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CAR T cell therapies for patients with multiple myeloma
Lekha Mikkilineni1, James N Kochenderfer2
1Surgery Branch, Center for Cancer Research, NCI, NIH, Bethesda, MD, USA. lekha.mikkilineni@mail.nih.gov.
Abstract:
Despite several therapeutic advances over the past decade, multiple myeloma (MM) remains largely incurable, indicating a need for new treatment approaches. Chimeric antigen receptor (CAR) T cell therapy works by mechanisms distinct from those of other MM therapies and involves the modification of patient or donor T cells to target specific cell-surface antigens. B cell maturation antigen (BCMA) is expressed only on plasma cells, a small subset of B cells and MM cells, which makes it a suitable target antigen for such therapies. At the time of writing, data from >20 clinical trials involving anti-BCMA CAR T cells have demonstrated that patients with relapsed and/or refractory MM can achieve objective responses. These early investigations have been instrumental in demonstrating short-term safety and efficacy; however, most patients do not have disease remission lasting >18 months. Attempts to reduce or delay the onset of relapsed disease are underway and include identifying additional CAR T cell target antigens and methods of enhancing BCMA expression on MM cells. Engineering CAR T cells to enhance both the activity and safety of treatment continues to be a promising avenue for improvement. In this Review we summarize data from clinical trials that have been carried out to date, describe novel antigens that could be targeted in the future, and highlight potential future innovations that could enhance the efficacy and/or reduce the toxicities associated with CAR T cell therapies.
Insights
Chimeric antigen receptor (CAR) T cell therapy shows promise for multiple myeloma (MM) by targeting BCMA. Further research aims to improve CAR T cell efficacy and durability for incurable MM.
Area of Science:
- Immunology
- Oncology
- Biotechnology
Background:
- Multiple myeloma (MM) remains largely incurable despite recent therapeutic advancements.
- Chimeric antigen receptor (CAR) T cell therapy offers a novel approach by modifying T cells to target cancer cells.
- B cell maturation antigen (BCMA) is a promising target antigen for CAR T cell therapy in MM due to its selective expression on malignant plasma cells.
Purpose of the Study:
- To review current clinical trial data on anti-BCMA CAR T cell therapy for multiple myeloma.
- To explore novel target antigens for future CAR T cell therapies in MM.
- To highlight innovations aimed at enhancing CAR T cell therapy efficacy and safety.
Main Methods:
- Review of clinical trial data for anti-BCMA CAR T cell therapies.
- Identification and discussion of potential new target antigens.
- Analysis of strategies to improve CAR T cell activity and reduce toxicity.
Main Results:
- Over 20 clinical trials show objective responses in relapsed/refractory MM patients treated with anti-BCMA CAR T cells.
- Current therapies demonstrate short-term safety and efficacy, but remissions often last less than 18 months.
- Ongoing efforts focus on identifying new targets and enhancing BCMA expression to overcome resistance.
Conclusions:
- Anti-BCMA CAR T cell therapy is a viable treatment for relapsed/refractory MM, with ongoing research to improve long-term outcomes.
- Future innovations in CAR T cell engineering and target selection hold potential for enhanced efficacy and reduced toxicity.
- Continued investigation into novel antigens and treatment strategies is crucial for advancing CAR T cell therapy in multiple myeloma.
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