Cytokine release syndrome and neurotoxicity following CAR T-cell therapy for hematologic malignancies
Open accessAbstract
Chimeric antigen receptor T cells are a new and exciting immunotherapeutic approach to managing cancer, with impressive efficacy but potentially life-threatening inflammatory toxicities such as cytokine release syndrome (CRS) and immune effector cell-associated neurotoxicity syndrome (ICANS). Patients with severe CRS may develop capillary leak syndrome and disseminated intravascular coagulation, with a cytokine signature similar to that of macrophage activation syndrome/hemophagocytic lymphohistiocytosis. Moderate-to-severe CRS is managed with the IL-6 receptor antagonist tocilizumab with or without corticosteroids, with questions remaining regarding the optimal management of nonresponders. ICANS is an inflammatory neurotoxicity typically occurring after CRS and characterized by impaired blood-brain barrier integrity. Symptoms of encephalopathy range from mild confusion and aphasia to somnolence, obtundation, and in some cases seizures and cerebral edema. ICANS is currently managed with corticosteroids; however, the optimal dose and duration remain to be determined. Little information is available to guide the management of patients with steroid-refractory ICANS. Numerous cytokine-targeted therapies have been proposed to manage these inflammatory toxicities, but few clinical data are available. Management of inflammatory toxicities of chimeric antigen receptor T cells often requires multidisciplinary management and intensive care, during which allergists and immunologists may…
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CRS and ICANS affect approximately 45% to 50% of patients, with severe conditions (grade ≥ 3) occurring in 10% to 12% of patients.
“Two of the most common complications are cytokine release syndrome (CRS) and immune effector cell-associated neurotoxicity syndrome (ICANS), which affect approximately 45% to 50% of patients, with severe conditions (grade ≥ 3) occurring in 10% to 12% of patients.”
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“In addition, tocilizumab was highly effective and widely used for treating CRS and ICANS (17, 27, 37, 38).”
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“69,70 To effectively prevent and manage CRS, various methods can be adopted, including the use of drugs, reducing the dose of CAR-T cells, selecting appropriate patients, and early intervention.”
MethodChen, K., Linares, I. M., Trempel, M. A., Feidler, A. M., De Silva, D., Farajollahi, S., Jones, J., Kuebel, J., Kasap, P., Engelhardt, B., et al. (2025) · Advanced Science · doi:10.1002/advs.202508271 · Cited by 9 · see citing works
Xie, S., Long, J., Wang, R., Xiang, R.-F., Xian, H.-J., Wang, Y.-X., Dou, W., Zhang, W.-J., Li, D., Kang, T., et al. (2025) · Frontiers in Immunology · doi:10.3389/fimmu.2025.1531344 · Cited by 9 · see citing works
“How to avoid severe CRS is another challenge in CAR-T therapy (3, 4).”
Liu, W., Lin, S., Zhu, X., Yin, L., Liu, Q., Lei, S., & Feng, B. (2024) · Frontiers in Immunology · doi:10.3389/fimmu.2024.1433075 · Cited by 8 · see citing works
“For cilta-cel, frequently occurring AEs include CRS (n=158), pyrexia (n=58), and ICANS (n=45).”
BackgroundInfluentialTargeting BCMA to Treat Multiple Myeloma: Updates From the 2021 ASH Annual Meeting
Guo, R., Lu, W., Zhang, Y., Cao, X., Jin, X. K., & Zhao, M. (2022) · Frontiers in Immunology · doi:10.3389/fimmu.2022.839097 · Cited by 11 · see citing works
Janus Kinase Inhibitors and Cell Therapy
Assal, A., & Mapara, M. Y. (2021) · Frontiers in Immunology · doi:10.3389/fimmu.2021.740847 · Cited by 8 · see citing works
“Risk factors suggested for the development of CRS include higher disease burden, higher cell dose infused, lymphodepleting chemotherapy selection, cell product used, a low pre-treatment platelet count, and the CD4/CD8 T cell ratio (16, 17).”
BackgroundYe, X.-S., Ge, M., Tan, M., Wu, Y.-Q., Zhang, H.-Q., & Fu, Z.-X. (2025) · Frontiers in Immunology · doi:10.3389/fimmu.2025.1490491 · Cited by 8 · see citing works
“Currently, the occurrence and severity of CRS are assessed by continuously monitoring patient IL6 levels and the biomarker C-reactive protein (CRP) (18).”
InfluentialUnmet needs and lived experience of patients receiving CAR T-cell therapy
O'Shea, P., Johnson, P. C., El-Jawahri, A., & Leblanc, T. W. (2025) · Leukemia and Lymphoma · doi:10.1080/10428194.2025.2455488 · Cited by 8 · see citing works
Interleukin signaling in the regulation of natural killer cells biology in breast cancer
Xu, J., Gao, H., Azhar, M., Xu, H.-F., Chen, S., Li, M., Ni, X., Yan, T., Zhou, H., Long, Q., et al. (2024) · Frontiers in Immunology · doi:10.3389/fimmu.2024.1449441 · Cited by 8 · see citing works
“In severe instances, these conditions may result in life-threatening attacks by donor cells on the recipient ’ s tissues (7).”
BackgroundOptical sensing and control of T cell signaling pathways
Lee, H. N., Lee, S. E., Inn, K.-S., & Seong, J. (2024) · Frontiers in Physiology · doi:10.3389/fphys.2023.1321996 · Cited by 8
“In addition, side effects such as cytokine release syndrome and neurotoxicity may occur due to the hyperactivation of CAR-T cells (Freyer and Porter, 2020; Siegler and Kenderian, 2020).”
BackgroundThe pathogenesis and development of targeted drugs in acute T lymphoblastic leukaemia
Chen, Z., Xin, Q., Wei, W., & Wu, Y.-J. (2023) · British Journal of Pharmacology · doi:10.1111/bph.16029 · Cited by 8
“…serum IL-2, TNF-α, IFN-γ, IL-8 (CXCL8), IL-10,MCP-1 (CCL2) andMIP-1α (CCL3), and then cytokine release syndrome occurs, which resulted in capillary leak syn- drome, disseminated intravascular coagulation (DIC) and even immune effector cell-related neurotoxicity syndrome (Freyer & Porter, 2020).”
BackgroundSutanto, H., Romadhon, P. Z., Fatmawati, V. R., Waitupu, A., Ansharullah, B. A., Rachma, B., Elisa, E., Pratiwi, L., & Adytia, G. J. (2025) · Hemato · doi:10.3390/hemato6030029 · Cited by 8 · see citing works
Zhang, J., Xie, D.-L., Tang, M., Gong, Q., Huang, X., Li, J., Xu, S.-N., Luo, N., Sun, H.-L., & Tan, F. (2025) · Frontiers in Immunology · doi:10.3389/fimmu.2025.1597512 · Cited by 7
“Despite its impressive clinical ef fi cacy, CAR-T cell therapy is still accompanied with signi fi cant adverse effects, which might restrict its large-scale clinical applications (6, 7).”
Buciuc, A., Tran, S., Weber, M., Padilla, V., Rueda-Lara, M., & Espinel, Z. (2025) · Journal of Clinical Medicine · doi:10.3390/jcm14051451 · Cited by 7 · see citing works
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“In addition, CRS could not be evaluated in this model using NSG mice because CRS has been reported to be caused by cytokines released from macrophages/monocytes stimulated by overactivated CAR-T cells, 38 but NSG mice have defective macrophage/monocyte functions.”
MethodCAR cell design strategies in solid tumors.
Wang, L., Chen, X., Zhang, L., Niu, B.-N., Li, L., Sun, Y., & Yuan, X.-L. (2022) · International Immunopharmacology · doi:10.1016/j.intimp.2022.109345 · Cited by 7 · see citing works
Rizkallah, J., Wehbeh, B. E. D., Wassouf, W., Salameh, E., Joumaa, A., Haddad, F. J., Hamade, L., Charbel, N., Bakri, G. M., Awada, A., et al. (2026) · Frontiers in Immunology · doi:10.3389/fimmu.2026.1800292 · Cited by 6 · see citing works
Zhang, X., Aimaiti, G., Guan, Y., Sha, Y.-Z., Zhou, W., Shen, J.-F., Zhao, B., & Yuan, W.-E. (2026) · Advancement of science · doi:10.1002/advs.202518547 · Cited by 6 · see citing works
Photocontrolled trimethoprim PROTACs targeting the eDHFR protein tag
Sharma, N., Sarkar, S., Ko, T., Edwards, K. J., Pham, J. M., Nguyen, T., Gong, A. Z., Flores, J. I., Trauner, D. H., & Sellmyer, M. A. (2025) · Nature Communications · doi:10.1038/s41467-025-67527-5 · Cited by 8 · see citing works
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“Some studies also suggest that it may cause damage to the blood-brain barrier, allowing in fl ammatory factors and CAR-T cells to enter the central nervous system, thereby potentially increasing the incidence of ICANS (27, 33 – 35).”
Gavriilaki, E., Mallouri, D., Bousiou, Z., Demosthenous, C., Vardi, A., Dolgyras, P., Batsis, I., Stroggyli, E., Karvouni, P., Masmanidou, M., et al. (2023) · Cancers · doi:10.3390/cancers15174253 · Cited by 6 · see citing works
“CRS is the main risk factor for ICANS since most cases occur after the complete resolution of CRS, suggesting a potential mechanistic link [22,39].”
BackgroundSystemic Capillary Leak Syndrome (SCLS) Presentation in Patients Receiving Anti-cancer Treatments
Anipindi, M., Kacarow, J., & Bitetto, D. (2023) · Cureus · doi:10.7759/cureus.38335 · Cited by 6 · see citing works
“CAR-T cell therapy used in treating hematological cancers is also associated with SCLS due to severe cytokine release [44-45].”
BackgroundWang, Y.-L., Zhang, Y., & Xu, J. (2022) · Frontiers in Oncology · doi:10.3389/fonc.2022.902301 · Cited by 6 · see citing works
“Although tocilizumab has no effect on most ICANS, it is highly effective in the management of CRS (5, 9).”
BackgroundInfluentialChen, L., Chen, F., Niu, H., Li, J., Pu, Y., Yang, C., Wang, Y., Huang, R., Li, K., Lei, Y., et al. (2022) · Frontiers in Immunology · doi:10.3389/fimmu.2022.871661 · Cited by 9 · see citing works
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“Interleukin (IL)-6, interferon gamma (IFNγ), and granulocyte-macrophage colony-stimulating factor as well as IL-8, IL-10, monocyte chemoattractant protein-1, and macrophage inflammatory protein-1b all are considered crucial mediators in this response (2, 3).”
BackgroundMolecularly targeted therapy and immunotherapy in leukemias
Cousin, É., Picard, A., Oundjian, M., Tardif, N., Quéméner, A. M., Rio, A.-G., Galibert, M., Gandemer, V., & Mazurier, F. (2026) · Journal of Hematology & Oncology · doi:10.1186/s13045-025-01775-2 · Cited by 4 · see citing works
“CRS is a systemic inflammatory response that often occurs within 1–4 days after the infusion and can progress to multiple organ failure [389].”
Armstrong, A., Tang, Y., Mukherjee, N. Z., Zhang, N., & Huang, G. (2024) · Frontiers in Immunology · doi:10.3389/fimmu.2024.1448201 · Cited by 4 · see citing works
“Similar to septic shock and HLH conditions, cytokine storm has central role in mediating in fl ammation in CRS/ICANS.”
BackgroundInfluentialChen, M., Liu, X.-Y., Peng, N., Zhang, T.-M., Mou, J.-L., He, H.-Z., Wang, Y., Xu, Y.-X., Xing, H., Tang, K., et al. (2023) · Experimental Hematology & Oncology · doi:10.1186/s40164-023-00423-0 · Cited by 5 · see citing works
“The efficacies of DuAb and EDuAb in humans have not yet to be evaluated, and the main issue should be addressed is the risk of CRS occurring in bispecific antibodies and CAR-T therapy, which can develop into fatal multiple organ failure in severe cases [32, 33].”
BackgroundTigu, A.-B., Nistor, M., Gulei, D., Constantinescu, C.-S., Kegyes, D., Cenariu, D., Mureșan, X. M., Munteanu, R. A., Feder, R., Jitaru, C., et al. (2025) · Blood Reviews · doi:10.1016/j.blre.2025.101354 · Cited by 3 · see citing works
- Authors
- Freyer, C. W., & Porter, D. L.
- Affiliations
- Hospital of the University of Pennsylvania (US)
- Venue
- Journal of Allergy and Clinical Immunology
- Publisher
- Elsevier BV
- Published
- 2020-11
- Volume
- 146
- Issue
- 5
- Pages
- 940-948
- ISSN
- 0091-6749 (ISSN-L)
- OpenAlex
- W3047493249
- Cited by
- 216
- References
- 0
- Citations by year
- 2026: 40 · 2025: 63 · 2024: 39 · 2023: 37 · 2022: 23 · 2021: 13 · 2020: 1
- FWCI
- 1.99
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Allergy and Clinical Immunology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Oncology › CAR-T cell therapy research
- Health Sciences › Medicine › Hematology › Autoimmune and Inflammatory Disorders Research
- Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
- Keywords
- cytokine release syndrome, immune effector cell-associated neurotoxicity syndrome, CAR T-cell therapy, hematologic malignancies, capillary leak syndrome, disseminated intravascular coagulation, hemophagocytic lymphohistiocytosis, tocilizumab, corticosteroids, blood-brain barrier integrity, encephalopathy, cytokine-targeted therapy, immunotherapy toxicity management
- MeSH terms
- Cytokine Release Syndrome, Interleukin-6 Inhibitors, Adrenal Cortex Hormones, Humans, Interleukin-6, Immunotherapy, Adoptive, Hematologic Neoplasms, Cancer Vaccines, Neurotoxicity Syndromes, Antibodies, Monoclonal, Humanized, Drug-Related Side Effects and Adverse Reactions
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