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Marsh IR, Li C, Grudzinski J, Jeffery J, Longhurst C, Adam DP, Hernandez R, Weichert JP, Harari PM, Bednarz BP. Targeting of Head and Neck Cancer by Radioiodinated CLR1404 in Murine Xenograft Tumor Models with Partial Volume Corrected Theranostic Dosimetry. Cancer Biother Radiopharm 2023; 38:458-467. [PMID: 37022739 PMCID: PMC10516227 DOI: 10.1089/cbr.2022.0084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023] Open
Abstract
Background: Delivery of radiotherapeutic dose to recurrent head and neck cancer (HNC) is primarily limited by locoregional toxicity in conventional radiotherapy. As such, HNC patients stand to benefit from the conformal targeting of primary and remnant disease achievable with radiopharmaceutical therapies. In this study, the authors investigated the tumor targeting capacity of 131I-CLR1404 (iopofosine I-131) in various HNC xenograft mouse models and the impact of partial volume correction (PVC) on theranostic dosimetry based on 124I-CLR1404 (CLR 124) positron emission tomography (PET)/computed tomography (CT) imaging. Methods: Mice bearing flank tumor xenograft models of HNC (six murine cell line and six human patient derived) were intravenously administered 6.5-9.1 MBq of CLR 124 and imaged five times over the course of 6 d using microPET/CT. In vivo tumor uptake of CLR 124 was assessed and PVC for 124I was applied using a novel preclinical phantom. Using subject-specific theranostic dosimetry estimations for iopofosine I-131 based on CLR 124 imaging, a discrete radiation dose escalation study (2, 4, 6, and 8 Gy) was performed to evaluate tumor growth response to iopofosine I-131 relative to a single fraction of external beam radiation therapy (6 Gy). Results: PET imaging demonstrated consistent tumor selective uptake and retention of CLR 124 across all HNC xenograft models. Peak uptake of 4.4% ± 0.8% and 4.2% ± 0.4% was observed in squamous cell carcinoma-22B and UW-13, respectively. PVC application increased uptake measures by 47%-188% and reduced absolute differences between in vivo and ex vivo uptake measurements from 3.3% to 1.0 percent injected activity per gram. Tumor dosimetry averaged over all HNC models was 0.85 ± 0.27 Gy/MBq (1.58 ± 0.46 Gy/MBq with PVC). Therapeutic iopofosine I-131 studies demonstrated a variable, but linear relationship between iopofosine I-131 radiation dose and tumor growth delay (p < 0.05). Conclusions: Iopofosine I-131 demonstrated tumoricidal capacity in preclinical HNC tumor models and the theranostic pairing with CLR 124 presents a promising new treatment approach for personalizing administration of iopofosine I-131.
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Affiliation(s)
- Ian R. Marsh
- Department of Radiation Oncology and Molecular Radiation Sciences, School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
- Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Chunrong Li
- Department of Human Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Joseph Grudzinski
- Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Justin Jeffery
- Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Colin Longhurst
- Department of Biostatistics and Medical Informatics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - David P. Adam
- Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Reinier Hernandez
- Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Jamey P. Weichert
- Department of Radiology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Paul M. Harari
- Department of Human Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Bryan P. Bednarz
- Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA
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2
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Lepareur N, Ramée B, Mougin-Degraef M, Bourgeois M. Clinical Advances and Perspectives in Targeted Radionuclide Therapy. Pharmaceutics 2023; 15:1733. [PMID: 37376181 DOI: 10.3390/pharmaceutics15061733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 06/09/2023] [Accepted: 06/13/2023] [Indexed: 06/29/2023] Open
Abstract
Targeted radionuclide therapy has become increasingly prominent as a nuclear medicine subspecialty. For many decades, treatment with radionuclides has been mainly restricted to the use of iodine-131 in thyroid disorders. Currently, radiopharmaceuticals, consisting of a radionuclide coupled to a vector that binds to a desired biological target with high specificity, are being developed. The objective is to be as selective as possible at the tumor level, while limiting the dose received at the healthy tissue level. In recent years, a better understanding of molecular mechanisms of cancer, as well as the appearance of innovative targeting agents (antibodies, peptides, and small molecules) and the availability of new radioisotopes, have enabled considerable advances in the field of vectorized internal radiotherapy with a better therapeutic efficacy, radiation safety and personalized treatments. For instance, targeting the tumor microenvironment, instead of the cancer cells, now appears particularly attractive. Several radiopharmaceuticals for therapeutic targeting have shown clinical value in several types of tumors and have been or will soon be approved and authorized for clinical use. Following their clinical and commercial success, research in that domain is particularly growing, with the clinical pipeline appearing as a promising target. This review aims to provide an overview of current research on targeting radionuclide therapy.
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Affiliation(s)
- Nicolas Lepareur
- Comprehensive Cancer Center Eugène Marquis, 35000 Rennes, France
- Inserm, INRAE, Institut NUMECAN (Nutrition, Métabolismes et Cancer)-UMR 1317, Univ Rennes, 35000 Rennes, France
| | - Barthélémy Ramée
- Nuclear Medicine Department, Nantes University Hospital, 44000 Nantes, France
| | - Marie Mougin-Degraef
- Nuclear Medicine Department, Nantes University Hospital, 44000 Nantes, France
- Inserm, CNRS, CRCI2NA (Centre de Recherche en Cancérologie et Immunologie Intégrée Nantes-Angers)-UMR 1307, Université de Nantes, ERL 6001, 44000 Nantes, France
| | - Mickaël Bourgeois
- Nuclear Medicine Department, Nantes University Hospital, 44000 Nantes, France
- Inserm, CNRS, CRCI2NA (Centre de Recherche en Cancérologie et Immunologie Intégrée Nantes-Angers)-UMR 1307, Université de Nantes, ERL 6001, 44000 Nantes, France
- Groupement d'Intérêt Public ARRONAX, 1 Rue Aronnax, 44817 Saint Herblain, France
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3
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Laffon E, Marthan R. Estimation of Cumulative Activity of 177Lu-Cetuximab from a Single Diagnostic 64Cu-Cetuximab Scan. Cancer Biother Radiopharm 2022; 37:403-409. [PMID: 35594295 DOI: 10.1089/cbr.2022.0006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Background: This study aimed at investigating whether a single diagnostic 64Cu-cetuximab scan might predict therapeutic 177Lu-cetuximab cumulative activity in a preclinical study. Methods: The framework of the reversible Patlak-Blasberg analysis was used to derive two independent equations of 177Lu-cetuximab cumulative activity that involve the tumor-to-blood standard uptake value ratio (i.e., the SUR) assessed at peak-time of either decay-uncorrected or decay-corrected activity concentration of trapped 64Cu-cetuximab, respectively. Applied to published data in TE-8 tumor-bearing mice, the two peak times and corresponding SUR values were assessed. Two estimates of 177Lu-cetuximab cumulative activity were then computed for comparison with two previously published values obtained from different methods. Results: The two estimates of 177Lu-cetuximab cumulative activity, computed at 14 and 59 h postinjection, were consistent with the previously published values: 4.7 × 1012 and 5.5 × 1012 versus 4.1 × 1012 and 5.3 × 1012 disintegrations/g. Conclusion: Two independent equations are proposed for estimating 177Lu-cetuximab cumulative activity from an initial diagnostic 64Cu-cetuximab scan, when acquired at two relevant injection acquisition times, respectively. Applied to published tumor-bearing mouse data, the 64Cu-cetuximab SUR assessed at either 14 or 59 h postinjection turns out to be key metrics.
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Affiliation(s)
- Eric Laffon
- CHU de Bordeaux, Bordeaux, France.,Centre de Recherche Cardio-Thoracique de Bordeaux, Universite de Bordeaux, Bordeaux, France.,INSERM U-1045, Centre de Recherche Cardio-Thoracique de Bordeaux, Bordeaux, France
| | - Roger Marthan
- CHU de Bordeaux, Bordeaux, France.,Centre de Recherche Cardio-Thoracique de Bordeaux, Universite de Bordeaux, Bordeaux, France.,INSERM U-1045, Centre de Recherche Cardio-Thoracique de Bordeaux, Bordeaux, France
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4
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Development of a Compartmental Pharmacokinetic Model for Molecular Radiotherapy with 131I-CLR1404. Pharmaceutics 2021; 13:pharmaceutics13091497. [PMID: 34575575 PMCID: PMC8465706 DOI: 10.3390/pharmaceutics13091497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 09/03/2021] [Accepted: 09/15/2021] [Indexed: 11/25/2022] Open
Abstract
Pharmacokinetic modeling of the radiopharmaceuticals used in molecular radiotherapy is an important step towards accurate radiation dosimetry of such therapies. In this paper, we present a pharmacokinetic model for CLR1404, a phospholipid ether analog that, labeled with 124I/131I, has emerged as a promising theranostic agent. We follow a systematic approach for the model construction based on a decoupling process applied to previously published experimental data, and using the goodness-of-fit, Sobol’s sensitivity analysis, and the Akaike Information Criterion to construct the optimal form of the model, investigate potential simplifications, and study factor prioritization. This methodology was applied to previously published experimental human time-activity curves for 9 organs. The resulting model consists of 17 compartments involved in the CLR1404 metabolism. Activity dynamics in most tissues are well described by a blood contribution plus a two-compartment system, describing fast and slow uptakes. The model can fit both clinical and pre-clinical kinetic data of 124I/131I. In addition, we have investigated how simple fits (exponential and biexponential) differ from the complete model. Such fits, despite providing a less accurate description of time-activity curves, may be a viable alternative when limited data is available in a practical case.
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Patel RB, Hernandez R, Carlson P, Grudzinski J, Bates AM, Jagodinsky JC, Erbe A, Marsh IR, Arthur I, Aluicio-Sarduy E, Sriramaneni RN, Jin WJ, Massey C, Rakhmilevich AL, Vail D, Engle JW, Le T, Kim K, Bednarz B, Sondel PM, Weichert J, Morris ZS. Low-dose targeted radionuclide therapy renders immunologically cold tumors responsive to immune checkpoint blockade. Sci Transl Med 2021; 13:13/602/eabb3631. [PMID: 34261797 DOI: 10.1126/scitranslmed.abb3631] [Citation(s) in RCA: 90] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 02/10/2021] [Accepted: 06/24/2021] [Indexed: 12/12/2022]
Abstract
Molecular and cellular effects of radiotherapy on tumor microenvironment (TME) can help prime and propagate antitumor immunity. We hypothesized that delivering radiation to all tumor sites could augment response to immunotherapies. We tested an approach to enhance response to immune checkpoint inhibitors (ICIs) by using targeted radionuclide therapy (TRT) to deliver radiation semiselectively to tumors. NM600, an alkylphosphocholine analog that preferentially accumulates in most tumor types, chelates a radioisotope and semiselectively delivers it to the TME for therapeutic or diagnostic applications. Using serial 86Y-NM600 positron emission tomography (PET) imaging, we estimated the dosimetry of 90Y-NM600 in immunologically cold syngeneic murine models that do not respond to ICIs alone. We observed strong therapeutic efficacy and reported optimal dose (2.5 to 5 gray) and sequence for 90Y-NM600 in combination with ICIs. After combined treatment, 45 to 66% of mice exhibited complete response and tumor-specific T cell memory, compared to 0% with 90Y-NM600 or ICI alone. This required expression of STING in tumor cells. Combined TRT and ICI activated production of proinflammatory cytokines in the TME, promoted tumor infiltration by and clonal expansion of CD8+ T cells, and reduced metastases. In mice bearing multiple tumors, combining TRT with moderate-dose (12 gray) external beam radiotherapy (EBRT) targeting a single tumor augmented response to ICIs compared to combination of ICIs with either TRT or EBRT alone. The safety of TRT was confirmed in a companion canine study. Low-dose TRT represents a translatable approach to promote response to ICIs for many tumor types, regardless of location.
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Affiliation(s)
- Ravi B Patel
- Department of Radiation Oncology, University of Pittsburgh Hillman Cancer Center, Pittsburgh, PA 15213, USA.
| | - Reinier Hernandez
- Department of Radiology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Peter Carlson
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Joseph Grudzinski
- Department of Radiology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Amber M Bates
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Justin C Jagodinsky
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Amy Erbe
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Ian R Marsh
- Department of Medical Physics, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Ian Arthur
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | | | - Raghava N Sriramaneni
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Won Jong Jin
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Christopher Massey
- Department of Radiology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | | | - David Vail
- Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53792, USA.,Barbara A. Suran Comparative Oncology Institute, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Johnathan W Engle
- Department of Radiology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Trang Le
- Department of Biostatistics and Medical Informatics, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - KyungMann Kim
- Department of Biostatistics and Medical Informatics, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Bryan Bednarz
- Department of Radiology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Paul M Sondel
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI 53792, USA.,Department of Pediatrics, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Jamey Weichert
- Department of Radiology, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Zachary S Morris
- Department of Human Oncology, University of Wisconsin-Madison, Madison, WI 53792, USA.
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Rafael MS, Cohen-Gogo S, Irwin MS, Vali R, Shammas A, Morgenstern DA. Theranostics in Neuroblastoma. PET Clin 2021; 16:419-427. [PMID: 34053585 DOI: 10.1016/j.cpet.2021.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Theranostics combines diagnosis and targeted therapy, achieved by the use of the same or similar molecules labeled with different radiopharmaceuticals or identical with different dosages. One of the best examples is the use of metaiodobenzylguanidine (MIBG). In the management of neuroblastoma-the most common extracranial solid tumor in children. MIBG has utility not only for diagnosis, risk-stratification, and response monitoring but also for cancer therapy, particularly in the setting of relapsed/refractory disease. Improved techniques and new emerging radiopharmaceuticals likely will strengthen the role of nuclear medicine in the management of neuroblastoma.
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Affiliation(s)
- Margarida Simao Rafael
- Division of Haematology/Oncology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, 555 University Ave, Toronto, ON M5G 1X8, Canada
| | - Sarah Cohen-Gogo
- Division of Haematology/Oncology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, 555 University Ave, Toronto, ON M5G 1X8, Canada
| | - Meredith S Irwin
- Division of Haematology/Oncology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, 555 University Ave, Toronto, ON M5G 1X8, Canada
| | - Reza Vali
- Division of Nuclear Medicine, Department of Diagnostic Imaging, The Hospital for Sick Children, University of Toronto, 555 University Ave, Toronto, ON M5G 1X8, Canada.
| | - Amer Shammas
- Division of Nuclear Medicine, Department of Diagnostic Imaging, The Hospital for Sick Children, University of Toronto, 555 University Ave, Toronto, ON M5G 1X8, Canada
| | - Daniel A Morgenstern
- Division of Haematology/Oncology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, 555 University Ave, Toronto, ON M5G 1X8, Canada
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7
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Jagodinsky JC, Jin WJ, Bates AM, Hernandez R, Grudzinski JJ, Marsh IR, Chakravarty I, Arthur IS, Zangl LM, Brown RJ, Nystuen EJ, Emma SE, Kerr C, Carlson PM, Sriramaneni RN, Engle JW, Aluicio-Sarduy E, Barnhart TE, Le T, Kim K, Bednarz BP, Weichert JP, Patel RB, Morris ZS. Temporal analysis of type 1 interferon activation in tumor cells following external beam radiotherapy or targeted radionuclide therapy. Theranostics 2021; 11:6120-6137. [PMID: 33995649 PMCID: PMC8120207 DOI: 10.7150/thno.54881] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 03/26/2021] [Indexed: 12/15/2022] Open
Abstract
Rationale: Clinical interest in combining targeted radionuclide therapies (TRT) with immunotherapies is growing. External beam radiation therapy (EBRT) activates a type 1 interferon (IFN1) response mediated via stimulator of interferon genes (STING), and this is critical to its therapeutic interaction with immune checkpoint blockade. However, little is known about the time course of IFN1 activation after EBRT or whether this may be induced by decay of a TRT source. Methods: We examined the IFN1 response and expression of immune susceptibility markers in B78 and B16 melanomas and MOC2 head and neck cancer murine models using qPCR and western blot. For TRT, we used 90Y chelated to NM600, an alkylphosphocholine analog that exhibits selective uptake and retention in tumor cells including B78 and MOC2. Results: We observed significant IFN1 activation in all cell lines, with peak activation in B78, B16, and MOC2 cell lines occurring 7, 7, and 1 days, respectively, following RT for all doses. This effect was STING-dependent. Select IFN response genes remained upregulated at 14 days following RT. IFN1 activation following STING agonist treatment in vitro was identical to RT suggesting time course differences between cell lines were mediated by STING pathway kinetics and not DNA damage susceptibility. In vivo delivery of EBRT and TRT to B78 and MOC2 tumors resulted in a comparable time course and magnitude of IFN1 activation. In the MOC2 model, the combination of 90Y-NM600 and dual checkpoint blockade therapy reduced tumor growth and prolonged survival compared to single agent therapy and cumulative dose equivalent combination EBRT and dual checkpoint blockade therapy. Conclusions: We report the time course of the STING-dependent IFN1 response following radiation in multiple murine tumor models. We show the potential of TRT to stimulate IFN1 activation that is comparable to that observed with EBRT and this may be critical to the therapeutic integration of TRT with immunotherapies.
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MESH Headings
- Animals
- Carcinoma, Squamous Cell/immunology
- Carcinoma, Squamous Cell/physiopathology
- Carcinoma, Squamous Cell/radiotherapy
- Cell Line, Tumor
- Combined Modality Therapy
- Dose-Response Relationship, Radiation
- Female
- Gene Expression Regulation, Neoplastic/radiation effects
- Gene Knockout Techniques
- Head and Neck Neoplasms/pathology
- Immune Checkpoint Inhibitors
- Interferon Type I/biosynthesis
- Interferon Type I/genetics
- Interferon Type I/physiology
- Lymphocytes/drug effects
- Lymphocytes/radiation effects
- Melanoma, Experimental/immunology
- Melanoma, Experimental/physiopathology
- Melanoma, Experimental/radiotherapy
- Membrane Proteins/agonists
- Membrane Proteins/deficiency
- Membrane Proteins/genetics
- Membrane Proteins/physiology
- Mice
- Mice, Inbred C57BL
- Neoplasm Proteins/agonists
- Neoplasm Proteins/physiology
- Radiopharmaceuticals/pharmacokinetics
- Radiopharmaceuticals/therapeutic use
- Time Factors
- Tumor Protein, Translationally-Controlled 1
- Tumor Stem Cell Assay
- Up-Regulation
- Yttrium Radioisotopes/pharmacokinetics
- Yttrium Radioisotopes/therapeutic use
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Affiliation(s)
- Justin C. Jagodinsky
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Won Jong Jin
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Amber M. Bates
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Reinier Hernandez
- Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Joseph J. Grudzinski
- Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Ian R. Marsh
- Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Ishan Chakravarty
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Ian S. Arthur
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Luke M. Zangl
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Ryan J. Brown
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Erin J. Nystuen
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Sarah E. Emma
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Caroline Kerr
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
- Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Peter M. Carlson
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Raghava N. Sriramaneni
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Jonathan W. Engle
- Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, WI
- Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Eduardo Aluicio-Sarduy
- Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Todd E. Barnhart
- Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Trang Le
- Department of Biostatistics and Medical Informatics, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - KyungMann Kim
- Department of Biostatistics and Medical Informatics, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Bryan P. Bednarz
- Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Jamey P. Weichert
- Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Ravi B. Patel
- Department of Radiation Oncology, University of Pittsburgh School Hillman Cancer Center, Pittsburgh, PA
| | - Zachary S. Morris
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, WI
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Shahi A, Weiss GE, Bhattacharya S, Baiu DC, Marino R, Pula T, Callander NS, Asimakopoulos F, Otto M. Targeted treatment of multiple myeloma with a radioiodinated small molecule radiopharmaceutical. Leuk Lymphoma 2021; 62:1518-1521. [PMID: 33502270 DOI: 10.1080/10428194.2021.1876858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Ankita Shahi
- Department of Pediatrics, School of Medicine and Public Health, Carbone Cancer Center, University of Wisconsin, Madison, WI, USA
| | - Gerald E Weiss
- Department of Pediatrics, School of Medicine and Public Health, Carbone Cancer Center, University of Wisconsin, Madison, WI, USA
| | - Saswati Bhattacharya
- Department of Medicine, Division of Hematology/Oncology, School of Medicine and Public Health, Carbone Cancer Center, University of Wisconsin, Madison, WI, USA
| | - Dana C Baiu
- Department of Medical Microbiology and Immunology, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
| | - Roberta Marino
- Department of Therapeutics Production and Quality, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Taner Pula
- Department of Pediatrics and Adolescent Medicine, Ulm University Medical Center, Ulm, Germany
| | - Natalie S Callander
- Department of Medicine, Division of Hematology/Oncology, School of Medicine and Public Health, Carbone Cancer Center, University of Wisconsin, Madison, WI, USA
| | - Fotis Asimakopoulos
- Department of Medicine, Division of Hematology/Oncology, School of Medicine and Public Health, Carbone Cancer Center, University of Wisconsin, Madison, WI, USA.,Department of Medicine, Division of Blood and Marrow Transplantation, Moores Cancer Center, University of California-San Diego, CA, USA
| | - Mario Otto
- Department of Pediatrics, School of Medicine and Public Health, Carbone Cancer Center, University of Wisconsin, Madison, WI, USA
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9
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Neira S, Gago-Arias A, Guiu-Souto J, Pardo-Montero J. A kinetic model of continuous radiation damage to populations of cells: comparison to the LQ model and application to molecular radiotherapy. Phys Med Biol 2020; 65:245015. [PMID: 32615551 DOI: 10.1088/1361-6560/aba21d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The linear-quadratic (LQ) model to describe the survival of irradiated cells may be the most frequently used biomathematical model in radiotherapy. There has been an intense debate on the mechanistic origin of the LQ model. An interesting approach is that of obtaining LQ-like behavior from kinetic models, systems of differential equations that model the induction and repair of damage. Development of such kinetic models is particularly interesting for application to continuous dose rate therapies, such as molecular radiotherapy or brachytherapy. In this work, we present a simple kinetic model that describes the kinetics of populations of tumor cells, rather than lethal/sub-lethal lesions, which may be especially useful for application to continuous dose rate therapies, as in molecular radiotherapy. The multi-compartment model consists of a set of three differential equations. The model incorporates in an easy way different cross-interacting compartments of cells forming a tumor, and may be of especial interest for studying dynamics of treated tumors. In the fast dose delivery limit, the model can be analytically solved, obtaining a simple closed-form expression. Fitting of several surviving curves with both this solution and the LQ model shows that they produce similar fits, despite being functionally different. We have also investigated the operation of the model in the continuous dose rate scenario, firstly by fitting pre-clinical data of tumor response to 131I-CLR1404 therapy, and secondly by showing how damage repair and proliferation rates can cause a treatment to achieve control or not. Kinetic models like the one presented in this work may be of special interest when modeling response to molecular radiotherapy.
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Affiliation(s)
- Sara Neira
- Group of Medical Physics and Biomathematics, Instituto de Investigación Sanitaria de Santiago (IDIS), Santiago de Compostela, Spain. Equal contribution
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10
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Abstract
Radiopharmaceutical therapy (RPT) is emerging as a safe and effective targeted approach to treating many types of cancer. In RPT, radiation is systemically or locally delivered using pharmaceuticals that either bind preferentially to cancer cells or accumulate by physiological mechanisms. Almost all radionuclides used in RPT emit photons that can be imaged, enabling non-invasive visualization of the biodistribution of the therapeutic agent. Compared with almost all other systemic cancer treatment options, RPT has shown efficacy with minimal toxicity. With the recent FDA approval of several RPT agents, the remarkable potential of this treatment is now being recognized. This Review covers the fundamental properties, clinical development and associated challenges of RPT. Radiopharmaceutical therapy is emerging as a safe and effective approach for the treatment of cancer, offering several advantages over existing therapeutic strategies. Here, Sgouros and colleagues provide an overview of the fundamental properties of radiopharmaceutical therapy, discuss agents in use and in clinical development and highlight the associated translational challenges.
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11
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Cimini A, Ricci M, Chiaravalloti A, Filippi L, Schillaci O. Theragnostic Aspects and Radioimmunotherapy in Pediatric Tumors. Int J Mol Sci 2020; 21:ijms21113849. [PMID: 32481723 PMCID: PMC7312954 DOI: 10.3390/ijms21113849] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 05/22/2020] [Accepted: 05/27/2020] [Indexed: 12/19/2022] Open
Abstract
The use of theragnostic radiopharmaceuticals in nuclear medicine has grown rapidly over the years to combine the diagnosis and therapy of tumors. In this review, we performed web-based and desktop literature research to investigate and explain the potential role of theragnostic imaging in pediatric oncology. We focused primarily on patients with aggressive malignancies such as neuroblastoma and brain tumors, to select patients with the highest chance of benefit from personalized therapy. Moreover, the most critical and groundbreaking applications of radioimmunotherapy in children’s oncology were examined in this peculiar context. Preliminary results showed the potential feasibility of theragnostic imaging and radioimmunotherapy in pediatric oncology. They revealed advantages in the management of the disease, thereby allowing an intra-personal approach and adding new weapons to conventional therapies.
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Affiliation(s)
- Andrea Cimini
- Department of Biomedicine and Prevention, University Tor Vergata, 00133 Rome, Italy; (M.R.); (A.C.); (O.S.)
- Correspondence: ; Tel.: +39-062-090-2467
| | - Maria Ricci
- Department of Biomedicine and Prevention, University Tor Vergata, 00133 Rome, Italy; (M.R.); (A.C.); (O.S.)
| | - Agostino Chiaravalloti
- Department of Biomedicine and Prevention, University Tor Vergata, 00133 Rome, Italy; (M.R.); (A.C.); (O.S.)
- Nuclear Medicine Section, IRCCS Neuromed, 86077 Pozzilli, Italy
| | - Luca Filippi
- Nuclear Medicine Section, “Santa Maria Goretti” Hospital, 04100 Latina, Italy;
| | - Orazio Schillaci
- Department of Biomedicine and Prevention, University Tor Vergata, 00133 Rome, Italy; (M.R.); (A.C.); (O.S.)
- Nuclear Medicine Section, IRCCS Neuromed, 86077 Pozzilli, Italy
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12
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Vail DM, LeBlanc AK, Jeraj R. Advanced Cancer Imaging Applied in the Comparative Setting. Front Oncol 2020; 10:84. [PMID: 32117739 PMCID: PMC7019008 DOI: 10.3389/fonc.2020.00084] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Accepted: 01/16/2020] [Indexed: 11/13/2022] Open
Abstract
The potential for companion (pet) species with spontaneously arising tumors to act as surrogates for preclinical development of advanced cancer imaging technologies has become more apparent in the last decade. The utility of the companion model specifically centers around issues related to body size (including spatial target/normal anatomic characteristics), physical size and spatial distribution of metastasis, tumor heterogeneity, the presence of an intact syngeneic immune system and a syngeneic tumor microenvironment shaped by the natural evolution of the cancer. Companion species size allows the use of similar equipment, hardware setup, software, and scan protocols which provide the opportunity for standardization and harmonization of imaging operating procedures and quality assurance across imaging protocols, imaging hardware, and the imaged species. Murine models generally do not replicate the size and spatial distribution of human metastatic cancer and these factors strongly influence image resolution and dosimetry. The following review will discuss several aspects of comparative cancer imaging in more detail while providing several illustrative examples of investigational approaches performed or currently under exploration at our institutions. Topics addressed include a discussion on interested consortia; image quality assurance and harmonization; image-based biomarker development and validation; contrast agent and radionuclide tracer development; advanced imaging to assess and predict response to cytotoxic and immunomodulatory anticancer agents; imaging of the tumor microenvironment; development of novel theranostic approaches; cell trafficking assessment via non-invasive imaging; and intraoperative imaging to inform surgical oncology decision making. Taken in totality, these comparative opportunities predict that safety, diagnostic and efficacy data generated in companion species with naturally developing and progressing cancers would better recapitulate the human cancer condition than that of artificial models in small rodent systems and ultimately accelerate the integration of novel imaging technologies into clinical practice. It is our hope that the examples presented should serve to provide those involved in cancer investigations who are unfamiliar with available comparative methodologies an understanding of the potential utility of this approach.
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Affiliation(s)
- David M Vail
- Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, United States.,Carbone Cancer Center, University of Wisconsin-Madison, Madison, WI, United States
| | - Amy K LeBlanc
- Comparative Oncology Program, Center for Cancer Research, National Cancer Institute, Bethesda, MD, United States
| | - Robert Jeraj
- Carbone Cancer Center, University of Wisconsin-Madison, Madison, WI, United States.,Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, United States
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13
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Anderson PM. Radiopharmaceuticals for Treatment of Osteosarcoma. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1257:45-53. [PMID: 32483729 DOI: 10.1007/978-3-030-43032-0_4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Although trace amounts of radioactivity are routinely used to detect osteosarcoma, the use of larger therapeutic amounts of radiation is often an unrecognized opportunity to treat metastatic osteosarcoma. This chapter will review a number of approaches to use ionizing radiation in the form of injectable radiopharmaceuticals. Since bone metastases are a common pattern of metastatic spread of cancer in general, a number of bone-seeking radiopharmaceuticals have been developed and FDA approved for treatment of bone metastases. Although osteosarcoma, a bone-forming cancer, would seem ideally suited to be treated with bone seekers, patterns of relapse involving non-ossifying metastases remain a major problem to be overcome. Thus, this review will not only describe experience using a number of bone-seeking radiopharmaceuticals such as 153-samarium-EDTMP, 153-samarium-DOTMP, and 223-radium against osteosarcoma, but also approaches to identify patients who may benefit as well as some means to the improve overall efficacy including combination therapy with routine agents and using nuclear imaging to develop best strategy for use. These include imaging with not only 99mTc-MDP standard bone scans, but also 99mTc-MDP bone scans with SPECT CT, bone-specific sodium fluoride PET-CT (Na18F), and 18FDG-PET-CT. Accurate knowledge of oligometastatic active disease can facilitate more effective use of combination therapy, including radiosensitizers and local control measures, for example, stereotactic body radiotherapy (SBRT) and/or cryoablation to reduce disease burden as well as manage and prevent micrometastatic disease from growing and metastasizing. Finally, a new tumor-specific radiopharmaceutical, CLR 131, may also provide another radiopharmaceutical to treat both osteoblastic and non-ossifying areas of osteosarcoma.
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Affiliation(s)
- Peter M Anderson
- Pediatric and Taussig Cancer Institutes, Department of Pediatric Hematology, Oncology and BMT, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH, USA.
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14
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Marsh IR, Grudzinski J, Baiu DC, Besemer A, Hernandez R, Jeffery JJ, Weichert JP, Otto M, Bednarz BP. Preclinical Pharmacokinetics and Dosimetry Studies of 124I/ 131I-CLR1404 for Treatment of Pediatric Solid Tumors in Murine Xenograft Models. J Nucl Med 2019; 60:1414-1420. [PMID: 30926646 DOI: 10.2967/jnumed.118.225409] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Accepted: 03/07/2019] [Indexed: 01/06/2023] Open
Abstract
Cancer is the second leading cause of death for children between the ages of 5 and 14 y. For children diagnosed with metastatic or recurrent solid tumors, for which the utility of external-beam radiotherapy is limited, the prognosis is particularly poor. The availability of tumor-targeting radiopharmaceuticals for molecular radiotherapy (MRT) has demonstrated improved outcomes in these patient populations, but options are nonexistent or limited for most pediatric solid tumors. 18-(p-iodophenyl)octadecylphosphocholine (CLR1404) is a novel antitumor alkyl phospholipid ether analog that broadly targets cancer cells. In this study, we evaluated the in vivo pharmacokinetics of 124I-CLR1404 (CLR 124) and estimated theranostic dosimetry for 131I-CLR1404 (CLR 131) MRT in murine xenograft models of the pediatric solid tumors neuroblastoma, rhabdomyosarcoma, and Ewing sarcoma. Methods: Tumor-bearing mice were imaged with small-animal PET/CT to evaluate the whole-body distribution of CLR 124 and, correcting for differences in radioactive decay, predict that of CLR 131. Image volumes representing CLR 131 provided input for Geant4 Monte Carlo simulations to calculate subject-specific tumor dosimetry for CLR 131 MRT. Pharmacokinetics for CLR 131 were extrapolated to adult and pediatric humans to estimate normal-tissue dosimetry. In neuroblastoma, a direct comparison of CLR 124 with 124I-metaiodobenzylguanidine (124I-MIBG) in an MIBG-avid model was performed. Results: In vivo pharmacokinetics of CLR 124 showed selective uptake and prolonged retention across all pediatric solid tumor models investigated. Subject-specific tumor dosimetry for CLR 131 MRT presents a correlative relationship with tumor-growth delay after CLR 131 MRT. Peak uptake of CLR 124 was, on average, 22% higher than that of 124I-MIBG in an MIBG-avid neuroblastoma model. Conclusion: CLR1404 is a suitable theranostic scaffold for dosimetry and therapy with potentially broad applicability in pediatric oncology. Given the ongoing clinical trials for CLR 131 in adults, these data support the development of pediatric clinical trials and provide detailed dosimetry that may lead to improved MRT treatment planning.
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Affiliation(s)
- Ian R Marsh
- Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin
| | - Joseph Grudzinski
- Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin
| | - Dana C Baiu
- Department of Pediatrics, Carbone Cancer Center, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin
| | - Abigail Besemer
- Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, Nebraska; and
| | - Reinier Hernandez
- Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin
| | - Justin J Jeffery
- Department of Radiology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin
| | - Jamey P Weichert
- Department of Radiology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin
| | - Mario Otto
- Department of Pediatrics, Carbone Cancer Center, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin
| | - Bryan P Bednarz
- Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin
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Dzobo K, Senthebane DA, Thomford NE, Rowe A, Dandara C, Parker MI. Not Everyone Fits the Mold: Intratumor and Intertumor Heterogeneity and Innovative Cancer Drug Design and Development. OMICS-A JOURNAL OF INTEGRATIVE BIOLOGY 2019; 22:17-34. [PMID: 29356626 DOI: 10.1089/omi.2017.0174] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Disruptive innovations in medicine are game-changing in nature and bring about radical shifts in the way we understand human diseases, their treatment, and/or prevention. Yet, disruptive innovations in cancer drug design and development are still limited. Therapies that cure all cancer patients are in short supply or do not exist at all. Chief among the causes of this predicament is drug resistance, a mechanism that is much more dynamic than previously understood. Drug resistance has limited the initial success experienced with biomarker-guided targeted therapies as well. A major contributor to drug resistance is intratumor heterogeneity. For example, within solid tumors, there are distinct subclones of cancer cells, presenting profound complexity to cancer treatment. Well-known contributors to intratumor heterogeneity are genomic instability, the microenvironment, cellular genotype, cell plasticity, and stochastic processes. This expert review explains that for oncology drug design and development to be more innovative, we need to take into account intratumor heterogeneity. Initially thought to be the preserve of cancer cells, recent evidence points to the highly heterogeneous nature and diverse locations of stromal cells, such as cancer-associated fibroblasts (CAFs) and cancer-associated macrophages (CAMs). Distinct subpopulations of CAFs and CAMs are now known to be located immediately adjacent and distant from cancer cells, with different subpopulations exerting different effects on cancer cells. Disruptive innovation and precision medicine in clinical oncology do not have to be a distant reality, but can potentially be achieved by targeting these spatially separated and exclusive cancer cell subclones and CAF subtypes. Finally, we emphasize that disruptive innovations in drug discovery and development will likely come from drugs whose effect is not necessarily tumor shrinkage.
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Affiliation(s)
- Kevin Dzobo
- 1 International Centre for Genetic Engineering and Biotechnology (ICGEB) , Cape Town, South Africa .,2 Division of Medical Biochemistry, Department of Integrative Biomedical Sciences, Faculty of Health Sciences, Institute of Infectious Disease and Molecular Medicine, University of Cape Town , Cape Town, South Africa
| | - Dimakatso Alice Senthebane
- 1 International Centre for Genetic Engineering and Biotechnology (ICGEB) , Cape Town, South Africa .,2 Division of Medical Biochemistry, Department of Integrative Biomedical Sciences, Faculty of Health Sciences, Institute of Infectious Disease and Molecular Medicine, University of Cape Town , Cape Town, South Africa
| | - Nicholas Ekow Thomford
- 3 Pharmacogenetics Research Group, Division of Human Genetics, Department of Pathology, Faculty of Health Sciences, Institute of Infectious Diseases and Molecular Medicine, University of Cape Town , Cape Town, South Africa
| | - Arielle Rowe
- 1 International Centre for Genetic Engineering and Biotechnology (ICGEB) , Cape Town, South Africa
| | - Collet Dandara
- 3 Pharmacogenetics Research Group, Division of Human Genetics, Department of Pathology, Faculty of Health Sciences, Institute of Infectious Diseases and Molecular Medicine, University of Cape Town , Cape Town, South Africa
| | - M Iqbal Parker
- 2 Division of Medical Biochemistry, Department of Integrative Biomedical Sciences, Faculty of Health Sciences, Institute of Infectious Disease and Molecular Medicine, University of Cape Town , Cape Town, South Africa
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16
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Elsaid MY, Shahi A, Wang AR, Baiu DC, Li C, Werner LR, Singhal S, Hall LT, Weichert JP, Armstrong EA, Bednarz BP, Harari PM, Iyer G, Otto M. Enhanced Radiosensitivity in Solid Tumors using a Tumor-selective Alkyl Phospholipid Ether Analog. Mol Cancer Ther 2018; 17:2320-2328. [PMID: 30108133 DOI: 10.1158/1535-7163.mct-17-0897] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 05/08/2018] [Accepted: 08/10/2018] [Indexed: 11/16/2022]
Abstract
Antitumor alkyl phospholipid (APL) analogs comprise a group of structurally related molecules with remarkable tumor selectivity. Some of these compounds have shown radiosensitizing capabilities. CLR127 is a novel, clinical-grade antitumor APL ether analog, a subtype of synthetic APL broadly targeting cancer cells with limited uptake in normal tissues. The purpose of this study was to investigate the effect of CLR127 to modulate radiation response across several adult and pediatric cancer types in vitro as well as in murine xenograft models of human prostate adenocarcinoma, neuroblastoma, Ewing sarcoma, and rhabdomyosarcoma. In vitro, CLR127 demonstrated selective uptake in cancer cells compared to normal cells. In cancer cells, CLR127 treatment prior to radiation significantly decreased clonogenic survival in vitro, and led to increased radiation-induced double-stranded DNA (dsDNA) breakage compared with radiation alone, which was not observed in normal controls. In animal models, CLR127 effectively increased the antitumor response to fractionated radiotherapy and led to delayed tumor regrowth at potentially clinically achievable doses. In conclusion, our study highlights the ability of CLR127 to increase radiation response in several cancer types. Given almost universal uptake of CLR127 in malignant cells, future research should test whether the observed effects can be extended to other tumor types. Our data provide a strong rationale for clinical testing of CLR127 as a tumor-targeted radiosensitizing agent. Mol Cancer Ther; 17(11); 2320-8. ©2018 AACR.
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Affiliation(s)
- Mohamed Y Elsaid
- Division of Hematology, Oncology & Bone Marrow Transplant, Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Ankita Shahi
- Division of Hematology, Oncology & Bone Marrow Transplant, Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Albert R Wang
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Dana C Baiu
- Division of Hematology, Oncology & Bone Marrow Transplant, Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Chunrong Li
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Lauryn R Werner
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Sorabh Singhal
- Division of Hematology, Oncology & Bone Marrow Transplant, Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Lance T Hall
- Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Jamey P Weichert
- Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Eric A Armstrong
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Bryan P Bednarz
- Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Paul M Harari
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Gopal Iyer
- Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
| | - Mario Otto
- Division of Hematology, Oncology & Bone Marrow Transplant, Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin.
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