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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Immunol.</journal-id>
<journal-title>Frontiers in Immunology</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Immunol.</abbrev-journal-title>
<issn pub-type="epub">1664-3224</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/fimmu.2023.1125357</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Immunology</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Incidence, clinical characteristics and prognosis of tumor lysis syndrome following B-cell maturation antigen-targeted chimeric antigen receptor-T cell therapy in relapsed/refractory multiple myeloma</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Zhang</surname>
<given-names>Qiqi</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
<xref ref-type="author-notes" rid="fn003">
<sup>&#x2020;</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/1543031"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Zu</surname>
<given-names>Cheng</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
<xref ref-type="author-notes" rid="fn003">
<sup>&#x2020;</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/1434916"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Jing</surname>
<given-names>Ruirui</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
<xref ref-type="author-notes" rid="fn003">
<sup>&#x2020;</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Feng</surname>
<given-names>Youqin</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Zhang</surname>
<given-names>Yanlei</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Zhang</surname>
<given-names>Mingming</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/2213574"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Lv</surname>
<given-names>Yuqi</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Cui</surname>
<given-names>Jiazhen</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Zhou</surname>
<given-names>Linhui</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Meng</surname>
<given-names>Ye</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/1843288"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Wang</surname>
<given-names>Linqin</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Cen</surname>
<given-names>Zenan</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Chang</surname>
<given-names>Alex H.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
<xref ref-type="aff" rid="aff6">
<sup>6</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/1200043"/>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Hu</surname>
<given-names>Yongxian</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
<xref ref-type="author-notes" rid="fn001">
<sup>*</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/1318440"/>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Huang</surname>
<given-names>He</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
<xref ref-type="author-notes" rid="fn001">
<sup>*</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/1017990"/>
</contrib>
</contrib-group>
<aff id="aff1">
<sup>1</sup>
<institution>Bone Marrow Transplantation Center, the First Affiliated Hospital, Zhejiang University School of Medicine</institution>, <addr-line>Hangzhou</addr-line>, <country>China</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Liangzhu Laboratory, Zhejiang University Medical Center</institution>, <addr-line>Hangzhou</addr-line>, <country>China</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Institute of Hematology, Zhejiang University</institution>, <addr-line>Hangzhou</addr-line>, <country>China</country>
</aff>
<aff id="aff4">
<sup>4</sup>
<institution>Zhejiang Province Engineering Laboratory for Stem Cell and Immunity Therapy</institution>, <addr-line>Hangzhou</addr-line>, <country>China</country>
</aff>
<aff id="aff5">
<sup>5</sup>
<institution>Shanghai YaKe Biotechnology Ltd</institution>, <addr-line>Shanghai</addr-line>, <country>China</country>
</aff>
<aff id="aff6">
<sup>6</sup>
<institution>Clinical Translational Research Center, Shanghai Pulmonary Hospital, Tongji University School of Medicine</institution>, <addr-line>Shanghai</addr-line>, <country>China</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>Edited by: Nico Gagelmann, University Medical Center Hamburg-Eppendorf, Germany</p>
</fn>
<fn fn-type="edited-by">
<p>Reviewed by: Li Xiaoyang, Shanghai Jiao Tong University, China; Jian Hou, Shanghai Jiao Tong University, China</p>
</fn>
<fn fn-type="corresp" id="fn001">
<p>*Correspondence: Yongxian Hu, <email xlink:href="mailto:1313016@zju.edu.cn">1313016@zju.edu.cn</email>; He Huang, <email xlink:href="mailto:huanghe@zju.edu.cn">huanghe@zju.edu.cn</email>
</p>
</fn>
<fn fn-type="equal" id="fn003">
<p>&#x2020;These authors have contributed equally to this work</p>
</fn>
</author-notes>
<pub-date pub-type="epub">
<day>04</day>
<month>05</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="collection">
<year>2023</year>
</pub-date>
<volume>14</volume>
<elocation-id>1125357</elocation-id>
<history>
<date date-type="received">
<day>16</day>
<month>12</month>
<year>2022</year>
</date>
<date date-type="accepted">
<day>17</day>
<month>04</month>
<year>2023</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2023 Zhang, Zu, Jing, Feng, Zhang, Zhang, Lv, Cui, Zhou, Meng, Wang, Cen, Chang, Hu and Huang</copyright-statement>
<copyright-year>2023</copyright-year>
<copyright-holder>Zhang, Zu, Jing, Feng, Zhang, Zhang, Lv, Cui, Zhou, Meng, Wang, Cen, Chang, Hu and Huang</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>Background aims</title>
<p>B-cell maturation antigen (BCMA)-targeted chimeric antigen receptor-T cell (CAR-T) therapy is used for refractory or relapsed multiple myeloma (r/r MM). However, CAR-T-related tumor lysis syndrome (TLS) has been observed. We aimed to elucidate the incidence, clinical and laboratory characteristics, and prognosis of CAR-T cell-related TLS.</p>
</sec>
<sec>
<title>Methods</title>
<p>Patients (n=105) with r/r MM treated with BCMA-targeted CAR-T cell therapy were included. Patient characteristics, laboratory parameters, and clinical outcomes were assessed.</p>
</sec>
<sec>
<title>Results</title>
<p>Eighteen (17.1%) patients developed TLS after BCMA-targeted CAR-T cell therapy. The median time till TLS onset was 8 days. Patients with TLS had steep rise in uric acid (UA), creatinine, and lactate dehydrogenase (LDH) within 6 days following CAR-T cell infusion and presented earlier and persistent escalation of cytokines (C-reactive protein [CRP], interleukin-6 [IL-6], interferon-&#x3b3; [IFN-&#x3b3;], and ferritin levels). All 18 patients had cytokine release syndrome (CRS), of which 13 (72.2%) developed grade 3&#x2013;4 CRS. Three of 18 patients (16.7%) developed immune effector cell-associated neurotoxicity syndrome (ICANS): two patients with grade 1 ICANS and one with grade 2 ICANS. TLS development had a negative effect on the objective response rate (77.8% in the TLS group vs. 95.4% in the non-TLS group, p&lt;0.01). During the median follow-up of 15.1 months, the median PFS was poorer of patients with TLS (median: 3.4 months in the TLS group vs. 14.7 months in the non-TLS group, p&lt;0.001, hazard ratio [HR]=3.5 [95% confidence interval [CI] 1.5&#x2013;8.5]). Also, TLS development exhibited significant effects on OS (median: 5.0 months in the TLS group vs. 39.8 months in the non-TLS group, p&lt;0.001, hazard ratio [HR]=3.7 [95% CI 1.3&#x2013;10.3]). TLS was associated with a higher tumor burden, elevated baseline creatinine and UA levels, severe CRS, pronounced CAR-T cell expansion, and corticosteroid use.</p>
</sec>
<sec>
<title>Conclusion</title>
<p>TLS is a frequently observed CAR-T therapy complication and negatively influences clinical response and prognosis. Close monitoring for TLS should be implemented during CAR-T cell therapy, especially for those at high TLS risk.</p>
</sec>
</abstract>
<kwd-group>
<kwd>B-cell maturation antigen</kwd>
<kwd>chimeric antigen receptor-T</kwd>
<kwd>multiple myeloma</kwd>
<kwd>tumor lysis syndrome</kwd>
<kwd>immunotherapy</kwd>
</kwd-group>
<contract-sponsor id="cn001">National Natural Science Foundation of China<named-content content-type="fundref-id">10.13039/501100001809</named-content>
</contract-sponsor>
<counts>
<fig-count count="4"/>
<table-count count="1"/>
<equation-count count="0"/>
<ref-count count="47"/>
<page-count count="10"/>
<word-count count="3913"/>
</counts>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Cancer Immunity and Immunotherapy</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1" sec-type="intro">
<title>Introduction</title>
<p>Chimeric antigen receptor-T cell (CAR-T) therapy has revolutionized the field of cancer treatment, especially in the paradigm of hematological malignancies. B-cell maturation antigen (BCMA)-targeted CAR-T therapy has shown remarkable efficacy and safety in patients with chemotherapy-refractory or relapsed multiple myeloma (r/r MM) in several clinical trials, with overall response rates of 50&#x2013;98% and a complete response rate of 80% (<xref ref-type="bibr" rid="B1">1</xref>&#x2013;<xref ref-type="bibr" rid="B3">3</xref>). However, treatment-related toxicities following CAR-T therapy remain a major obstacle to its broad clinical application. These include a life-threatening complication, tumor lysis syndrome (TLS), which has been reported with CD19-targeted CAR-T therapy. A previous study on CD19 CAR-T therapy has reported that 14.3% (2/14) of patients with chronic lymphoid leukemia (CLL) developed TLS during treatment. Another study of donor-derived allogeneic anti-CD19 CAR-T cells has also reported TLS in a progressive CLL patient with bulky adenopathy (<xref ref-type="bibr" rid="B4">4</xref>). However, data on CAR-T therapy-related TLS, which is a high-morbidity emergency requiring early recognition and prompt management, are limited. Hence, a comprehensive characterization of CAR-T therapy-associated TLS is urgently needed.</p>
<p>TLS results from the rapid destruction of tumor cells and massive release of intracellular components (such as potassium, phosphate, nucleic acids, cytokines) into the blood. TLS presents as a combination of metabolic disorders including hyperuricemia, hyperkalemia, hyperphosphatemia, and hypocalcemia, which lead to acute renal insufficiency, arrhythmia, epilepsy, and even sudden death (<xref ref-type="bibr" rid="B5">5</xref>, <xref ref-type="bibr" rid="B6">6</xref>). MM is considered a low-proliferative malignancy with a rare incidence of TLS (<xref ref-type="bibr" rid="B7">7</xref>); however, with the emergence of novel therapeutic regimens in r/r MM, the incidence of TLS in MM has increased (<xref ref-type="bibr" rid="B8">8</xref>, <xref ref-type="bibr" rid="B9">9</xref>).</p>
<p>Considering the distinct characteristics of CAR-T therapy-related TLS, we performed a <italic>post-hoc</italic> analysis of r/r MM to explore the incidence, clinical and laboratory characteristics as well as prognosis of CAR-T therapy-related TLS. This study aids early identification of patients at high risk of TLS during CAR-T cell therapy and the diagnosis and treatment of TLS.</p>
</sec>
<sec id="s2">
<title>Methods</title>
<sec id="s2_1">
<title>Patients</title>
<p>This was a retrospective, single-institution analysis of patients with r/r MM treated with BCMA-targeted CAR-T cell therapy between July 2018 and December 2022 (n=99) (Chictr.org number, ChiCTR1800017404), and between June 2022 and August 2022 (n=6) (NCT05430945). The study was approved by the First Affiliated Hospital, School of Medicine, Zhejiang University Institutional Review Board and was conducted in accordance with the Declaration of Helsinki. All patients provided written informed consent to participate in the study. All patients received lymphodepletion chemotherapy with fludarabine 30 mg/m<sup>2</sup> (days &#x2212;4 to &#x2212;2) and cyclophosphamide 500 mg/m<sup>2</sup> (days &#x2212;3 to &#x2212;2), followed by CAR-T cell infusion on day 0. The manufacture of BCMA-targeted CAR-T cells has been described previously (<xref ref-type="bibr" rid="B10">10</xref>).</p>
</sec>
<sec id="s2_2">
<title>Data collection</title>
<p>Patient, laboratory, and clinical data were obtained from the medical records of the First Affiliated Hospital, School of Medicine, Zhejiang University. All data collection and analyses were performed with approval from the Clinical Research Ethics Committee of the same institution.</p>
</sec>
<sec id="s2_3">
<title>Toxicity evaluations</title>
<p>Cytokine release syndrome (CRS) was graded using the American Society for Transplantation and Cellular Therapy Consensus Grading for CRS (<xref ref-type="bibr" rid="B11">11</xref>). TLS was identified considering laboratory parameters and clinical manifestations according to the Howard criteria (<xref ref-type="bibr" rid="B5">5</xref>). Diagnosis of TLS requires at least two of the following metabolic abnormalities to be present during the same 24-hour period: uric acid (UA) level &gt; 8.0 mg/dL (475.8 &#x3bc;mol/L) in adults or above the upper limit of the normal (ULN) range for age in children; phosphorus level &gt; 4.5 mg/dL (1.5 mmol/L) in adults or &gt; 6.5 mg/dL (2.1 mmol/L) in children; potassium level &gt; 6.0 mmol/L; and corrected calcium level &lt; 7.0 mg/dL (1.75 mmol/L) or ionized calcium level &lt; 4.5 mg/dL (1.12 mmol/L). Clinical TLS according to the Howard criteria requires the presence of laboratory TLS in addition to any one of the following: increase of 0.3 mg/dL from baseline in serum creatinine level (or a single value &gt; 1.5 times the ULN if no baseline creatinine level is available) or presence of oliguria defined as an average urine output &lt; 0.5 mL/kg/h for 6 hours, cardiac dysrhythmia, seizures, or death either probably or definitely caused by the aforementioned metabolic abnormalities (<xref ref-type="bibr" rid="B5">5</xref>).</p>
</sec>
<sec id="s2_4">
<title>Statistical analysis</title>
<p>Categorical parameters were compared using Fisher&#x2019;s exact test or the &#x3c7;<sup>2</sup> test. Continuous parameters were compared using the Mann&#x2013;Whitney U test. Kaplan&#x2013;Meier curves for progression-free survival (PFS) and overall survival (OS) were compared using log-rank tests. Univariate analysis was performed using Fisher&#x2019;s exact test or the &#x3c7;<sup>2</sup> test to describe associations between categorical variables. Statistical analyses and plots were generated using the Statistical Package for the Social Sciences (version 26) and R software (version 4.1.1).</p>
</sec>
</sec>
<sec id="s3" sec-type="results">
<title>Results</title>
<sec id="s3_1">
<title>Incidence and characteristics of CAR-T therapy-related TLS</title>
<p>Of 105 patients who received BCMA-targeted CAR-T cell administration, 18 (17.1%) developed TLS (<xref ref-type="table" rid="T1">
<bold>Table&#xa0;1</bold>
</xref>). The median time from CAR-T cell infusion to TLS onset was 8 days (range, 4&#x2013;14).</p>
<table-wrap id="T1" position="float">
<label>Table&#xa0;1</label>
<caption>
<p>Clinical characteristics of patients with and without tumor lysis syndrome following B-cell maturation antigen-targeted chimeric antigen receptor-T cell therapy.</p>
</caption>
<table frame="hsides">
<thead>
<tr>
<th valign="middle" align="left">Characteristics</th>
<th valign="top" align="left">Total (n=105)</th>
<th valign="middle" align="left">No TLS (n=87)</th>
<th valign="middle" align="left">TLS (n=18)</th>
<th valign="middle" align="left">
<italic>P</italic> value</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="middle" align="left">Sex, male, n (%)</td>
<td valign="top" align="left">62 (59.0%)</td>
<td valign="middle" align="left">50 (57.5%)</td>
<td valign="middle" align="left">12 (66.7%)</td>
<td valign="middle" align="center">NS</td>
</tr>
<tr>
<td valign="middle" align="left">Age (years), median (range)</td>
<td valign="top" align="left">60 (16&#x2013;84)</td>
<td valign="middle" align="left">60 (39&#x2013;84)</td>
<td valign="middle" align="left">59 (16&#x2013;71)</td>
<td valign="middle" align="center">NS</td>
</tr>
<tr>
<th valign="middle" colspan="5" align="left">Types of myeloma, n (%)</th>
</tr>
<tr>
<td valign="middle" align="left">IgA</td>
<td valign="top" align="left">30 (28.6%)</td>
<td valign="middle" align="left">26 (29.9%)</td>
<td valign="middle" align="left">4 (22.2%)</td>
<td valign="middle" align="center">NS</td>
</tr>
<tr>
<td valign="middle" align="left">IgD</td>
<td valign="top" align="left">9 (8.6%)</td>
<td valign="middle" align="left">7 (8.0%)</td>
<td valign="middle" align="left">2 (11.1%)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">IgG</td>
<td valign="top" align="left">40 (38.1%)</td>
<td valign="middle" align="left">36 (41.4%)</td>
<td valign="middle" align="left">4 (22.2%)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">Light chain</td>
<td valign="middle" align="left">25 (23.8%)</td>
<td valign="middle" align="left">18 (20.7%)</td>
<td valign="middle" align="left">7 (38.9%)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">Non-secretory</td>
<td valign="top" align="left">1 (1.0%)</td>
<td valign="middle" align="left">1 (5.6%)</td>
<td valign="middle" align="left">1 (5.9%)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">High-risk cytogenetic, n (%)</td>
<td valign="middle" align="left">71 (67.6%)</td>
<td valign="middle" align="left">58 (66.7%)</td>
<td valign="middle" align="left">13 (72.2%)</td>
<td valign="middle" align="center">NS</td>
</tr>
<tr>
<th valign="middle" colspan="5" align="left">Durie&#x2013;Salmon stage, n (%)</th>
</tr>
<tr>
<td valign="middle" align="left">I</td>
<td valign="middle" align="left">3 (2.9%)</td>
<td valign="middle" align="left">3 (3.4%)</td>
<td valign="middle" align="left">0 (0%)</td>
<td valign="middle" align="center">NS</td>
</tr>
<tr>
<td valign="middle" align="left">II</td>
<td valign="middle" align="left">11 (10.5%)</td>
<td valign="middle" align="left">10 (11.5%)</td>
<td valign="middle" align="left">1 (5.6%)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">III</td>
<td valign="middle" align="left">84 (80.0%)</td>
<td valign="middle" align="left">70 (80.5%)</td>
<td valign="middle" align="left">14 (77.8%)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<th valign="middle" colspan="5" align="left">Disease burden</th>
</tr>
<tr>
<td valign="middle" align="left">Percentage of plasma blasts in BM, median (IQR)</td>
<td valign="top" align="left">10.5(1.6, 38.0)</td>
<td valign="middle" align="left">10.0 (1.2, 32.5)</td>
<td valign="middle" align="left">31.5(3.1, 50.0)</td>
<td valign="middle" align="center">&lt;0.05</td>
</tr>
<tr>
<td valign="middle" align="left">Extramedullary disease, (n%)</td>
<td valign="top" align="left">53 (50.5%)</td>
<td valign="middle" align="left">45 (51.7%)</td>
<td valign="middle" align="left">8 (44.4%)</td>
<td valign="middle" align="center">NS</td>
</tr>
<tr>
<td valign="middle" align="left">LDH (U/L), median (range)</td>
<td valign="top" align="left">194 (85&#x2013;2240)</td>
<td valign="middle" align="left">194 (194&#x2013;2240)</td>
<td valign="middle" align="left">199 (159&#x2013;571)</td>
<td valign="middle" align="center">NS</td>
</tr>
<tr>
<th valign="middle" colspan="5" align="left">Prior therapy</th>
</tr>
<tr>
<td valign="middle" align="left">Previous lines of therapy, median (range)</td>
<td valign="top" align="left">3 (1&#x2013;9)</td>
<td valign="middle" align="left">3 (1&#x2013;9)</td>
<td valign="middle" align="left">3 (1&#x2013;6)</td>
<td valign="middle" align="center">NS</td>
</tr>
<tr>
<td valign="middle" align="left">Previous ASCT</td>
<td valign="top" align="left">51 (48.6%)</td>
<td valign="middle" align="left">39 (44.8%)</td>
<td valign="middle" align="left">12 (66.7%)</td>
<td valign="middle" align="center">NS</td>
</tr>
<tr>
<td valign="middle" align="left">Baseline creatinine (&#x3bc;mol/L), median (IQR)</td>
<td valign="top" align="left">70.0 (57.0-90.0)</td>
<td valign="middle" align="left">68.0 (55.5, 86.5)</td>
<td valign="middle" align="left">92.5 (70.5, 160.5)</td>
<td valign="middle" align="center">&lt;0.01</td>
</tr>
<tr>
<td valign="middle" align="left">Baseline uric acid (&#x3bc;mol/L), median (range)</td>
<td valign="top" align="left">319 (88&#x2013;612)</td>
<td valign="middle" align="left">313 (88&#x2013;597)</td>
<td valign="middle" align="left">428 (197&#x2013;612)</td>
<td valign="middle" align="center">&lt;0.01</td>
</tr>
<tr>
<th valign="middle" colspan="5" align="left">CRS</th>
</tr>
<tr>
<td valign="middle" align="left">Max grade 0</td>
<td valign="middle" align="left">3 (2.9%)</td>
<td valign="middle" align="left">3 (3.4%)</td>
<td valign="middle" align="left">0 (0%)</td>
<td valign="middle" align="center">&lt;0.01</td>
</tr>
<tr>
<td valign="middle" align="left">Max grade 1</td>
<td valign="middle" align="left">17 (16.2%)</td>
<td valign="middle" align="left">16 (18.4%)</td>
<td valign="middle" align="left">1 (5.6%)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">Max grade 2</td>
<td valign="middle" align="left">38 (36.2%)</td>
<td valign="middle" align="left">34 (39.1%)</td>
<td valign="middle" align="left">4 (22.2%)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">Max grade 3</td>
<td valign="middle" align="left">43 (41.0%)</td>
<td valign="middle" align="left">34 (39.1%)</td>
<td valign="middle" align="left">9 (50.0%)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">Max grade 4</td>
<td valign="middle" align="left">4 (3.8%)</td>
<td valign="middle" align="left">0 (0%)</td>
<td valign="middle" align="left">4 (22.2%)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<th valign="middle" colspan="5" align="left">Toxicity management</th>
</tr>
<tr>
<td valign="middle" align="left">Received tocilizumab</td>
<td valign="middle" align="left">37 (35.2%)</td>
<td valign="middle" align="left">28 (32.2%)</td>
<td valign="middle" align="left">9 (50.0%)</td>
<td valign="middle" align="center">NS</td>
</tr>
<tr>
<td valign="middle" align="left">Received corticosteroids</td>
<td valign="middle" align="left">43 (41.0%)</td>
<td valign="middle" align="left">12 (66.7%)</td>
<td valign="middle" align="left">9 (50.0%)</td>
<td valign="middle" align="center">&lt;0.01</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>BM, bone marrow; IQR, interquartile range; CRS, cytokine release syndrome; ASCT, autologous stem cell transplant; LDH, lactate dehydrogenase. ns, not significant.</p>
</fn>
</table-wrap-foot>
</table-wrap>
<p>Patients with TLS had hyperuricemia, hyperkalemia, hyperphosphatemia, hypocalcemia, and elevated lactate dehydrogenase (LDH) levels (<xref ref-type="bibr" rid="B12">12</xref>). All 18 patients developed renal dysfunction, indicated by elevated serum creatinine levels, oliguria, or anuria. Eight patients (47.1%) had arrhythmia, mostly presenting as atrial fibrillation. All 18 patients had CRS: 13 (72.2%) developed grade 3&#x2013;4 CRS. The median time to CRS onset of any grade was 1 day (range, 1&#x2013;17). Two patients developed TLS before CRS; remaining developed TLS after CRS. Three of 18 patients (16.7%) developed immune effector cell-associated neurotoxicity syndrome (ICANS): two patients with grade 1 ICANS and one with grade 2 ICANS.</p>
<p>To identify clinical and laboratory features associated with TLS in r/r MM patients after BCMA-targeted CAR-T cell therapy, we examined demographic characteristics, baseline and post-infusion clinical features, and laboratory findings (<xref ref-type="table" rid="T1">
<bold>Table&#xa0;1</bold>
</xref>). Baseline was defined as the time point before administration of lymphodepleting drugs. Univariate analysis revealed that elevated baseline creatinine and UA levels, and disease burden correlated with TLS development (<xref ref-type="bibr" rid="B12">12</xref>). We did not identify differences in demographic features, disease subtypes, cytogenetic status, Durie&#x2013;Salmon stage, and prior therapy between those with and without TLS. Of note, the maximum CRS grade after CAR-T cell infusion was significantly different between patients with and without TLS.</p>
<p>The anti-interleukin (IL)-6 receptor monoclonal antibody tocilizumab and/or corticosteroids have been used to mitigate TLS. Seven (38.9%) of 18 patients received tocilizumab plus corticosteroids; two (11.1%), tocilizumab alone; and five (27.8%), corticosteroid alone. Corticosteroid use was positively associated with TLS, whereas tocilizumab use indicated no difference. Of 18 patients with renal dysfunction, 5 received continuous renal replacement therapy for the median duration of 6.5 days (range, 3&#x2013;23).</p>
</sec>
<sec id="s3_2">
<title>Clinical outcomes</title>
<p>Overall, 55 (52.4%) patients achieved complete remission (CR) with BCMA-targeted CAR-T therapy. Fifteen (14.3%) patients had very-good-partial remission (VGPR), and 27 (25.7%) had partial remission (PR). Among 18 patients with TLS, 8 (47.0%) achieved CR, 3 (17.6%) had VGPR, 3 (11.8%) had PR, and the remaining 4 (23.5%) had progressive disease. TLS development had a negative effect on the objective response rate (p&lt;0.01) (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1A</bold>
</xref>).</p>
<fig id="f1" position="float">
<label>Figure&#xa0;1</label>
<caption>
<p>Clinical outcomes of tumor lysis syndrome (TLS) in patients receiving B-cell maturation antigen-targeted chimeric antigen receptor-T cell (CAR-T) therapy. <bold>(A)</bold> Best clinical response 1 month after CAR-T infusion. <bold>(B)</bold> Kaplan&#x2013;Meier estimate of progression-free survival of patients with or without TLS. <bold>(C)</bold> Kaplan&#x2013;Meier estimate of overall survival of patients with and without TLS. *** means &#x201c;p value&lt;0.001&#x201d;.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fimmu-14-1125357-g001.tif"/>
</fig>
<p>During the median follow-up of 15.1 months, the median PFS was poorer of patients with TLS (median: 3.4 months in the TLS group vs. 14.7 months in the non-TLS group, p&lt;0.001, hazard ratio [HR]=3.5 [95% confidence interval [CI] 1.5&#x2013;8.5]) (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1B</bold>
</xref>). Also, TLS development exhibited significant effects on OS (median: 5.0 months in the TLS group vs. 39.8 months in the non-TLS group, p&lt;0.001, hazard ratio [HR]=3.7 [95% CI 1.3&#x2013;10.3]) (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1C</bold>
</xref>).</p>
</sec>
<sec id="s3_3">
<title>Temporal changes of laboratory findings in patients with TLS</title>
<p>The temporal dynamics of the laboratory parameters associated with TLS during the clinical course was in agreement with previous reports. Patients with TLS had prolonged and pronounced hyperuricemia, hyperkalemia, hyperphosphatemia, hypocalcemia, and elevated levels of serum LDH after CAR-T infusion (<xref ref-type="fig" rid="f2">
<bold>Figures&#xa0;2A&#x2013;F</bold>
</xref>) when compared with those without TLS. UA, creatinine, potassium, and phosphate levels were persistently elevated from day 6 post-infusion to approximately 3 weeks post-infusion, while calcium levels remained low from day 9 post-infusion to 3 weeks post-infusion. LDH exhibited an intermittent increase from days 4 to 14 in patients with TLS. Patients with TLS had higher white blood cell count, lower platelet count, and lower hemoglobin levels than those without TLS (<xref ref-type="fig" rid="f2">
<bold>Figures&#xa0;2G&#x2013;I</bold>
</xref>).</p>
<fig id="f2" position="float">
<label>Figure&#xa0;2</label>
<caption>
<p>Laboratory values of tumor lysis syndrome (TLS)-related biomarkers and trends relative to B-cell maturation antigen-targeted chimeric antigen receptor-T cell (CAR-T) infusion. Each dot indicates the mean value at a different time point. The error bands indicate the estimated 68% confidence interval. Asterisks denote p&lt;0.05 per the Mann&#x2013;Whitney U test. <bold>(A)</bold> Uric acid (days &#x2212;3 to 21). <bold>(B)</bold> Creatinine (days &#x2212;3 to 21). <bold>(C)</bold> Lactate dehydrogenase (LDH) (days &#x2212;3 to 21). <bold>(D)</bold> Potassium (K) (days &#x2212;3 to 21). <bold>(E)</bold> Calcium (Ca) (days &#x2212;3 to 21). <bold>(F)</bold> Phosphate (P) (days &#x2212;3 to 21). <bold>(G)</bold> White blood cell counts (days &#x2212;3 to 21). <bold>(H)</bold> Hemoglobin (days &#x2212;3 to 21). <bold>(I)</bold> Platelet counts (days &#x2212;3 to 21).</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fimmu-14-1125357-g002.tif"/>
</fig>
</sec>
<sec id="s3_4">
<title>Dynamics of cytokines during treatment</title>
<p>As we observed a significant difference in CRS grades in patients with and without TLS, we performed serial cytokine profiling to study the inflammatory patterns between the two groups. Patients who developed TLS had earlier and more persistent escalation of cytokine levels, suggesting early and profound systemic inflammation. In patients with TLS, several inflammatory cytokines including C-reactive protein (CRP), IL-6, interferon-&#x3b3; (IFN-&#x3b3;), and ferritin levels were persistently elevated from days 5 to 18, and these cytokines showed biphasic lifting-up when compared with those in patients without TLS (<xref ref-type="fig" rid="f3">
<bold>Figures&#xa0;3A&#x2013;F</bold>
</xref>). Contrastingly, tumor necrosis factor-&#x3b1; level increased in the later stages and exhibited no significant differences in patients with TLS. No significant difference in the expression pattern of IL-4 was observed. Although the etiology of TLS following CAR-T therapy is unclear, cytokines and TLS may exhibit a complex interplay.</p>
<fig id="f3" position="float">
<label>Figure&#xa0;3</label>
<caption>
<p>Serial cytokine profiling relative to B-cell maturation antigen-targeted chimeric antigen receptor-T cell (CAR-T) infusion. Each dot indicates the mean value of each time point. The error bands indicate the estimated 68% confidence interval. Asterisks denote p&lt;0.05 per the Mann&#x2013;Whitney U test. <bold>(A)</bold> C-reactive protein (days &#x2212;3 to 21). <bold>(B)</bold> Interleukin-4 (IL-4) (days &#x2212;3 to 21). <bold>(C)</bold> Interleukin-6 (IL-6) (days &#x2212;3 to 21). <bold>(D)</bold> Tumor necrosis factor-&#x3b1; (TNF-&#x3b1;) (days &#x2212;3 to 21). <bold>(E)</bold> Interferon-&#x3b3; (INF-&#x3b3;) (days &#x2212;3 to 21). <bold>(F)</bold> Ferritin (days &#x2212;3 to 21).</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fimmu-14-1125357-g003.tif"/>
</fig>
</sec>
<sec id="s3_5">
<title>CAR-T cell expansion in TLS</title>
<p>Higher CAR-T cell expansion (absolute CAR-T cell count and its proportion in CD3<sup>+</sup> T cells) was observed in patients with TLS, indicating that prominent CAR-T cell expansion positively correlates with a higher risk of TLS following CAR-T therapy (p&lt;0.01) (<xref ref-type="fig" rid="f4">
<bold>Figures&#xa0;4A, B</bold>
</xref>). The absolute peripheral CAR-T cell count and its proportion in peripheral CD3<sup>+</sup> T cells were predominantly higher in patients with TLS. The time point at which we noted a rise in CAR-T cell count coincided with TLS onset time, suggesting causality between CAR-T cell expansion and tumor lysis (<xref ref-type="fig" rid="f4">
<bold>Figures&#xa0;4C, D</bold>
</xref>). This did however not reach statistical significance, considering the limited sample size.</p>
<fig id="f4" position="float">
<label>Figure&#xa0;4</label>
<caption>
<p>
<italic>In vivo</italic> chimeric antigen receptor-T cell (CAR-T) cell expansion following B-cell maturation antigen-targeted CAR-T therapy for patients with and without TLS. <bold>(A)</bold> Peak values of absolute counts of peripheral CAR-T cells. The scatter plot depicts all values, and lines represent median and interquartile range (IQR). <bold>(B)</bold> Peak values of proportions of peripheral CAR-T cells in CD<sup>3+</sup> T cells. The scatter plot depicts all values, and lines represent median and IQR. <bold>(C)</bold> Absolute counts of peripheral CAR-T cells post CAR-T infusion (days 1 to 21). Each dot indicates the mean value of each time point. The error bands indicate the estimated 68% confidence interval. <bold>(D)</bold> Proportion of peripheral CAR-T cells in CD<sup>3+</sup> T cells post CAR-T infusion (days 1 to 21). Each dot indicates the mean value at a different time point. The error bands indicate the estimated 68% confidence interval. All asterisks denote p&lt;0.05 per the Mann&#x2013;Whitney U test.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fimmu-14-1125357-g004.tif"/>
</fig>
</sec>
</sec>
<sec id="s4" sec-type="discussion">
<title>Discussion</title>
<p>CAR-T therapy has been promising, especially in r/r hematological malignancies (<xref ref-type="bibr" rid="B2">2</xref>, <xref ref-type="bibr" rid="B13">13</xref>, <xref ref-type="bibr" rid="B14">14</xref>). Recognizing CAR-T cell-related toxicities is substantial for improving its clinical application (<xref ref-type="bibr" rid="B15">15</xref>). Several TLS cases after CD19 CAR-T therapy have been observed (<xref ref-type="bibr" rid="B4">4</xref>, <xref ref-type="bibr" rid="B16">16</xref>); however, TLS in the context of BCMA-targeted CAR-T therapy has not been reported, and recognizing TLS as a vital CAR-T cell-related toxicity is imperative. Here, we present the most comprehensive clinical and laboratory characterization of TLS following BCMA-targeted CAR-T cell therapy.</p>
<p>In our cohort, TLS incidence following BCMA-targeted CAR-T therapy was 17.1%, indicating that TLS is a relatively common complication in r/r MM treated with CAR-T cells, similar to the previously reported incidence of CD19 CAR-T therapy (<xref ref-type="bibr" rid="B4">4</xref>, <xref ref-type="bibr" rid="B16">16</xref>). However, TLS incidence in MM is higher than that with other therapeutics (<xref ref-type="bibr" rid="B8">8</xref>, <xref ref-type="bibr" rid="B9">9</xref>). Additionally, in accordance with previous studies, TLS following CAR-T therapy showed detrimental effects on patient prognosis, clinical response, PFS and OS. Acute kidney injury (AKI) had high prevalence during the acute phase of TLS and was reported as a major cause of death in TLS with an OR of 10.41 for in-hospital mortality (<xref ref-type="bibr" rid="B17">17</xref>&#x2013;<xref ref-type="bibr" rid="B19">19</xref>). In our cohort, TLS related AKI resulted in ICU administration, renal replacement therapy and 30-day modality. Arrhythmia secondary to TLS was also detrimental. Cardiac arrest and sudden death were reported due to TLS (<xref ref-type="bibr" rid="B20">20</xref>).</p>
<p>CAR-T cells exhibit a unique profile of toxicity as cellular products. We explored temporal changes in TLS-related laboratory examinations and observed that patients with TLS presented with persistent hyperuricemia, hyperkalemia, hyperphosphatemia, and hypocalcemia after CAR-T infusion. Occasional late-onset TLS was also noted. Considering we noticed that the TLS onset coincides with the rise in the CAR-T cell count-time curve, these findings could be interpreted as delayed CAR-T cell expansion and ongoing anti-myeloma efficacy.</p>
<p>Previous studies have identified several TLS risk factors in MM such as older age, high disease burden, myeloma cells in peripheral blood, bortezomib use, impaired renal function, and elevated baseline UA (<xref ref-type="bibr" rid="B9">9</xref>, <xref ref-type="bibr" rid="B21">21</xref>); however, the established predictive markers may have overlooked the potential pathophysiological influence of CAR-T cells. As cellular products, CAR-T cells exhibit a unique profile of toxicities distinct from those of chemotherapy drugs. In our cohort, higher tumor burden, elevated creatinine and UA levels, severe CRS grade, prominent CAR-T expansion, and corticosteroid use were positively associated with TLS on univariate analysis. High disease burden, renal dysfunction, kidney involvement and hyperuricemia are established risk factors for TLS (<xref ref-type="bibr" rid="B7">7</xref>, <xref ref-type="bibr" rid="B9">9</xref>, <xref ref-type="bibr" rid="B21">21</xref>), whereas CRS and CAR-T expansion are newly uncovered risk factors for CAR-T-related TLS, the underlying relationship of which is worth further investigation.</p>
<p>Our findings suggest that patients with severe CRS are predisposed to developing TLS. It is reasonable to hypothesize that patients with high tumor burden tend to develop CRS and TLS simultaneously, as disease burden is well recognized contributing factor for both CRS (<xref ref-type="bibr" rid="B22">22</xref>, <xref ref-type="bibr" rid="B23">23</xref>) and TLS (<xref ref-type="bibr" rid="B7">7</xref>, <xref ref-type="bibr" rid="B24">24</xref>). Besides, our observations suggested that CAR-T cell expansion is associated with TLS. Higher expansion of CAR-T cells is also associated with both CRS (<xref ref-type="bibr" rid="B25">25</xref>), thus we suppose patients with predominant CAR-T cell expansion are likely to develop CRS and TLS simultaneously. We postulate that although profound CAR-T cell expansion produces superior anti-tumor efficacy, it may magnify the risk of toxicities, including CRS and TLS.</p>
<p>But beyond all that, CRS and TLS may have a complex interplay that needs to be elucidated. CRS etiology has not yet been fully elucidated. Current hypotheses include inflammatory cytokines and chemokines released by CAR-T cells, activated monocytes and macrophages, endothelial injury, vascular leakage and subsequent acute systemic inflammatory symptoms, and secondary organ dysfunction (<xref ref-type="bibr" rid="B26">26</xref>, <xref ref-type="bibr" rid="B27">27</xref>). On the one hand, the intracellular substances released during tumor cell lysis may promote a systematic inflammatory response and trigger CRS. On the other hand, strikingly elevated cytokines in CRS may contribute to TLS development, as we noted a dramatic increase in IL-6, INF-&#x3b3;, and ferritin levels during TLS, and these cytokines trigger inflammatory cell death, apoptosis, and pyroptosis (<xref ref-type="bibr" rid="B27">27</xref>&#x2013;<xref ref-type="bibr" rid="B29">29</xref>). Elevation of serum IL-6 levels was reported in a patient with Hodgkin&#x2019;s lymphoma who developed TLS after chemotherapy (<xref ref-type="bibr" rid="B30">30</xref>). Recently, Supiot et&#xa0;al. reported that a patient with MM simultaneously developed TLS and CRS after radiotherapy (<xref ref-type="bibr" rid="B31">31</xref>). Systemic inflammatory response syndrome and multiple organ dysfunction were observed in patients with TLS and hematological malignancies or solid tumors (<xref ref-type="bibr" rid="B32">32</xref>).</p>
<p>Of note, an association between corticosteroid use and TLS was observed in our study, although the causal relationship could not be determined since not all patients received corticosteroids before TLS onset. Corticosteroids are widely administered to manage CAR-T cell-related toxicities, and studies have shown that prophylactic use and earlier dosing have the potential to reduce the incidence of severe CRS and neurologic events (<xref ref-type="bibr" rid="B33">33</xref>, <xref ref-type="bibr" rid="B34">34</xref>). However, concerns have been raised postulating the possible role of steroids in increasing TLS risk. Steroids have anti-tumor cytotoxicity and are widely used as components of chemotherapy in the frontline treatment of hematologic malignancies (<xref ref-type="bibr" rid="B35">35</xref>). Corticosteroid-induced TLS has been reported in patients with hematological malignancies and solid tumors (<xref ref-type="bibr" rid="B36">36</xref>&#x2013;<xref ref-type="bibr" rid="B40">40</xref>). Although TLS rarely occurs after single-agent corticosteroid administration, clinicians prescribing corticosteroids to patients should be aware of this life-threatening complication.</p>
<p>The potential morbidity resulting from TLS necessitates prophylactic measures for at-risk patients. Recognizing risk factors and closely monitoring electrolytes, renal function, and cytokine levels can prevent TLS (<xref ref-type="bibr" rid="B24">24</xref>). Major prevention strategies include hydration and UA level control (<xref ref-type="bibr" rid="B24">24</xref>). For patients with elevated plasma UA levels, current recommendations for TLS prophylaxis include allopurinol (<xref ref-type="bibr" rid="B24">24</xref>), rasburicase (<xref ref-type="bibr" rid="B41">41</xref>), and febuxostat (<xref ref-type="bibr" rid="B42">42</xref>). Our novel findings suggest that controlling CRS reduces TLS risk. For those with severe CRS or cytokine hypersecretion, controlling CRS or administering cytokine inhibitors may help prevent subsequent TLS. Ruxolitinib, a Janus kinase (JAK)1/JAK2 inhibitor, can downregulate pro-inflammatory cytokine signaling (<xref ref-type="bibr" rid="B43">43</xref>, <xref ref-type="bibr" rid="B44">44</xref>). Another JAK1 inhibitor, itacitinib, also reduced cytokines such as IFN-&#x3b3; and IL-6 in CAR-T-induced CRS in a preclinical study (<xref ref-type="bibr" rid="B45">45</xref>). Additionally, the IL-6 receptor antagonist tocilizumab has been widely used to treat CAR-T cell-related toxicities, especially CRS (<xref ref-type="bibr" rid="B46">46</xref>, <xref ref-type="bibr" rid="B47">47</xref>).</p>
<p>In the setting of CAR-T related TLS in MM, most patients manifested with renal dysfunction. Aggressive hydration, management of hyperuricemia, and hemodialysis for severe renal failure are recommended (<xref ref-type="bibr" rid="B24">24</xref>). For patients with electrolytic disturbances, treating hyperphosphatemia, hyperkalemia, and hypocalcemia is necessary. Additionally, antiarrhythmics are required for confirmed arrhythmias. Prompt intervention to correct hyperkalemia and hypocalcemia is also paramount to manage cardiac arrhythmias. Alkalinization is currently not recommended because unequivocal evidence of efficacy is lacking (<xref ref-type="bibr" rid="B7">7</xref>).</p>
<p>In conclusion, implementing prophylaxis for TLS during CAR-T therapy is reasonable, especially for patients with high disease burden and pre-existing renal insufficiency and for those experiencing severe CRS during the course. Clinicians should closely monitor electrolytes, renal function and cytokines during CAR-T therapy to prevent life-threatening TLS.</p>
</sec>
<sec id="s5" sec-type="data-availability">
<title>Data availability statement</title>
<p>The original contributions presented in the study are included in the article/supplementary material. Further inquiries can be directed to the corresponding authors.</p>
</sec>
<sec id="s6" sec-type="ethics-statement">
<title>Ethics statement</title>
<p>The studies involving human participants were reviewed and approved by Clinical Research Ethics Committee of the First Affiliated Hospital, School of Medicine, Zhejiang University. Written informed consent to participate in this study was provided by the participants&#x2019; legal guardian/next of kin.</p>
</sec>
<sec id="s7" sec-type="author-contributions">
<title>Author contributions</title>
<p>QZ, YH and HH designed the study. QZ, CZ, RJ, YF, YM and JC analyzed and interpreted the data. QZ, CZ, RJ, YH, and HH drafted the article. LZ, YM, LW, and CZ revised the article. AC and YZ helped the manufacture of CAR-T cells. YH, MZ, CZ and HH provided CAR-T cell treatment and care to patients. All authors contributed to the article and approved the submitted version.</p>
</sec>
</body>
<back>
<sec id="s8" sec-type="funding-information">
<title>Funding</title>
<p>This work was supported by Zhejiang Provincial Key Medical Discipline (Medical Tissue Engineering). We sincerely thank the support from the National Natural Science Foundation of China (81730008).</p>
</sec>
<ack>
<title>Acknowledgments</title>
<p> We sincerely thank the patient and his family for their trust and all colleagues for their efforts from the Bone Marrow Transplantation Center, The First Affiliated Hospital, School of Medicine, Zhejiang University. </p>
</ack>
<sec id="s9" sec-type="COI-statement">
<title>Conflict of interest</title>
<p>Authors YZ and AC are employed by Shanghai YaKe Biotechnology Ltd.</p>
<p>The remaining 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 id="s10" 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>
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