The Kolmogorov-Smirnov method was used to test the normality of the measurement data. The measurement data with non-normal distribution were represented by M (P25, P75) and analyzed by the Mann-Whitney U test. The count data were represented by the number of cases (%) and analyzed by the &#x3c7;<sup>2</sup> test or Fisher&#x2019;s exact probability method. The Kaplan-Meier estimation and COX regression model were used to analyze the primary and secondary endpoints. A <italic>P</italic> value less than 0.05 indicated that the difference was statistically significant.</p>
</sec>
</sec>
<sec sec-type="results" id="s3">
<title>3 Results</title>
<sec id="s3-1">
<title>3.1 Baseline data</title>
<p>A total of 308 patients were included in the study, and 178 of them met the inclusion criteria. Among them, 96 patients used DARO and 82 patients used AAP. None of the included patients had received docetaxel chemotherapy. The demographic and baseline characteristics of the patients were well balanced between the two groups (<italic>P</italic> &#x3e; 0.05) (<xref ref-type="table" rid="T1">Table 1</xref>). The age distribution was consistent in both groups. The median age in the DARO group was 74&#xa0;years (53&#x2013;96&#xa0;years), and the median age in the AAP group was 75&#xa0;years (48&#x2013;75&#xa0;years). In the DARO group, 75 patients (78.1%) had a Gleason score of &#x2265;8; in the AAP group, 67 patients (81.7%) had a Gleason score of &#x2265;8. In terms of the ECOG score, 61 patients (63.5%) in the DARO group had an ECOG score of 0, and 54 patients (65.9%) in the AAP group had an ECOG score of 0; 35 patients (36.5%) in the DARO group had an ECOG score of 1, and 28 patients (34.1%) in the AAP group had an ECOG score of 1.</p>
<table-wrap id="T1" position="float">
<label>TABLE 1</label>
<caption>
<p>Baseline data on 178 patients.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="left">Characteristics</th>
<th align="left">DARO values</th>
<th align="left">AAP values</th>
<th align="left">
<italic>P</italic> Value</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left">Age (years), median [range]</td>
<td align="left">74 [53&#x2013;96]</td>
<td align="left">75 [48&#x2013;95]</td>
<td align="left">0.307</td>
</tr>
<tr>
<td align="left">&#x3c;70, n (%)</td>
<td align="left">25 (26.0)</td>
<td align="left">21 (25.6)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">&#x2265;70, n (%)</td>
<td align="left">71 (74.0)</td>
<td align="left">61 (74.4)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">Gleason score, median [IQR]</td>
<td align="left">8 [8&#x2013;9]</td>
<td align="left">8 [8&#x2013;9]</td>
<td align="left">0.06</td>
</tr>
<tr>
<td align="left">&#x2265;8, n (%)</td>
<td align="left">75 (78.1)</td>
<td align="left">67 (81.7)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">&#x3c;8, n (%)</td>
<td align="left">21 (21.9)</td>
<td align="left">15 (18.3)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">ECOG, median [range]</td>
<td align="left">0 [0&#x2013;1]</td>
<td align="left">0 [0&#x2013;1]</td>
<td align="left">0.748</td>
</tr>
<tr>
<td align="left">0, n (%)</td>
<td align="left">61 (63.5)</td>
<td align="left">54 (65.9)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">1, n (%)</td>
<td align="left">35 (36.5)</td>
<td align="left">28 (34.1)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">Prior treatment, n (%)</td>
<td align="left">50 (52.1)</td>
<td align="left">45 (54.9)</td>
<td align="left">0.709</td>
</tr>
<tr>
<td colspan="4" align="left">Prior treatment regimen</td>
</tr>
<tr>
<td align="left">ADT alone, n/N (%)</td>
<td align="left">13/50 (26.0)</td>
<td align="left">10/45 (22.2)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">ADT &#x2b; BICA, n/N (%)</td>
<td align="left">35/50 (70.0)</td>
<td align="left">35/45 (77.8)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">ADT &#x2b; AA, n/N (%)</td>
<td align="left">2/50 (4.0)</td>
<td align="left"/>
<td align="left"/>
</tr>
<tr>
<td align="left">Baseline PSA (ng/mL), median [IQR]</td>
<td align="left">22.97 [7.44&#x2013;87.17]</td>
<td align="left">22.91 [5.45&#x2013;66.67]</td>
<td align="left">0.442</td>
</tr>
<tr>
<td align="left">&#x2265;20, n (%)</td>
<td align="left">52 (54.2)</td>
<td align="left">44 (53.7)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">&#x2265;100, n (%)</td>
<td align="left">21 (21.9)</td>
<td align="left">8 (9.8)</td>
<td align="left"/>
</tr>
<tr>
<td align="left">Testosterone (ng/mL), median [IQR]</td>
<td align="left">0.39 [0.09&#x2013;9.49]</td>
<td align="left">0.45 [0.09&#x2013;0.91]</td>
<td align="left">0.489</td>
</tr>
<tr>
<td align="left">Comorbidities, n (%)</td>
<td align="left">39 (40.6)</td>
<td align="left">27 (32.9)</td>
<td align="left">0.289</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>DARO, darolutamide; AAP, abiraterone acetate plus prednisone; IQR, interquartile range; ECOG, eastern cooperative oncology group; ADT, androgen deprivation therapy; BICA, bicalutamide; AA, abiraterone acetate; PSA, prostate-specific antigen.</p>
</fn>
</table-wrap-foot>
</table-wrap>
<p>Among all 96 patients who received DARO, 50 patients (52.1%) had a history of previous treatment, and 46 patients (47.9%) received DARO as the first-line treatment. Among 82 patients who received AA, 45 patients (54.9%) had a history of previous treatment, and 37 patients (45.1%) received AA as the first-line treatment.</p>
</sec>
<sec id="s3-2">
<title>3.2 Primary end point</title>
<p>The primary endpoint of this study was the time to mCRPC. The analysis of time to mCRPC demonstrated that the proportion of patients progressing in the DARO group (18/92; 18.8%) was significantly lower than that in the AAP group (39/82; 47.6%). DARO significantly extended the time to progression to mCRPC, with a 59% reduction in the risk of progression to mCRPC compared to the AAP group [HR, 0.41 (95% CI, 0.23 to 0.71); <italic>P &#x3c;</italic> 0.005] (<xref ref-type="table" rid="T2">Table 2</xref>; <xref ref-type="fig" rid="F1">Figure 1</xref>). The median time to progression was not reached in the DARO group, whereas it was 17.3&#xa0;months in the AAP group.</p>
<table-wrap id="T2" position="float">
<label>TABLE 2</label>
<caption>
<p>Time to event end points.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th rowspan="2" align="center">End points</th>
<th colspan="2" align="center">DARO &#x2b; ADT (n &#x3d; 96)</th>
<th colspan="2" align="center">AAP &#x2b; ADT (n &#x3d; 82)</th>
<th rowspan="2" align="center">Hazard Ratio (95% CI)</th>
<th rowspan="2" align="center">
<italic>P</italic> value</th>
</tr>
<tr>
<th align="center">Median, months</th>
<th align="center">Events, (%)</th>
<th align="center">Median, months</th>
<th align="center">Events, (%)</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left">Time to mCRPC</td>
<td align="center">NR</td>
<td align="center">18 (18.8)</td>
<td align="center">17.3</td>
<td align="center">39 (47.6)</td>
<td align="center">0.41 (0.23,0.71)</td>
<td align="center">0.002</td>
</tr>
<tr>
<td align="left">Time to PSA progression</td>
<td align="center">NR</td>
<td align="center">15 (15.6)</td>
<td align="center">22.3</td>
<td align="center">34 (41.5)</td>
<td align="center">0.42 (0.23,0.78)</td>
<td align="center">0.006</td>
</tr>
<tr>
<td align="left">OS</td>
<td align="center">NR</td>
<td align="center">4 (4.2)</td>
<td align="center">NR</td>
<td align="center">18 (22.0)</td>
<td align="center">0.31 (0.10,0.93)</td>
<td align="center">0.037</td>
</tr>
<tr>
<td align="left">rPFS</td>
<td align="center">NR</td>
<td align="center">6 (6.3)</td>
<td align="center">NR</td>
<td align="center">27 (32.9)</td>
<td align="center">0.21 (0.09,0.51)</td>
<td align="center">0.001</td>
</tr>
<tr>
<td align="left">Time to pain progression</td>
<td align="center">NR</td>
<td align="center">7 (7.3)</td>
<td align="center">NR</td>
<td align="center">18 (22.0)</td>
<td align="center">0.37 (0.16,0.90)</td>
<td align="center">0.028</td>
</tr>
<tr>
<td align="left">Time to subsequent prostate cancer therapy</td>
<td align="center">NR</td>
<td align="center">3 (3.1)</td>
<td align="center">NR</td>
<td align="center">14 (17.1)</td>
<td align="center">0.23 (0.07,0.82)</td>
<td align="center">0.023</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>DARO, darolutamide; ADT, androgen-deprivation therapy; AAP, abiraterone acetate plus prednisone; mCRPC, metastatic castration-resistant prostate cancer; PSA, prostate-specific antigen; OS, overall survival; rPFS, radiological progression-free survival; NR, not reached. A hazard ratio and 95% CI, are based on Cox regression model.</p>
</fn>
</table-wrap-foot>
</table-wrap>
<fig id="F1" position="float">
<label>FIGURE 1</label>
<caption>
<p>Time to metastatic castration-prostate cancer Kaplan-Meier estimates.</p>
</caption>
<graphic xlink:href="fphar-16-1608339-g001.tif">
<alt-text content-type="machine-generated">Kaplan-Meier survival plot showing time to metastatic castration-resistant prostate cancer. Two lines represent survival probabilities: red for DARO + ADT and blue for AAP + ADT. DARO + ADT maintains higher event-free probability over time. Hazard ratio is 0.41 with a 95% confidence interval of 0.23 to 0.71, favoring DARO + ADT. Time since therapy is measured in months.</alt-text>
</graphic>
</fig>
</sec>
<sec id="s3-3">
<title>3.3 Secondary efficacy end points</title>
<p>The DARO group had obvious benefits in all secondary endpoints compared with the AAP group. Among the patients who experienced PSA progression during the follow-up, the proportion of patients in the DARO group (15/96; 15.6%) was less than that in the AAP group (34/82; 41.5%). The risk of PSA progression in the DARO group was 58% lower than that in the AAP group [HR, 0.42 (95% CI, 0.23 to 0.78); <italic>P &#x3c;</italic> 0.05]. The median time in the DARO group was not reached, while the median time in the AAP group was 22.3&#xa0;months. The hazard ratios of OS and rPFS in the DARO group were 69% and 79% lower than those in the AAP group respectively [HR, 0.31 (95% CI, 0.10 to 0.93); <italic>P &#x3c;</italic> 0.05 for OS; HR, 0.21 (95% CI, 0.09 to 0.51); <italic>P &#x3c;</italic> 0.005 for rPFS] (<xref ref-type="table" rid="T2">Table 2</xref>; <xref ref-type="fig" rid="F2">Figure 2</xref>). Similarly, compared with the AAP group, the time to pain progression [HR, 0.37 (95% CI, 0.16 to 0.90); <italic>P &#x3c;</italic> 0.05] and the time to subsequent prostate cancer therapy [HR, 0.23 (95% CI, 0.07 to 0.82); <italic>P &#x3c;</italic> 0.05] were both delayed in the DARO group.</p>
<fig id="F2" position="float">
<label>FIGURE 2</label>
<caption>
<p>Additional secondary time-to-event end points. <bold>(A)</bold> Overall Survival and <bold>(B)</bold> Radiologic Progression-Free Survival.</p>
</caption>
<graphic xlink:href="fphar-16-1608339-g002.tif">
<alt-text content-type="machine-generated">Panel A shows a Kaplan-Meier curve for overall survival comparing DARO + ADT and AAP + ADT, with the former group showing higher survival probability over time. The hazard ratio is 0.31 (95% CI, 0.10 to 0.93). Panel B presents a similar curve for radiologic progression-free survival, again favoring DARO + ADT. The hazard ratio is 0.21 (95% CI, 0.09 to 0.51). Both panels illustrate event-free probability over 30 months.</alt-text>
</graphic>
</fig>
</sec>
<sec id="s3-4">
<title>3.4 PSA response rate</title>
<p>This study retrospectively analyzed changes in PSA levels following treatment. Compared to baseline, the median PSA reduction rates in the DARO group at 1, 3, 6, 9, and 12 months were 95.1%, 96.4%, 92.8%, 84.2%, and 61.7%, respectively, while those in the AAP group were 34.7%, 71.2%, 70.5%, 50.0%, and 45.9%, respectively. The median follow-up times [IQR] for the DARO and AAP groups were 12.0 [7.9&#x2013;17.6] months and 17.4 [9.3&#x2013;23.8] months, respectively. The Mann-Whitney U test indicated no significant difference in baseline PSA levels between the two groups (<italic>P</italic> &#x3e; 0.05), confirming comparability.</p>
<p>In the DARO group (n &#x3d; 96), 95, 92, 85, 66, and 51 patients had PSA follow-up data at 1, 3, 6, 9, and 12 months, respectively. The PSA50 response rates were 94.7%, 96.7%, 95.3%, 95.5%, and 94.1%, while the PSA90 response rates were 72.6%, 84.8%, 91.8%, 84.8%, and 78.4%, respectively. In the AAP group (n &#x3d; 82), 81, 77, 71, 60, and 58 patients had PSA follow-up data at the corresponding time points. The PSA50 response rates were 50.6%, 76.6%, 74.6%, 71.7%, and 70.7%, while the PSA90 response rates were 24.7%, 49.4%, 60.6%, 58.3%, and 56.9%, respectively. Pearson&#x2019;s chi-square test revealed that the DARO group had significantly higher PSA50 and PSA90 response rates at all time points compared to the AAP group (<italic>P &#x3c;</italic> 0.05).</p>
<p>Furthermore, the proportions of patients achieving PSA &#x3c;2&#xa0;ng/mL, &#x3c;0.2&#xa0;ng/mL, and &#x3c;0.008&#xa0;ng/mL in the DARO group were 99%, 86.5%, and 74.0%, respectively, compared to 86.6%, 70.7%, and 51.2% in the AAP group. The differences between the two groups were statistically significant (<italic>P &#x3c;</italic> 0.05), with the DARO group demonstrating superior outcomes (<xref ref-type="table" rid="T3">Table 3</xref>).</p>
<table-wrap id="T3" position="float">
<label>TABLE 3</label>
<caption>
<p>Number and proportion of DARO and AAP groups with PSA at the corresponding value.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="center">PSA response</th>
<th align="center">DARO</th>
<th align="center">AAP</th>
<th align="center">Pearson chi-square</th>
<th align="center">
<italic>P</italic> Value</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td colspan="5" align="left">1-month PSA response, n/N (%)</td>
</tr>
<tr>
<td align="left">PSA50</td>
<td align="left">90/95 (94.7)</td>
<td align="left">41/81 (50.6)</td>
<td align="center">44.720</td>
<td align="left">&#x3c;0.001</td>
</tr>
<tr>
<td align="left">PSA90</td>
<td align="left">69/95 (72.6)</td>
<td align="left">20/81 (24.7)</td>
<td align="center">40.199</td>
<td align="left">&#x3c;0.001</td>
</tr>
<tr>
<td colspan="5" align="left">3-month PSA response, n/N (%)</td>
</tr>
<tr>
<td align="left">PSA50</td>
<td align="left">89/92 (96.7)</td>
<td align="left">59/77 (76.6)</td>
<td align="center">15.587</td>
<td align="left">&#x3c;0.001</td>
</tr>
<tr>
<td align="left">PSA90</td>
<td align="left">78/92 (84.8)</td>
<td align="left">38/77 (49.4)</td>
<td align="center">24.447</td>
<td align="left">&#x3c;0.001</td>
</tr>
<tr>
<td colspan="5" align="left">6-month PSA response, n/N (%)</td>
</tr>
<tr>
<td align="left">PSA50</td>
<td align="left">81/85 (95.3)</td>
<td align="left">53/71 (74.6)</td>
<td align="center">13.613</td>
<td align="left">&#x3c;0.001</td>
</tr>
<tr>
<td align="left">PSA90</td>
<td align="left">78/85 (91.8)</td>
<td align="left">43/71 (60.6)</td>
<td align="center">21.642</td>
<td align="left">&#x3c;0.001</td>
</tr>
<tr>
<td colspan="5" align="left">9-month PSA response, n/N (%)</td>
</tr>
<tr>
<td align="left">PSA50</td>
<td align="left">63/66 (95.5)</td>
<td align="left">43/60 (71.7)</td>
<td align="center">13.318</td>
<td align="left">&#x3c;0.001</td>
</tr>
<tr>
<td align="left">PSA90</td>
<td align="left">56/66 (84.8)</td>
<td align="left">35/60 (58.3)</td>
<td align="center">11.014</td>
<td align="left">0.001</td>
</tr>
<tr>
<td colspan="5" align="left">12-month PSA response, n/N (%)</td>
</tr>
<tr>
<td align="left">PSA50</td>
<td align="left">48/51 (94.1)</td>
<td align="left">41/58 (70.7)</td>
<td align="center">9.942</td>
<td align="left">0.002</td>
</tr>
<tr>
<td align="left">PSA90</td>
<td align="left">40/51 (78.4)</td>
<td align="left">33/58 (56.9)</td>
<td align="center">5.690</td>
<td align="left">0.017</td>
</tr>
<tr>
<td align="left">Rate of PSA &#x3c;2&#xa0;ng/mL, n (%)</td>
<td align="left">95 (99.0)</td>
<td align="left">71 (86.6)</td>
<td align="center">10.769</td>
<td align="left">0.001</td>
</tr>
<tr>
<td align="left">Rate of PSA &#x3c;0.2&#xa0;ng/mL, n (%)</td>
<td align="left">83 (86.5)</td>
<td align="left">58 (70.7)</td>
<td align="center">6.643</td>
<td align="left">0.010</td>
</tr>
<tr>
<td align="left">Rate of PSA &#x3c;0.008&#xa0;ng/mL, n (%)</td>
<td align="left">71 (74.0)</td>
<td align="left">42 (51.2)</td>
<td align="center">9.864</td>
<td align="left">0.002</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>DARO, darolutamide; AAP, abiraterone acetate plus prednisone; PSA, prostate-specific antigen; PSA50, prostate-specific antigen reduction by 50% or more; PSA90, prostate-specific antigen reduction by 90% or more.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</sec>
<sec id="s3-5">
<title>3.5 Drug-related adverse reactions</title>
<p>According to the previous medical records of patients in this study, the incidence of adverse reactions during the follow-up was similar between the two groups. In the DARO group, it was 22/96 (22.9%), and in the AAP group, it was 27/82 (32.9%). The adverse reactions with relatively high incidences in the DARO group included gastrointestinal reactions, rash, constipation, and abnormal liver function, etc.; the adverse reactions with relatively high incidences in the AAP group included abnormal liver function, hypertension, fatigue, and gastrointestinal reactions, etc. No drug-related adverse reactions above grade 3 were reported in either group.</p>
</sec>
</sec>
<sec sec-type="discussion" id="s4">
<title>4 Discussion</title>
<p>This study evaluated the efficacy and safety of DARO &#x2b; ADT in patients with mHSPC. In the assessment of the primary endpoint, we compared the time to mCRPC. The results showed that the time to mCRPC in the DARO group was significantly prolonged. This finding indicates that DARO has a favorable effect in delaying disease progression compared to AAP. This contradicts the meta-analysis by Lin Wang et al., who concluded that abiraterone acetate had the lowest risk of metastasis and death (<xref ref-type="bibr" rid="B36">Wang et al., 2022</xref>). However <italic>Rana</italic> McKay concluded that in the real-world, patients receiving DARO have better outcomes (<xref ref-type="bibr" rid="B22">Rana et al., 2025</xref>), which is consistent with this study. In addition, the COX regression analysis between the DARO group and the AAP group also showed a significant difference, suggesting that the DARO doublet regimen has an advantage in reducing the risk of mHSPC progressing to mCRPC. DARO significantly improved OS with consistent safety in phase III trials involving patients with non - metastatic castration resistant prostate cancer (nmCRPC) and mHSPC (in combination with ADT and Docetaxel) (<xref ref-type="bibr" rid="B32">Smith et al., 2022</xref>; <xref ref-type="bibr" rid="B7">Fizazi et al., 2019b</xref>). These findings highlight that in real - world data, the efficacy of the DARO doublet regimen may be superior to that of the AAP doublet regimen.</p>
<p>In the assessment of secondary efficacy endpoints, the comparison of the time to PSA progression is equally important. The study found that the DARO group showed a significant advantage in the time to PSA progression, which may be related to its stronger anti-tumor activity (<xref ref-type="bibr" rid="B33">Sung et al., 2021</xref>). The analysis results of OS and rPFS also support this view, indicating that patients in the DARO group can maintain a progression-free state for a longer time after treatment (<xref ref-type="bibr" rid="B11">Gillessen et al., 2023</xref>). The comparison of the time to pain progression provides a basis for evaluating the safety of treatment, showing that the DARO group has an advantage in reducing bone-related symptoms (<xref ref-type="bibr" rid="B28">Sagaram and Rao, 2021</xref>). The comparison of the time to subsequent prostate cancer therapy reflects the impact of different treatment regimens on patients&#x27; subsequent treatment choices, suggesting that clinicians need to comprehensively consider patients&#x2019; long-term management needs when formulating treatment plans (<xref ref-type="bibr" rid="B39">Wei et al., 2025</xref>).</p>
<p>The results of this study showed that compared with the AAP group, the PSA level in the DARO group was significantly reduced. In the comparison of PSA response rates, we observed changes in PSA levels at different time points, especially the differences between the DARO group and the AAP group. This finding is consistent with previous research results, indicating that DARO treatment may significantly reduce PSA levels in the early stage (<xref ref-type="bibr" rid="B14">Jafari et al., 2024</xref>; <xref ref-type="bibr" rid="B34">Tombal et al., 2022</xref>). At the same time, the comparison of PSA50 and PSA90 remission rates showed that the remission rates in the DARO group were significantly higher than those in the AAP group, which further supports the potential advantages of DARO in treatment. For the achievement of PSA &#x3c;2&#xa0;ng/mL, &#x3c;0.02&#xa0;ng/mL, and &#x3c;0.008&#xa0;ng/mL, our statistical analysis results also showed significant differences. These results are consistent with previous studies that emphasized the importance of early PSA reduction in improving the prognosis and survival rate of mHSPC patients (<xref ref-type="bibr" rid="B20">Liu et al., 2024</xref>; <xref ref-type="bibr" rid="B21">Myint et al., 2022</xref>; <xref ref-type="bibr" rid="B40">Wenzel et al., 2024</xref>), and also indicate that the DARO doublet regimen is more effective than AAP in reducing PSA levels and can provide a new treatment option for clinical practice.</p>
<p>This study aims to compare the efficacy of DARO &#x2b; ADT <italic>versus</italic> AAP &#x2b; ADT in the treatment of mHSPC in a real-world setting, addressing a significant gap in clinical evidence. The results demonstrated that the DARO group significantly outperformed the AAP group in both primary and secondary endpoints, including PSA changes and time to mCRPC (<italic>P</italic> &#x3c; 0.05), highlighting the beneficial role of the DARO &#x2b; ADT combination in mHSPC management, offering the possibility of choosing the DARO &#x2b; ADT doublet in patients who are unable to choose the DARO triple therapy and supporting its doublet potential as a first-line treatment option. However, these results will only concern patients ineligible for the triplet. And the retrospective design of the study may introduce bias, and the limited follow-up duration precludes a comprehensive assessment of long-term efficacy and safety.</p>
<p>Despite Laila A. Gharzai&#x2019;s assertion that no endpoint has been validated as a surrogate endpoint for OS, that caution is essential when employing rPFS as a surrogate endpoint in clinical trial design, and that follow-up metrics must be optimized for enhanced assessment in future studies (<xref ref-type="bibr" rid="B10">Gharzai et al., 2023</xref>), the use of rPFS as the primary endpoint is not unprecedented. In numerous large-scale randomized controlled trials (RCTs), rPFS has also been used as a primary endpoint in some studies, although OS is often selected as the primary endpoint. In the present study, the relatively low number of patient deaths observed during the follow-up period, coupled with the unique characteristics of mHSPC led to the selection of rPFS as the primary endpoint. Future research should involve larger-scale, longer-term, multicenter, prospective studies with appropriate follow-up endpoints selected to further validate these findings and explore their implications for personalized treatment strategies.</p>
</sec>
<sec sec-type="conclusion" id="s5">
<title>5 Conclusion</title>
<p>This real-world study demonstrates that DARO &#x2b; ADT significantly improves clinical outcomes compared to AAP &#x2b; ADT in the treatment of mHSPC. DARO &#x2b; ADT delayed the time to mCRPC and showed superior PSA reduction rates, higher PSA50 and PSA90 response rates, and better secondary endpoints, including OS and rPFS. Both regimens exhibited comparable safety profiles, with no grade 3 or higher adverse events. These findings support DARO &#x2b; ADT as a promising first-line treatment for mHSPC, though larger, prospective studies are needed to confirm long-term efficacy and safety.</p>
</sec>
</body>
<back>
<sec sec-type="data-availability" id="s6">
<title>Data availability statement</title>
<p>The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.</p>
</sec>
<sec sec-type="ethics-statement" id="s7">
<title>Ethics statement</title>
<p>The studies involving humans were approved by Ethics Committee of Sichuan Provincial People&#x27;s Hospital. The studies were conducted in accordance with the local legislation and institutional requirements. The participants provided their written informed consent to participate in this study.</p>
</sec>
<sec sec-type="author-contributions" id="s8">
<title>Author contributions</title>
<p>TH: Data curation, Formal Analysis, Software, Writing &#x2013; original draft, Writing &#x2013; review and editing. FZ: Methodology, Writing &#x2013; original draft. YaZ: Data curation, Investigation, Writing &#x2013; review and editing. BL: Software, Writing &#x2013; original draft. YoZ: Data curation, Investigation, Writing &#x2013; review and editing. CG: Conceptualization, Formal Analysis, Writing &#x2013; review and editing. GW: Investigation, Methodology, Writing &#x2013; review and editing. JZ: Data curation, Project administration, Writing &#x2013; original draft. JT: Methodology, Resources, Writing &#x2013; original draft. YN: Formal Analysis, Resources, Writing &#x2013; review and editing. YF: Software, Writing &#x2013; review and editing. SR: Funding acquisition, Resources, Validation, Visualization, Writing &#x2013; review and editing. WD: Validation, Visualization, Writing &#x2013; review and editing. DW: Supervision, Validation, Writing &#x2013; review and editing.</p>
</sec>
<sec sec-type="funding-information" id="s9">
<title>Funding</title>
<p>The author(s) declare that financial support was received for the research and/or publication of this article. Network and Data Security Key Laboratory of Sichuan Province (NDS 2024-4) and Chuan Gan Yan (2024-216).</p>
</sec>
<sec sec-type="COI-statement" id="s10">
<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="s11">
<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="s12">
<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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