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Sharma P, Pachynski RK, Narayan V, Fléchon A, Gravis G, Galsky MD, Mahammedi H, Patnaik A, Subudhi SK, Ciprotti M, Simsek B, Saci A, Hu Y, Han GC, Fizazi K. Nivolumab Plus Ipilimumab for Metastatic Castration-Resistant Prostate Cancer: Preliminary Analysis of Patients in the CheckMate 650 Trial. Cancer Cell 2020; 38:489-499.e3. [PMID: 32916128 DOI: 10.1016/j.ccell.2020.08.007] [Citation(s) in RCA: 200] [Impact Index Per Article: 50.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 07/14/2020] [Accepted: 08/13/2020] [Indexed: 12/13/2022]
Abstract
Metastatic castration-resistant prostate cancer (mCRPC) is immunologically "cold" and predominantly resistant to immune checkpoint therapy due to few tumor-infiltrating T cells. Ipilimumab (anti-CTLA-4) or anti-PD-1/PD-L1 monotherapy failed to show a significant benefit. Although the PD-1/PD-L1 pathway is minimally expressed in prostate tumors, we previously demonstrated that PD-1/PD-L1 expression increases as a compensatory inhibitory pathway in parallel with an ipilimumab-induced increase in tumor-infiltrating T cells. Here, we report the largest trial to date in mCRPC with anti-CTLA-4 plus anti-PD-1 (nivolumab 1 mg/kg plus ipilimumab 3 mg/kg; CheckMate 650, NCT02985957). With median follow-ups of 11.9 and 13.5 months in cohorts 1 (pre-chemotherapy; n = 45) and 2 (post-chemotherapy; n = 45), objective response rate was 25% and 10%, and median overall survival was 19.0 and 15.2 months, respectively. Four patients, two in each cohort, had complete responses. Exploratory studies identify potential biomarkers of response. Grade 3-4 treatment-related adverse events have occurred in ∼42%-53% of patients, with four treatment-related deaths. Therefore, dose/schedule modifications have been implemented.
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Affiliation(s)
- Padmanee Sharma
- Department of Genitourinary Medical Oncology, MD Anderson Cancer Center, University of Texas, Unit 1374, 1155 Pressler Street, Houston, TX 77030, USA.
| | - Russell K Pachynski
- Division of Oncology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Vivek Narayan
- Abramson Cancer Center, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Aude Fléchon
- Department of Medical Oncology, Centre Léon Bérard, 69008 Lyon, France
| | - Gwenaelle Gravis
- Department of Medical Oncology, Institut Paoli-Calmettes Aix-Marseille Université, 13009 Marseille, France
| | - Matthew D Galsky
- Division of Hematology and Medical Oncology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Hakim Mahammedi
- Department of Medical Oncology, Centre Jean Perrin, 63011 Clermont-Ferrand, France
| | - Akash Patnaik
- Department of Medical Oncology, The University of Chicago Medicine, Chicago, IL 60637, USA
| | - Sumit K Subudhi
- Department of Genitourinary Medical Oncology, MD Anderson Cancer Center, University of Texas, Unit 1374, 1155 Pressler Street, Houston, TX 77030, USA
| | | | | | - Abdel Saci
- Bristol Myers Squibb, Princeton, NJ 08540, USA
| | - Yanhua Hu
- Bristol Myers Squibb, Princeton, NJ 08540, USA
| | | | - Karim Fizazi
- Department of Cancer Medicine, Gustave Roussy, University of Paris Saclay, 94800 Villejuif, France
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Märklin M, Hagelstein I, Koerner SP, Rothfelder K, Pfluegler MS, Schumacher A, Grosse-Hovest L, Jung G, Salih HR. Bispecific NKG2D-CD3 and NKG2D-CD16 fusion proteins for induction of NK and T cell reactivity against acute myeloid leukemia. J Immunother Cancer 2019; 7:143. [PMID: 31142382 PMCID: PMC6542021 DOI: 10.1186/s40425-019-0606-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 04/26/2019] [Indexed: 12/18/2022] Open
Abstract
Background Monoclonal antibodies (mAbs) mediate their effects in great part by inducing ADCC of NK cells, and multiple efforts aim to increase this function by engineering mAbs optimized Fc-parts. Even more potent antitumor immunity can be induced by strategies to stimulate T cells with their profoundly higher effector potential. However, upon increased immunostimulatory potential, the necessity to target highly tumor-specific antigens becomes critically important to reduce side effects. Methods We here report on bispecific fusion proteins (BFP) that target ligands of the immunoreceptor NKG2D (NKG2DL), which are widely expressed on malignant cells but generally absent on healthy tissue. They consist of the extracellular domain of NKG2D as targeting moiety fused to Fab-fragments of CD3 (NKG2D-CD3) or CD16 (NKG2D-CD16) antibodies. Results NKG2D-CD16 displayed increased affinity to the FcγRIII on NK cells compared to engineered Fc-parts, which are contained in optimized mAbs that presently undergo clinical evaluation. In line, NKG2D-CD16 induced superior activation, degranulation, IFN-γ production and lysis of acute myeloid leukemia (AML) cell lines and patient AML cells. NKG2D-CD3 in turn potently stimulated T cells, and comparison of efficacy over time revealed that NKG2D-CD16 was superior upon short term application, while NKG2D-CD3 mediated overall more potent effects which manifested after longer times. This can be attributed to treatment-induced proliferation of T cells but not NK cells. Conclusions Taken together, we here introduce novel “antibody-like” BFP that take advantage of the highly tumor-restricted expression of NKG2DL and potently activate the reactivity of NK cells or T cells for immunotherapy of AML. Electronic supplementary material The online version of this article (10.1186/s40425-019-0606-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Melanie Märklin
- Clinical Collaboration Unit Translational Immunology, German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Partner site Tuebingen, Otfried-Mueller-Str. 10, 72076, Tuebingen, Germany
| | - Ilona Hagelstein
- Clinical Collaboration Unit Translational Immunology, German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Partner site Tuebingen, Otfried-Mueller-Str. 10, 72076, Tuebingen, Germany
| | - Samuel P Koerner
- Clinical Collaboration Unit Translational Immunology, German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Partner site Tuebingen, Otfried-Mueller-Str. 10, 72076, Tuebingen, Germany
| | - Kathrin Rothfelder
- Clinical Collaboration Unit Translational Immunology, German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Partner site Tuebingen, Otfried-Mueller-Str. 10, 72076, Tuebingen, Germany
| | - Martin S Pfluegler
- Clinical Collaboration Unit Translational Immunology, German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Partner site Tuebingen, Otfried-Mueller-Str. 10, 72076, Tuebingen, Germany
| | - Andreas Schumacher
- Clinical Collaboration Unit Translational Immunology, German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Partner site Tuebingen, Otfried-Mueller-Str. 10, 72076, Tuebingen, Germany
| | | | - Gundram Jung
- Department for Immunology, Eberhard Karls University, Tuebingen, Germany
| | - Helmut R Salih
- Clinical Collaboration Unit Translational Immunology, German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Partner site Tuebingen, Otfried-Mueller-Str. 10, 72076, Tuebingen, Germany.
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Alaia C, Boccellino M, Zappavigna S, Amler E, Quagliuolo L, Rossetti S, Facchini G, Caraglia M. Ipilimumab for the treatment of metastatic prostate cancer. Expert Opin Biol Ther 2017; 18:205-213. [PMID: 29271259 DOI: 10.1080/14712598.2018.1420777] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
INTRODUCTION Immunotherapy with checkpoint inhibitors is beginning to be recognized as a valid weapon for the treatment of metastatic prostate cancer (PCa) when chemotherapy fails. Ipilimumab (ipi) is a fully humanized monoclonal antibody that blocks the activity of CTLA4. It also has a molecular weight of 148 kDa and is water-soluble at physiological pH. Ipi was first approved by the FDA for the treatment of malignant melanoma and is currently being studied in metastatic castration-resistant prostate cancer, with promising early results. Areas covered: The aim of this review is to collate the most significant preclinical and clinical studies available that look at ipi to propose new strategies for the future. Expert opinion: Additional studies are required to reduce toxicity and increase the activity of ipi in PCa. A possible strategy is to combine ipi with standard anti-cancer therapeutics such as vaccines, PDL1 inhibitors, antiandrogen drugs, and chemotherapy agents. Several initial results have suggested that combination strategies are useful to increase the activity in mCRPC, even if the toxicity of the treatment can increase. The activity of combined treatments is still not predictable, but considering the ongoing studies, we believe that they have good potential that will lead to the discovery of an optimal therapeutic strategy.
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Affiliation(s)
- Concetta Alaia
- a Department of Biochemistry, Biophysics and General Pathology , University of Campania "L. Vanvitelli" , Naples , Italy
| | - Mariarosaria Boccellino
- a Department of Biochemistry, Biophysics and General Pathology , University of Campania "L. Vanvitelli" , Naples , Italy
| | - Silvia Zappavigna
- a Department of Biochemistry, Biophysics and General Pathology , University of Campania "L. Vanvitelli" , Naples , Italy
| | - Evzen Amler
- b Department of Biophysics, 2nd Faculty of Medicine , Charles University Prague , Prague , Czech Republic.,c Laboratory of Tissue Engineering, Institute of Experimental Medicine , Academy of Sciences of the Czech Republic , Prague , Czech Republic
| | - Lucio Quagliuolo
- a Department of Biochemistry, Biophysics and General Pathology , University of Campania "L. Vanvitelli" , Naples , Italy
| | - Sabrina Rossetti
- d Division of Medical Oncology, Department of Uro-Gynaecological Oncology , Istituto Nazionale Tumori IRCCS "Fondazione G. Pascale" , Napoli , Italy.,e Progetto ONCONET2.0 - Linea progettuale 14 per l'implementazione della prevenzione e diagnosi precoce del tumore alla prostata e testicolo, Uro-Gynaechological Department of the National Institute of Tumours "G. Pascale", Regione Campania , Naples , Italy
| | - Gaetano Facchini
- d Division of Medical Oncology, Department of Uro-Gynaecological Oncology , Istituto Nazionale Tumori IRCCS "Fondazione G. Pascale" , Napoli , Italy
| | - Michele Caraglia
- a Department of Biochemistry, Biophysics and General Pathology , University of Campania "L. Vanvitelli" , Naples , Italy
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Cattrini C, Zanardi E, Vallome G, Cavo A, Cerbone L, Di Meglio A, Fabbroni C, Latocca MM, Rizzo F, Messina C, Rubagotti A, Barboro P, Boccardo F. Targeting androgen-independent pathways: new chances for patients with prostate cancer? Crit Rev Oncol Hematol 2017; 118:42-53. [PMID: 28917268 DOI: 10.1016/j.critrevonc.2017.08.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 08/21/2017] [Accepted: 08/21/2017] [Indexed: 02/08/2023] Open
Abstract
Androgen deprivation therapy (ADT) is the mainstay treatment for advanced prostate cancer (PC). Most patients eventually progress to a condition known as castration-resistant prostate cancer (CRPC), characterized by lack of response to ADT. Although new androgen receptor signaling (ARS) inhibitors and chemotherapeutic agents have been introduced to overcome resistance to ADT, many patients progress because of primary or acquired resistance to these agents. This comprehensive review aims at exploring the mechanisms of resistance and progression of PC, with specific focus on alterations which lead to the activation of androgen receptor (AR)-independent pathways of survival. Our work integrates available clinical and preclinical data on agents which target these pathways, assessing their potential clinical implication in specific settings of patients. Given the rising interest of the scientific community in cancer immunotherapy strategies, further attention is dedicated to the role of immune evasion in PC.
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Affiliation(s)
- C Cattrini
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy; Department of Internal Medicine and Medical Specialties (DIMI), School of Medicine, University of Genoa, V.le Benedetto XV 6, 16132, Genoa, Italy.
| | - E Zanardi
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy; Department of Internal Medicine and Medical Specialties (DIMI), School of Medicine, University of Genoa, V.le Benedetto XV 6, 16132, Genoa, Italy
| | - G Vallome
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy; Department of Internal Medicine and Medical Specialties (DIMI), School of Medicine, University of Genoa, V.le Benedetto XV 6, 16132, Genoa, Italy
| | - A Cavo
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy; Department of Internal Medicine and Medical Specialties (DIMI), School of Medicine, University of Genoa, V.le Benedetto XV 6, 16132, Genoa, Italy
| | - L Cerbone
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy; Department of Internal Medicine and Medical Specialties (DIMI), School of Medicine, University of Genoa, V.le Benedetto XV 6, 16132, Genoa, Italy
| | - A Di Meglio
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy; Department of Internal Medicine and Medical Specialties (DIMI), School of Medicine, University of Genoa, V.le Benedetto XV 6, 16132, Genoa, Italy
| | - C Fabbroni
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy; Department of Internal Medicine and Medical Specialties (DIMI), School of Medicine, University of Genoa, V.le Benedetto XV 6, 16132, Genoa, Italy
| | - M M Latocca
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy; Department of Internal Medicine and Medical Specialties (DIMI), School of Medicine, University of Genoa, V.le Benedetto XV 6, 16132, Genoa, Italy
| | - F Rizzo
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy; Department of Internal Medicine and Medical Specialties (DIMI), School of Medicine, University of Genoa, V.le Benedetto XV 6, 16132, Genoa, Italy
| | - C Messina
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy; Department of Internal Medicine and Medical Specialties (DIMI), School of Medicine, University of Genoa, V.le Benedetto XV 6, 16132, Genoa, Italy
| | - A Rubagotti
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy; Department of Health Sciences (DISSAL), University of Genoa, Via A. Pastore 1, 16132, Genoa, Italy
| | - P Barboro
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy
| | - F Boccardo
- Academic Unit of Medical Oncology, San Martino University Hospital - IST National Cancer Research Institute, L.go R. Benzi 10, 16132, Genoa, Italy; Department of Internal Medicine and Medical Specialties (DIMI), School of Medicine, University of Genoa, V.le Benedetto XV 6, 16132, Genoa, Italy
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Caballero I, Aira LE, Lavastida A, Popa X, Rivero J, González J, Mesa M, González N, Coba K, Lorenzo-Luaces P, Wilkinson B, Santiesteban Y, Santiesteban Y, Troche M, Suarez E, Crombet T, Sánchez B, Casacó A, Macías A, Mazorra Z. Safety and Immunogenicity of a Human Epidermal Growth Factor Receptor 1 (HER1)-Based Vaccine in Prostate Castration-Resistant Carcinoma Patients: A Dose-Escalation Phase I Study Trial. Front Pharmacol 2017; 8:263. [PMID: 28539888 PMCID: PMC5423955 DOI: 10.3389/fphar.2017.00263] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 04/26/2017] [Indexed: 12/13/2022] Open
Abstract
Metastatic castration-resistant prostate cancer (CRPC) remains incurable due to the lack of effective therapies. Activation of the human epidermal growth factor receptor 1 (HER1) in prostate cancer contributes to metastatic progression as well as to disease relapse. Here, we determined the toxicity and immunogenicity of a HER1-based cancer vaccine in CRPC patients included in a phase I clinical trial. CRPC patients (n = 24) were intramuscularly vaccinated with HER1 vaccine consisting of the extracellular domain of HER1 molecule (ECD) and very small size proteoliposome from Neisseria meningitidis (VSSP) and Montanide ISA-51 VG as adjuvants. Patients were included in five groups according to the vaccine dose (100, 200, 400, 600, and 800 μg). The primary endpoints were safety and immunogenicity. The anti-HER1 antibodies were measured by an ELISA, the recognition of an HER1 positive tumor cell line and the inhibition of HER1 phosphorylation by sera were determined by flow cytometry and western blot analysis, respectively. The HER1-specific T cell response was assessed by determination of IFN-γ-producing T cells using ELISpot assay. The vaccine was well tolerated. No grade III or IV adverse events were reported. High titers of anti-HER1 antibodies were observed in most of the evaluated patients. There were no significant differences regarding the geometric means of the anti-HER1 titers among the dose groups except the group of 100 μg in which antibody titers were significantly lower. A Th1-type IgG subclasses pattern was predominant in most patients. Only patients receiving the higher doses of vaccine showed significant tumor cell recognition and HER1 phosphorylation inhibition by hyperimmune sera. Forty two percent of the patients showed a specific T cell response against HER1 peptides pool in post-treatment samples. There was a trend toward survival benefit in those patients showing high anti-HER1 specific antibody titers and a significant association between cellular immune response and clinical outcome.
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Affiliation(s)
- Iraida Caballero
- Department of Oncology, Hermanos Ameijeiras HospitalHavana, Cuba
| | - Lazaro E Aira
- Department of Clinical Immunology, Center of Molecular ImmunologyHavana, Cuba
| | - Anabel Lavastida
- Department of Clinical Immunology, Center of Molecular ImmunologyHavana, Cuba
| | - Xitlally Popa
- Department of Clinical Immunology, Center of Molecular ImmunologyHavana, Cuba
| | | | - Joaquín González
- Department of Oncology, Hermanos Ameijeiras HospitalHavana, Cuba
| | - Mónica Mesa
- Tumor Immunology Direction, Center of Molecular ImmunologyHavana, Cuba
| | - Narjara González
- Tumor Immunology Direction, Center of Molecular ImmunologyHavana, Cuba
| | - Kelly Coba
- Faculty of Medicine "Victoria de Girón"Havana, Cuba
| | | | - Barbara Wilkinson
- Clinical Trials Direction, Center of Molecular ImmunologyHavana, Cuba
| | | | | | - Mayelin Troche
- Clinical Trials Direction, Center of Molecular ImmunologyHavana, Cuba
| | - Eduardo Suarez
- Department of Innovation, Center of Molecular ImmunologyHavana, Cuba
| | - Tania Crombet
- Clinical Trials Direction, Center of Molecular ImmunologyHavana, Cuba
| | - Belinda Sánchez
- Tumor Immunology Direction, Center of Molecular ImmunologyHavana, Cuba
| | - Angel Casacó
- Clinical Trials Direction, Center of Molecular ImmunologyHavana, Cuba
| | - Amparo Macías
- Clinical Trials Direction, Center of Molecular ImmunologyHavana, Cuba
| | - Zaima Mazorra
- Department of Clinical Immunology, Center of Molecular ImmunologyHavana, Cuba
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Noguchi M, Koga N, Moriya F, Itoh K. Immunotherapy in prostate cancer: challenges and opportunities. Immunotherapy 2016; 8:69-77. [DOI: 10.2217/imt.15.101] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Although treatment options for castration-resistant prostate cancer (CRPC) have increased over the last decade, there remains a need for strategies that can provide durable disease control and long-term benefit. Recently, immunotherapy has emerged as a viable and attractive strategy for the treatment of CRPC. To date, there are multiple strategies to target the immune system, and several approaches including therapeutic cancer vaccines and immune checkpoint inhibitors have been most successful in clinical trials. With regard to this, we report the results of the most recent clinical trials investigating immunotherapy in CRPC and discuss the future development of immunotherapy for CRPC, as well as the potential importance of biomarkers in the future progress of this field.
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Affiliation(s)
- Masanori Noguchi
- Division of Clinical Research, Research Center for Innovative Cancer Therapy, Kurume University School of Medicine, 67 Asahi-machi, Kurume 830-0011, Japan
- Cancer Vaccine Center, Kurume University School of Medicine, Kurume, Japan
| | - Noriko Koga
- Division of Clinical Research, Research Center for Innovative Cancer Therapy, Kurume University School of Medicine, 67 Asahi-machi, Kurume 830-0011, Japan
| | - Fukuko Moriya
- Department of Pathology, Kurume University School of Medicine, Kurume, Japan
| | - Kyogo Itoh
- Cancer Vaccine Center, Kurume University School of Medicine, Kurume, Japan
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Current and Emerging Immunotherapies for Castration-resistant Prostate Cancer. Urology 2015; 85:976-986. [DOI: 10.1016/j.urology.2014.12.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 12/16/2014] [Accepted: 12/19/2014] [Indexed: 11/17/2022]
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Klyushnenkova EN, Riabov VB, Kouiavskaia DV, Wietsma A, Zhan M, Alexander RB. Breaking immune tolerance by targeting CD25+ regulatory T cells is essential for the anti-tumor effect of the CTLA-4 blockade in an HLA-DR transgenic mouse model of prostate cancer. Prostate 2014; 74:1423-32. [PMID: 25111463 DOI: 10.1002/pros.22858] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Accepted: 06/17/2014] [Indexed: 11/11/2022]
Abstract
INTRODUCTION Recent studies suggest that the cancer immunotherapy based on the blockade of the CTLA-4-mediated inhibitory pathway is efficacious only in select populations, predominantly for immunogenic tumors or when delivered in combination with modalities that can break immunologic tolerance to tumor antigens. METHODS We studied the effect of CD25+ cell depletion and CTLA-4 blockade on the growth of Transgenic Mouse Adenocarcinoma of Prostate (TRAMP)-PSA tumor cells in DR2bxPSA F1 mice. In these mice, immunological tolerance to PSA was established in a context of the HLA-DRB1*1501(DR2b) allele. RESULTS In our model, single administration of anti-CD25 antibody prior to tumor inoculation significantly increased IFN-γ production in response to the CD8 T cell epitope PSA65-73 , and delayed TRAMP-PSA tumor growth compared to mice treated with isotype control antibodies. In contrast, the anti-tumor effect of the anti-CTLA-4 antibody as a monotherapy was marginal. The combinatory treatment with anti-CD25/anti-CTLA-4 antibodies significantly enhanced anti-tumor immunity and caused more profound delay in tumor growth compared to each treatment alone. The proportion of tumor-free animals was higher in the group that received combination treatment (21%) compared to other groups (2-7%). The enhanced anti-tumor immunity in response to the CD25 depletion or CTLA-4 blockade was only seen in the immunogenic TRAMP-PSA tumor model, whereas the effect was completely absent in mice bearing poorly immunogenic TRAMP-C1 tumors. DISCUSSION Our data suggest that breaking immunological tolerance to "self" antigens is essential for the therapeutic effect of CTLA-4 blockade. Such combinatory treatment may be a promising approach for prostate cancer immunotherapy.
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Affiliation(s)
- Elena N Klyushnenkova
- Department of Surgery, Division of Urology, University of Maryland, Baltimore, Maryland; VA Maryland Health Care System, Baltimore, Maryland
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Cereda V, Formica V, Massimiani G, Tosetto L, Roselli M. Targeting metastatic castration-resistant prostate cancer: mechanisms of progression and novel early therapeutic approaches. Expert Opin Investig Drugs 2014; 23:469-87. [PMID: 24490883 DOI: 10.1517/13543784.2014.885950] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
INTRODUCTION Advances in clinical research have led to official approval of several new treatments for metastatic prostate cancer in the last three years: sipuleucel-T, cabazitaxel, abiraterone acetate, radium-223 and enzalutamide. Although these agents have all been shown to improve overall survival in randomized Phase III trials, metastatic castration-resistant prostate cancer (mCRPC) remains incurable. AREAS COVERED First, the review summarizes the current literature on the biology of mCRPC. The emerging data are increasing our understanding of the mechanisms that underlie the pathogenesis of castrate resistance and where future treatment might be headed. In the second part of the review, the authors assess the future directions in disease therapy. Indeed, novel selected therapeutic approaches, including novel agents and combinatorial therapies, are showing promising early results. EXPERT OPINION Targeting different molecular pathways in combination with immunotherapy can be a promising direction in metastatic castration prostate cancer treatment. However, several challenges still exist including elucidating the optimal use and sequencing of these new agents. There are also challenges in both the design and the interpretation of the results from clinical trials.
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Affiliation(s)
- Vittore Cereda
- University of Rome 'Tor Vergata', Tor Vergata Clinical Center, Department of Systems Medicine, Medical Oncology , V.le Oxford 81, 00133, Rome , Italy +390 620 908 190 ; +390 620 904 576 ;
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Li J, Sun Y, Jia T, Zhang R, Zhang K, Wang L. Messenger RNA vaccine based on recombinant MS2 virus-like particles against prostate cancer. Int J Cancer 2013; 134:1683-94. [PMID: 24105486 DOI: 10.1002/ijc.28482] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Accepted: 08/29/2013] [Indexed: 12/22/2022]
Abstract
Prostate cancer (PCa) is the most diagnosed cancer in the western male population with high mortality. Recently, alternative approaches based on immunotherapy including mRNA vaccines for PCa have shown therapeutic promise. However, for mRNA vaccine, several disadvantages such as the instability of mRNA, the high cost of gold particles, the limited production scale for mRNA-transfected dendritic cells in vitro, limit their development. Herein, recombinant bacteriophage MS2 virus-like particles (VLPs), which based on the interaction of a 19-nucleotide RNA aptamer and the coat protein of bacteriophage MS2, successfully addressed these questions, in which target mRNA was packaged by MS2 capsid. MS2 VLP-based mRNA vaccines were easily prepared by recombinant protein technology, nontoxic and RNase-resistant. We show the packaged mRNA was translated into protein as early as 12 hr after phagocytosed by macrophages. Moreover, MS2 VLP-based mRNA vaccines induced strong humoral and cellular immune responses, especially antigen-specific cytotoxic T-lymphocyte (CTL) and balanced Th1/Th2 responses without upregulation of CD4(+) regulatory T cells, and protected C57BL/6 mice against PCa completely. As a therapeutic vaccine, MS2 VLP-based mRNA vaccines delayed tumor growth. Our results provide proof of concept on the efficacy and safety of MS2 VLP-based mRNA vaccine, which provides a new delivery approach for mRNA vaccine and implies important clinical value for the prevention and therapy of PCa.
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Affiliation(s)
- Jinming Li
- National Center for Clinical Laboratory, Beijing Hospital of the Ministry of Health, Beijing, 100730, People's Republic of China
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