Vaccines Targeting the Tumor Microenvironment: Challenges and Future Prospects

A special issue of Vaccines (ISSN 2076-393X). This special issue belongs to the section "Cancer Vaccines and Immunotherapy".

Deadline for manuscript submissions: 30 November 2024 | Viewed by 4952

Special Issue Editors


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Guest Editor
1. Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15213, USA
2. UPMC Hillman Cancer Center, Pittsburgh, PA 15232, USA
Interests: angiogenesis; cancer immunology; cancer immunotherapy; cancer vaccines; CD8+ T cells; chemokines; dendritic cells; pericytes; tertiary lymphoid structures; tumor microenvironment; vascular endothelial cells

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Guest Editor
Department Immunotherapeutics and Biotechnology, Texas Tech University Health Sciences Center, Abilene, TX 79601, USA
Interests: tumor angiogenesis; cancer immunology; cancer immunotherapy; cancer vaccines; antibodies

Special Issue Information

Dear Colleagues,

Immunotherapies integrating immune checkpoint inhibitors (ICI) represent the current standard of care in the setting of many forms of solid cancer, yet they effectively treat only a minority of patients and are leveraged by the prerequisite for the presence of tumor-reactive T (or B) cells in the patient at baseline. To augment levels of such therapeutic immune effector cells, active vaccination approaches are warranted as priming regimens prior to the administration of ICI or for inclusion in combination intervention protocols to improved patient outcomes. Although cancer vaccines have traditionally targeted tumor cell-associated antigens (including mutated neoantigens), the tumor microenvironment can enforce altered epigenetic programming in its component (non-tumor) stromal cell populations including cancer-associated fibroblasts (CAFs), vascular pericytes/mural cells, and vascular endothelial cells, among others, providing a diverse array of TME-associated antigens capable of being differentially recognized vs. normal tissues by the adaptive immune system. In this Special Issue, we welcome the submission of articles focused on cutting-edge vaccine-based approaches to improve the host response to cancer when applied as monotherapies or in combination with alternate immunotherapies such as ICI, TME conditioning agents, adoptive (T/CAR-T) cell therapies, or others.

Prof. Dr. Walter J. Storkus
Dr. Devin Lowe
Guest Editors

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Keywords

  • vaccine
  • adoptive cell therapy
  • CAR-T cells
  • immune checkpoint inhibitors
  • immunotherapy
  • stroma
  • tumor microenvironment

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Published Papers (3 papers)

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Research

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14 pages, 2709 KiB  
Article
Therapeutic Anti-Tumor Efficacy of DC-Based Vaccines Targeting TME-Associated Antigens Is Improved When Combined with a Chemokine-Modulating Regimen and/or Anti-PD-L1
by Jennifer L. Taylor, Kathleen M. Kokolus, Per H. Basse, Jessica N. Filderman, Chloe E. Cosgrove, Simon C. Watkins, Andrea Gambotto, Devin B. Lowe, Robert P. Edwards, Pawel Kalinski and Walter J. Storkus
Vaccines 2024, 12(7), 777; https://doi.org/10.3390/vaccines12070777 - 15 Jul 2024
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Abstract
We previously reported that dendritic cell (DC)-based vaccines targeting antigens expressed by tumor-associated vascular endothelial cells (VECs) and pericytes effectively control tumor growth in translational mouse tumor models. In the current report, we examined whether the therapeutic benefits of such tumor blood vessel [...] Read more.
We previously reported that dendritic cell (DC)-based vaccines targeting antigens expressed by tumor-associated vascular endothelial cells (VECs) and pericytes effectively control tumor growth in translational mouse tumor models. In the current report, we examined whether the therapeutic benefits of such tumor blood vessel antigen (TBVA)-targeted vaccines could be improved by the cotargeting of tumor antigens in the s.c. B16 melanoma model. We also evaluated whether combination vaccines incorporating anti-PD-L1 checkpoint blockade and/or a chemokine-modulating (CKM; IFNα + TLR3-L [rintatolimod] + Celecoxib) regimen would improve T cell infiltration/functionality in tumors yielding enhanced treatment benefits. We report that DC–peptide or DC–tumor lysate vaccines coordinately targeting melanoma antigens and TBVAs were effective in slowing B16 growth in vivo and extending survival, with superior outcomes observed for DC–peptide-based vaccines. Peptide-based vaccines that selectively target either melanoma antigens or TBVAs elicited a CD8+ T cell repertoire recognizing both tumor cells and tumor-associated VECs and pericytes in vitro, consistent with a treatment-induced epitope spreading mechanism. Notably, combination vaccines including anti-PD-L1 + CKM yielded superior therapeutic effects on tumor growth and animal survival, in association with the potentiation of polyfunctional CD8+ T cell reactivity against both tumor cells and tumor-associated vascular cells and a pro-inflammatory TME. Full article
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15 pages, 3867 KiB  
Article
STAT1-Deficient HPV E6/E7-Associated Cancers Maintain Host Immunocompetency against Therapeutic Intervention
by Ling Lim, Ming-Hung Hu, Darrell Fan, Hsin-Fang Tu, Ya-Chea Tsai, Michelle Cheng, Suyang Wang, Chih-Long Chang, Tzyy-Choou Wu and Chien-Fu Hung
Vaccines 2024, 12(4), 430; https://doi.org/10.3390/vaccines12040430 - 17 Apr 2024
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Abstract
Human papillomavirus (HPV) remains a global health concern because it contributes to the initiation of various HPV-associated cancers such as anal, cervical, oropharyngeal, penile, vaginal, and vulvar cancer. In HPV-associated cancers, oncogenesis begins with an HPV infection, which is linked to the activation [...] Read more.
Human papillomavirus (HPV) remains a global health concern because it contributes to the initiation of various HPV-associated cancers such as anal, cervical, oropharyngeal, penile, vaginal, and vulvar cancer. In HPV-associated cancers, oncogenesis begins with an HPV infection, which is linked to the activation of the Janus protein tyrosine kinase (JAK)/STAT signaling pathway. Various STAT signaling pathways, such as STAT3 activation, have been well documented for their tumorigenic role, yet the role of STAT1 in tumor formation remains unclear. In the current study, STAT1−/− mice were used to investigate the role of STAT1 in the tumorigenesis of a spontaneous HPV E6/E7-expressing oral tumor model. Subsequently, our candidate HPV DNA vaccine CRT/E7 was administered to determine whether the STAT1−/− host preserves a therapeutic-responsive tumor microenvironment. The results indicated that STAT1−/− induces robust tumorigenesis, yet a controlled tumor response was attained upon CRT/E7 vaccination. Characterizing this treatment effect, immunological analysis found a higher percentage of circulating CD4+ and CD8+ T cells and tumor-specific cytotoxic T cells. In addition, a reduction in exhaustive lymphocyte activity was observed. Further analysis of a whole-cell tumor challenge affirmed these findings, as spontaneous tumor growth was more rapid in STAT1−/− mice. In conclusion, STAT1 deletion accelerates tumorigenesis, but STAT1−/− mice maintains immunocompetency in CRT/E7 treatments. Full article
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Review

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15 pages, 620 KiB  
Review
Lessons from Post-Immunotherapy Tumor Tissues in Clinical Trials: How Can We Fuel the Tumor Microenvironment in Gliomas?
by Lan Hoc Phung, Takahide Nejo and Hideho Okada
Vaccines 2024, 12(8), 862; https://doi.org/10.3390/vaccines12080862 - 1 Aug 2024
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Abstract
Despite recent advancements in cancer immunotherapy, many patients with gliomas and glioblastomas have yet to experience substantial therapeutic benefits. Modulating the tumor microenvironment (TME) of gliomas, which is typically “cold”, is crucial for improving treatment outcomes. Clinical tumor specimens obtained post-immunotherapy provide invaluable [...] Read more.
Despite recent advancements in cancer immunotherapy, many patients with gliomas and glioblastomas have yet to experience substantial therapeutic benefits. Modulating the tumor microenvironment (TME) of gliomas, which is typically “cold”, is crucial for improving treatment outcomes. Clinical tumor specimens obtained post-immunotherapy provide invaluable insights. However, access to such post-immunotherapy samples remains limited, even in clinical trials, as tumor tissues are often collected only at tumor relapse. Recent studies of neoadjuvant immunotherapy provided important insights by incorporating surgical resections of post-treatment tumors. Moreover, pre-surgical immunotherapies are increasingly integrated into clinical trial designs to evaluate treatment efficacy. These investigations reveal critical information, particularly regarding the delivery success of therapeutic agents, the expansion and persistence of immune products, and the cellular and molecular changes induced in the TME. In this review, we assess the findings on post-treatment tumor specimens obtained from recent immunotherapy clinical trials on gliomas, highlight the importance of these samples for understanding therapeutic impacts, and discuss proactive investigation approaches for future clinical trials. Full article
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