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Updated: Feb 6, 2026

Generation of Human Chimeric Antigen Receptor Regulatory T Cells
Published on: January 3, 2025
Immune Cell Hacking: Challenges and Clinical Approaches to Create Smarter Generations of Chimeric Antigen Receptor T
Reza Elahi1, Elnaz Khosh1, Safa Tahmasebi2
1School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran.
Abstract:
T cells equipped with chimeric antigen receptors (CAR T cells) have recently provided promising advances as a novel immunotherapeutic approach for cancer treatment. CAR T cell therapy has shown stunning results especially in B-cell malignancies; however, it has shown less success against solid tumors, which is more supposed to be related to the specific characteristics of the tumor microenvironment. In this review, we discuss the structure of the CAR, current clinical advantages from finished and ongoing trials, adverse effects, challenges and controversies, new engineering methods of CAR, and clinical considerations that are associated with CAR T cell therapy both in hematological malignancies and solid tumors. Also, we provide a comprehensive description of recently introduced modifications for designing smarter models of CAR T cells. Specific hurdles and problems that limit the optimal function of CAR T cells, especially on solid tumors, and possible solutions according to new modifications and generations of CAR T cells have been introduced here. We also provide information of the future directions on how to enhance engineering the next smarter generations of CAR T cells in order to decrease the adverse effects and increase the potency and efficacy of CAR T cells against cancer.
Insights
Chimeric antigen receptor (CAR) T cell therapy shows promise for blood cancers but faces challenges with solid tumors. This review explores CAR T cell advancements, engineering, and future directions to improve efficacy and reduce side effects.
Area of Science:
- Immunotherapy
- Oncology
- Cellular Therapy
Background:
- Chimeric antigen receptor (CAR) T cell therapy represents a significant advancement in cancer treatment, particularly for B-cell malignancies.
- However, its efficacy against solid tumors is limited due to the complex tumor microenvironment.
- This review synthesizes current knowledge on CAR T cell therapy, addressing its applications, challenges, and future potential.
Purpose of the Study:
- To review the structure, clinical applications, and adverse effects of CAR T cell therapy.
- To discuss challenges and controversies associated with CAR T cell therapy in both hematological and solid tumors.
- To explore novel engineering methods and future directions for developing next-generation CAR T cells.
Main Methods:
- Comprehensive literature review of finished and ongoing clinical trials.
- Analysis of current engineering strategies and modifications for CAR T cells.
- Discussion of challenges specific to solid tumors and proposed solutions.
Main Results:
- CAR T cell therapy has demonstrated remarkable success in hematological malignancies.
- Significant hurdles remain for solid tumor treatment, including tumor microenvironment interactions.
- Recent engineering advancements aim to create 'smarter' CAR T cells with enhanced potency and safety.
Conclusions:
- CAR T cell therapy holds immense potential but requires further optimization for broader application, especially against solid tumors.
- Future research should focus on innovative engineering approaches to overcome current limitations and improve therapeutic outcomes.
- Developing next-generation CAR T cells is crucial for enhancing efficacy and minimizing adverse effects in cancer treatment.
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