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Immunologic Response to a CCL21-Gene Modified Dendritic Cell Vaccine in Non-Small Cell Lung Cancer
Immunologic Response to a CCL21-Gene Modified Dendritic Cell Vaccine in Non-Small Cell Lung Cancer
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104707
- ISBN
- 9798286432806
- DDC
- 616.99
- 서명/저자
- Immunologic Response to a CCL21-Gene Modified Dendritic Cell Vaccine in Non-Small Cell Lung Cancer
- 발행사항
- [Sl] : University of California, Los Angeles, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 138 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
- 주기사항
- Advisor: Dubinett, Steven M.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Los Angeles, 2025.
- 초록/해제
- 요약Non-small cell lung cancer (NSCLC) remains a leading cause of cancer mortality, despite recent advances in immune checkpoint inhibitor (ICI) therapy. ICIs have reshaped the therapeutic paradigm for NSCLC by offering durable clinical benefit in a subset of patients, but a substantial portion of patients fail to respond or develop tumor resistance. Immune escape mechanisms include impaired presentation of tumor antigens, limited T cell infiltration into the tumor, and immunosuppressive signals in the tumor microenvironment (TME). One potential strategy to overcome these factors involves improving the activity of antigen-presenting cells (APCs), such as dendritic cells (DCs), that are able to present tumor antigens and initiate tumor-specific T cell activation. DCs can be administered as an in situ vaccine to bolster APC functions in the TME, and they can be further engineered to express chemokines such as CCL21 in order to promote T cell trafficking into the tumor.In this context, we completed a phase I clinical trial combining an autologous CCL21-gene modified dendritic cell (CCL21-DC) vaccine with pembrolizumab in patients with advanced stage NSCLC with the goal of overcoming resistance in ICI-refractory disease. There were no objective responses observed in this trial, but there was a 36.8% rate of disease control, including a case of disease stability lasting over 1 year as well as a case with post-vaccine resolution of an intracranial metastatic lesion. To better understand the immunologic impact of the trial therapy, we first performed a comprehensive characterization of the CCL21-DC vaccine product, which revealed significant cellular heterogeneity and variable CCL21 secretion. These findings suggested limitations to the DC vaccine manufacturing process that may adversely affect the consistency of therapeutic response. We next performed immune monitoring studies using longitudinal tumor biopsies and peripheral blood samples from patients on the clinical trial. We found that the CCL21-DC vaccine plus pembrolizumab reduced mutational intratumor heterogeneity (ITH) in patients who experienced disease control, indicative of active tumor immunoediting. The therapy also induced an increase in tumor infiltration by T cells and in particular early memory CD4+ T cells capable of migrating along a CCL21 gradient. Tumor samples with disease control exhibited greater T cell receptor (TCR) repertoire diversity and increased expansion of novel intratumoral clones. The immunologic changes within the tumor, however, were not consistently reflected in systemic immune signatures and were often transient in nature. Finally, in anticipation of further mechanistic studies of the CCL21-DC vaccine, we developed a murine NSCLC model consisting of clonal cell lines that can be used to modulate ITH and track clonal dynamics in response to immunotherapies.Our findings overall suggest that the CCL21-DC vaccine can promote T cell infiltration and clonal diversification in the tumor, but there were limitations to the durability and depth of the resulting immunologic response. These results support further investigation of DC vaccine design and application as a strategy to enhance immunotherapy efficacy in NSCLC.
- 일반주제명
- Oncology
- 일반주제명
- Immunology
- 일반주제명
- Cellular biology
- 키워드
- CCL21
- 키워드
- Dendritic cells
- 기타저자
- University of California, Los Angeles Molecular Biology 0573
- 기본자료저록
- Dissertations Abstracts International. 86-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798286432806
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a616.99
■1001 ▼aOh, Michael Saeyoung.
■24510▼aImmunologic Response to a CCL21-Gene Modified Dendritic Cell Vaccine in Non-Small Cell Lung Cancer
■260 ▼a[Sl]▼bUniversity of California, Los Angeles▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a138 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-12, Section: B.
■500 ▼aAdvisor: Dubinett, Steven M.
■5021 ▼aThesis (Ph.D.)--University of California, Los Angeles, 2025.
■520 ▼aNon-small cell lung cancer (NSCLC) remains a leading cause of cancer mortality, despite recent advances in immune checkpoint inhibitor (ICI) therapy. ICIs have reshaped the therapeutic paradigm for NSCLC by offering durable clinical benefit in a subset of patients, but a substantial portion of patients fail to respond or develop tumor resistance. Immune escape mechanisms include impaired presentation of tumor antigens, limited T cell infiltration into the tumor, and immunosuppressive signals in the tumor microenvironment (TME). One potential strategy to overcome these factors involves improving the activity of antigen-presenting cells (APCs), such as dendritic cells (DCs), that are able to present tumor antigens and initiate tumor-specific T cell activation. DCs can be administered as an in situ vaccine to bolster APC functions in the TME, and they can be further engineered to express chemokines such as CCL21 in order to promote T cell trafficking into the tumor.In this context, we completed a phase I clinical trial combining an autologous CCL21-gene modified dendritic cell (CCL21-DC) vaccine with pembrolizumab in patients with advanced stage NSCLC with the goal of overcoming resistance in ICI-refractory disease. There were no objective responses observed in this trial, but there was a 36.8% rate of disease control, including a case of disease stability lasting over 1 year as well as a case with post-vaccine resolution of an intracranial metastatic lesion. To better understand the immunologic impact of the trial therapy, we first performed a comprehensive characterization of the CCL21-DC vaccine product, which revealed significant cellular heterogeneity and variable CCL21 secretion. These findings suggested limitations to the DC vaccine manufacturing process that may adversely affect the consistency of therapeutic response. We next performed immune monitoring studies using longitudinal tumor biopsies and peripheral blood samples from patients on the clinical trial. We found that the CCL21-DC vaccine plus pembrolizumab reduced mutational intratumor heterogeneity (ITH) in patients who experienced disease control, indicative of active tumor immunoediting. The therapy also induced an increase in tumor infiltration by T cells and in particular early memory CD4+ T cells capable of migrating along a CCL21 gradient. Tumor samples with disease control exhibited greater T cell receptor (TCR) repertoire diversity and increased expansion of novel intratumoral clones. The immunologic changes within the tumor, however, were not consistently reflected in systemic immune signatures and were often transient in nature. Finally, in anticipation of further mechanistic studies of the CCL21-DC vaccine, we developed a murine NSCLC model consisting of clonal cell lines that can be used to modulate ITH and track clonal dynamics in response to immunotherapies.Our findings overall suggest that the CCL21-DC vaccine can promote T cell infiltration and clonal diversification in the tumor, but there were limitations to the durability and depth of the resulting immunologic response. These results support further investigation of DC vaccine design and application as a strategy to enhance immunotherapy efficacy in NSCLC.
■590 ▼aSchool code: 0031.
■650 4▼aOncology
■650 4▼aImmunology
■650 4▼aCellular biology
■653 ▼aCCL21
■653 ▼aDendritic cells
■653 ▼aImmune checkpoint inhibitors
■653 ▼aTumor microenvironment
■690 ▼a0992
■690 ▼a0982
■690 ▼a0379
■71020▼aUniversity of California, Los Angeles▼bMolecular Biology 0573.
■7730 ▼tDissertations Abstracts International▼g86-12B.
■790 ▼a0031
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358471▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


