1
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White JM, Escorcia FE, Viola NT. Perspectives on metals-based radioimmunotherapy (RIT): moving forward. Theranostics 2021; 11:6293-6314. [PMID: 33995659 PMCID: PMC8120204 DOI: 10.7150/thno.57177] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 03/22/2021] [Indexed: 12/18/2022] Open
Abstract
Radioimmunotherapy (RIT) is FDA-approved for the clinical management of liquid malignancies, however, its use for solid malignancies remains a challenge. The putative benefit of RIT lies in selective targeting of antigens expressed on the tumor surface using monoclonal antibodies, to systemically deliver cytotoxic radionuclides. The past several decades yielded dramatic improvements in the quality, quantity, recent commercial availability of alpha-, beta- and Auger Electron-emitting therapeutic radiometals. Investigators have created new or improved existing bifunctional chelators. These bifunctional chelators bind radiometals and can be coupled to antigen-specific antibodies. In this review, we discuss approaches to develop radiometal-based RITs, including the selection of radiometals, chelators and antibody platforms (i.e. full-length, F(ab')2, Fab, minibodies, diabodies, scFv-Fc and nanobodies). We cite examples of the performance of RIT in the clinic, describe challenges to its implementation, and offer insights to address gaps toward translation.
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MESH Headings
- Animals
- Antibodies, Monoclonal/administration & dosage
- Antibodies, Monoclonal/therapeutic use
- Antigens, Neoplasm/immunology
- Antineoplastic Agents, Immunological/administration & dosage
- Antineoplastic Agents, Immunological/metabolism
- Antineoplastic Agents, Immunological/therapeutic use
- Chelating Agents/administration & dosage
- Chelating Agents/metabolism
- Click Chemistry
- Clinical Trials as Topic
- Dose Fractionation, Radiation
- Drug Delivery Systems
- Forecasting
- Humans
- Immunoglobulin Fab Fragments/administration & dosage
- Immunoglobulin Fab Fragments/therapeutic use
- Lymphoma, Non-Hodgkin/radiotherapy
- Mice
- Molecular Targeted Therapy
- Neoplasm Proteins/antagonists & inhibitors
- Neoplasms, Experimental/diagnostic imaging
- Neoplasms, Experimental/radiotherapy
- Organ Specificity
- Precision Medicine
- Radiation Tolerance
- Radioimmunotherapy/methods
- Radiopharmaceuticals/administration & dosage
- Radiopharmaceuticals/therapeutic use
- Receptor Protein-Tyrosine Kinases/antagonists & inhibitors
- Single-Chain Antibodies/administration & dosage
- Single-Chain Antibodies/therapeutic use
- Single-Domain Antibodies/administration & dosage
- Single-Domain Antibodies/therapeutic use
- Yttrium Radioisotopes/administration & dosage
- Yttrium Radioisotopes/therapeutic use
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Affiliation(s)
- Jordan M. White
- Cancer Biology Graduate Program, Wayne State University School of Medicine, Detroit, MI 48201
- Department of Oncology, Karmanos Cancer Institute, Detroit, MI 48201
| | - Freddy E. Escorcia
- Molecular Imaging Branch, Radiation Oncology Branch, National Cancer Institute, Bethesda, MD 20814
| | - Nerissa T. Viola
- Department of Oncology, Karmanos Cancer Institute, Detroit, MI 48201
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2
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Bordes A, Poveda A, Troadec T, Franconetti A, Ardá A, Perrin F, Ménand M, Sollogoub M, Guillard J, Désiré J, Tripier R, Jiménez-Barbero J, Blériot Y. Synthesis, Conformational Analysis, and Complexation Study of an Iminosugar-Aza-Crown, a Sweet Chiral Cyclam Analog. Org Lett 2020; 22:2344-2349. [PMID: 32153195 PMCID: PMC7114874 DOI: 10.1021/acs.orglett.0c00503] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
A new family of chiral C2 symmetric
tetraazamacrocycles, coined ISAC for IminoSugar Aza-Crown, incorporating
two iminosugars adopting a 4C1 conformation
is disclosed. Multinuclear NMR experiments on the corresponding Cd2+ complex show that the ISAC is a strong chelator in water
and its tetramine cavity adopts a conformation similar to that of
the parent Cd–cyclam complex. Similar behavior is observed
with Cu2+ in solution, with enhanced stability compared
to the Cu–cyclam complex.
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Affiliation(s)
- Alexandra Bordes
- Université de Poitiers, IC2MP, UMR CNRS 7285, Equipe "Synthèse Organique", Groupe Glycochimie 4 rue Michel Brunet, 86073 Poitiers cedex 9, France
| | - Ana Poveda
- CIC bioGUNE, Parque Tecnológico de Bizkaia, Edif. 801A-1°, Derio-Bizkaia 48160, Spain
| | - Thibault Troadec
- Universite de Brest, UMR-CNRS 6521 CEMCA, 6 Avenue Victor le Gorgeu, 29200 Brest, France
| | - Antonio Franconetti
- CIC bioGUNE, Parque Tecnológico de Bizkaia, Edif. 801A-1°, Derio-Bizkaia 48160, Spain
| | - Ana Ardá
- CIC bioGUNE, Parque Tecnológico de Bizkaia, Edif. 801A-1°, Derio-Bizkaia 48160, Spain
| | - Flavie Perrin
- Université de Poitiers, IC2MP, UMR CNRS 7285, Equipe "Synthèse Organique", Groupe Glycochimie 4 rue Michel Brunet, 86073 Poitiers cedex 9, France
| | - Mickaël Ménand
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, 4 place Jussieu, 75005 Paris, France
| | - Matthieu Sollogoub
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, 4 place Jussieu, 75005 Paris, France
| | - Jerôme Guillard
- Université de Poitiers, IC2MP, UMR CNRS 7285, Equipe "Synthèse Organique", Groupe Glycochimie 4 rue Michel Brunet, 86073 Poitiers cedex 9, France
| | - Jérôme Désiré
- Université de Poitiers, IC2MP, UMR CNRS 7285, Equipe "Synthèse Organique", Groupe Glycochimie 4 rue Michel Brunet, 86073 Poitiers cedex 9, France
| | - Raphaël Tripier
- Universite de Brest, UMR-CNRS 6521 CEMCA, 6 Avenue Victor le Gorgeu, 29200 Brest, France
| | - Jesús Jiménez-Barbero
- CIC bioGUNE, Parque Tecnológico de Bizkaia, Edif. 801A-1°, Derio-Bizkaia 48160, Spain.,IKERBASQUE, Basque Foundation for Science, 48009 Bilbao, Spain.,Dept. Organic Chemistry II, Faculty of Science and Technology, University of the Basque Country, 48940 Leioa, Spain
| | - Yves Blériot
- Université de Poitiers, IC2MP, UMR CNRS 7285, Equipe "Synthèse Organique", Groupe Glycochimie 4 rue Michel Brunet, 86073 Poitiers cedex 9, France
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3
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Brasse D, Nonat A. Radiometals: towards a new success story in nuclear imaging? Dalton Trans 2015; 44:4845-58. [DOI: 10.1039/c4dt02911a] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The use of radiometal isotopes in positron emission tomography: a new success story in nuclear imaging?
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Affiliation(s)
- David Brasse
- Université de Strasbourg
- 67037 Strasbourg
- France
- CNRS
- UMR7178
| | - Aline Nonat
- Université de Strasbourg
- 67087 Strasbourg
- France
- CNRS
- UMR7178
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4
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Lima LMP, Esteban-Gómez D, Delgado R, Platas-Iglesias C, Tripier R. Monopicolinate Cyclen and Cyclam Derivatives for Stable Copper(II) Complexation. Inorg Chem 2012; 51:6916-27. [DOI: 10.1021/ic300784v] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Luís M. P. Lima
- Université de Bretagne Occidentale, UMR-CNRS 6521, UFR des Sciences
et Techniques, 6 avenue Victor le Gorgeu, C.S. 93837, 29238 Brest
Cedex 3, France
- Instituto
de Tecnologia Química
e Biológica, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - David Esteban-Gómez
- Departamento de Química
Fundamental, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña,
Spain
| | - Rita Delgado
- Instituto
de Tecnologia Química
e Biológica, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Carlos Platas-Iglesias
- Departamento de Química
Fundamental, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña,
Spain
| | - Raphaël Tripier
- Université de Bretagne Occidentale, UMR-CNRS 6521, UFR des Sciences
et Techniques, 6 avenue Victor le Gorgeu, C.S. 93837, 29238 Brest
Cedex 3, France
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5
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Abada S, Lecointre A, Déchamps-Olivier I, Platas-Iglesias C, Christine C, Elhabiri M, Charbonniere L. Highly stable acyclic bifunctional chelator for 64Cu PET imaging. ACTA ACUST UNITED AC 2011. [DOI: 10.1524/ract.2011.1823] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Ligand L1, based on a pyridine scaffold, functionalized by two bis(methane phosphonate)aminomethyl groups, was shown to display a very high affinity towards Cu(II) (log K
CuL=22.7) and selectivity over Ni(II), Co(II), Zn(II) and Ga(III) (Δ log K
ML>4) as shown by the values of the stability constants obtained from potentiometric measurements. Insights into the coordination mode of the ligand around Cu(II) cation were obtained by UV-Vis absorption and EPR spectroscopies as well as density functional theory (DFT) calculations (B3LYP model) performed in aqueous solution. The results point to a pentacoordination pattern of the metal ion in the fully deprotonated [CuL1]6− species. Considering the beneficial thermodynamic parameters of this ligand, kinetic experiments were run to follow the formation of the copper(II) complexes, indicating a very rapid formation of the complex, appropriat e for 64Cu complexation. As L1 represents a particularly interesting target within the frame of 64Cu PET imaging, a synthetic protocol was developed to introduce a labeling function on the pyridyl moiety of L1, thereby affording L2, a potential bifunctional chelator (BFC) for PET imaging.
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Affiliation(s)
- S. Abada
- Laboratoire d′Ingénierie Moléculaire Appliquée à l′Analyse, IPHC, UMR 7178 CNRS/UdS, ECPM, Bât R1N0, Strasbourg Cedex 02, Frankreich
| | - A. Lecointre
- Laboratoire d′Ingénierie Moléculaire Appliquée à l′Analyse, IPHC, UMR 7178 CNRS/UdS, ECPM, Bât R1N0, 67087 Strasbourg Cedex 02, Frankreich
| | - I. Déchamps-Olivier
- Université de Reims Champagne Ardenne, Institut de Chimie Moléculaire de Reims, Groupe Chimie de Coordination, CNRS UMR 6229, Bât., 51687 REIMS CEDEX 2, Frankreich
| | - C. Platas-Iglesias
- Universidade da Coruna, Departamento de Quimica Fundamental, A Coruna, Spanien
| | - C. Christine
- Laboratoire, D'Ingénierie Moléculaire Appliquée, IPHC, UMR 7178 CNRS/UdS, Strasbourg, Frankreich
| | - M. Elhabiri
- Institut de Chjmie, Lab de Physico-Chimie Bioinorganique, UMR 7177 CNRS/UdS, Strasbourg, Frankreich
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6
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Léo PM, Morin C, Philouze C. Design and synthesis of a cyclitol-derived scaffold with axial pyridyl appendages and its encapsulation of the silver(I) cation. Beilstein J Org Chem 2010; 6:1022-4. [PMID: 21085514 PMCID: PMC2982085 DOI: 10.3762/bjoc.6.115] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2010] [Accepted: 10/18/2010] [Indexed: 11/23/2022] Open
Abstract
Conversion of a myo-inositol derivative into a scyllo-inositol-derived scaffold with C₃(v) symmetry bearing three axial pyridyl appendages is presented. This pre-organized hexadentate ligand allows complexation of silver(I). The crystal structure of the complex was established.
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Affiliation(s)
- Pierre-Marc Léo
- Département de Chimie Moléculaire (CNRS, UMR 5250, ICMG FR-2607) Université Joseph Fourier, 301 Rue de la Chimie, 38402 Grenoble Cedex, France
| | - Christophe Morin
- Département de Chimie Moléculaire (CNRS, UMR 5250, ICMG FR-2607) Université Joseph Fourier, 301 Rue de la Chimie, 38402 Grenoble Cedex, France
| | - Christian Philouze
- Département de Chimie Moléculaire (CNRS, UMR 5250, ICMG FR-2607) Université Joseph Fourier, 301 Rue de la Chimie, 38402 Grenoble Cedex, France
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7
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Ramli M, Smith SV, Lindoy LF. Investigation of novel bis- and tris-tetraazamacrocycles for use in the copper-64 ((64)Cu) radiolabeling of antibodies with potential to increase the therapeutic index for drug targeting. Bioconjug Chem 2010; 20:868-76. [PMID: 19397314 DOI: 10.1021/bc800337d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The (64)Cu complexes of a series of mono-, bis-, and tris-tetraazamacrocycles have been prepared, and their stability in human sera has been assessed. The ligands forming the most stable Cu(2+) complexes were then conjugated to the B72.3 antibody (mAb). Conditions for conjugation of the ligands to the mAb were optimized for the concentration of protein, ligand, pH, temperature, and time. The optimum moles of Cu(2+) attached to the mAb were as high as 3.5 for L2 and 5.5 or 2.7 for L5, and the immunoreactivity was > or =80%. Biodistribution of the radioimmunoconjugates showed good tumor localization and target-to-background ratios that were significantly enhanced compared to those achieved with monotetraazamacrocyclic derivatives.
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Affiliation(s)
- Martalena Ramli
- Centre for Radioisotopes and Radiopharmaceuticals, Kawasan PUSPIPTEK, Serpong, Tangerang, Banten, Indonesia
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8
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Papini G, Alidori S, Lewis JS, Reichert DE, Pellei M, Lobbia GG, Biddlecombe GB, Anderson CJ, Santini C. Synthesis and characterization of the copper(II) complexes of new N2S2-donor macrocyclic ligands: synthesis and in vivo evaluation of the (64)Cu complexes. Dalton Trans 2009:177-84. [PMID: 19081987 PMCID: PMC4418490 DOI: 10.1039/b808831d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The aim of this work was to prepare a novel class of (64)Cu(II) labeled complexes with the new macrocyclic ligands 1,10-dithia-4,7-diazacyclododecane-3,8-dicarboxylic acid (NEC-SE, 1), 1,10-dithia-4,7-diazacyclotridecane-3,8-dicarboxylic acid (NEC-SP, 2) and 1,10-dithia-4,7-diazacyclotetradecane-3,8-dicarboxylic acid, (NEC-SB, 3 ) to evaluate the usefulness of these macrocycles for potential utility as (64)Cu(II) chelators. The corresponding non-radioactive complexes [Cu(NEC-SE)] x 3H(2)O (4), [Cu(NEC-SP)] x 3H(2)O (5) and [Cu(NEC-SB)] (6) were prepared and their (64)Cu-analogs, [(64)Cu(NEC-SE)] (7) and [(64)Cu(NEC-SP)] (8) and [(64)Cu(NEC-SB)] (9) were produced in >98% radiochemical purity. Rats were injected with complex 7, 8 or 9 and were euthanized at 1, 4 and 24 h. All three complexes are cleared from the blood over the first hour following injection but there is poor clearance of this activity over 24 h. A similar pattern of retention was noted in the liver where the levels of activity in this tissue at 1 h are not statistically different from those at 24 h. Molecular mechanics and DFT studies were performed on the complexes in order to gain insight into the lower stability.
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Affiliation(s)
- Grazia Papini
- Dipartimento di Scienze Chimiche, Università di Camerino, via S. Agostino 1, 62032, Camerino, MC, Italy
| | - Simone Alidori
- Dipartimento di Scienze Chimiche, Università di Camerino, via S. Agostino 1, 62032, Camerino, MC, Italy
| | - Jason S. Lewis
- Division of Radiological Sciences, Washington University School of Medicine, St. Louis, MO 63110, USA
- Alvin J. Siteman Cancer Center, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - David E. Reichert
- Division of Radiological Sciences, Washington University School of Medicine, St. Louis, MO 63110, USA
- Alvin J. Siteman Cancer Center, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Maura Pellei
- Dipartimento di Scienze Chimiche, Università di Camerino, via S. Agostino 1, 62032, Camerino, MC, Italy
| | - Giancarlo Gioia Lobbia
- Dipartimento di Scienze Chimiche, Università di Camerino, via S. Agostino 1, 62032, Camerino, MC, Italy
| | - Gráinne B. Biddlecombe
- Division of Radiological Sciences, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Carolyn J. Anderson
- Division of Radiological Sciences, Washington University School of Medicine, St. Louis, MO 63110, USA
- Alvin J. Siteman Cancer Center, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Carlo Santini
- Dipartimento di Scienze Chimiche, Università di Camerino, via S. Agostino 1, 62032, Camerino, MC, Italy
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9
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Charbonnière L, Mameri S, Kadjane P, Platas-Iglesias C, Ziessel R. Tuning the Coordination Sphere around Highly Luminescent Lanthanide Complexes. Inorg Chem 2008; 47:3748-62. [DOI: 10.1021/ic702472n] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Loïc Charbonnière
- Laboratoire de Chimie Moléculaire, associé au CNRS, ECPM-ULP, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France, and Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Alejandro de la Sota 1, 15008 A Coruña, Spain
| | - Samir Mameri
- Laboratoire de Chimie Moléculaire, associé au CNRS, ECPM-ULP, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France, and Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Alejandro de la Sota 1, 15008 A Coruña, Spain
| | - Pascal Kadjane
- Laboratoire de Chimie Moléculaire, associé au CNRS, ECPM-ULP, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France, and Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Alejandro de la Sota 1, 15008 A Coruña, Spain
| | - Carlos Platas-Iglesias
- Laboratoire de Chimie Moléculaire, associé au CNRS, ECPM-ULP, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France, and Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Alejandro de la Sota 1, 15008 A Coruña, Spain
| | - Raymond Ziessel
- Laboratoire de Chimie Moléculaire, associé au CNRS, ECPM-ULP, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France, and Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Alejandro de la Sota 1, 15008 A Coruña, Spain
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Boswell CA, Brechbiel MW. Development of radioimmunotherapeutic and diagnostic antibodies: an inside-out view. Nucl Med Biol 2007; 34:757-78. [PMID: 17921028 PMCID: PMC2212602 DOI: 10.1016/j.nucmedbio.2007.04.001] [Citation(s) in RCA: 182] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2007] [Revised: 03/29/2007] [Accepted: 04/04/2007] [Indexed: 11/25/2022]
Abstract
Only a handful of radiolabeled antibodies (Abs) have gained US Food and Drug Administration (FDA) approval for use in clinical oncology, including four immunodiagnostic agents and two targeted radioimmunotherapeutic agents. Despite the advent of nonimmunogenic Abs and the availability of a diverse library of radionuclides, progress beyond early Phase II radioimmunotherapy (RIT) studies in solid tumors has been marginal. Furthermore, [18F]fluorodeoxyglucose continues to dominate the molecular imaging domain, underscored by a decade-long absence of any newly approved Ab-based imaging agent (none since 1996). Why has the development of clinically successful Abs for RIT been limited to lymphoma? What obstacles must be overcome to allow the FDA approval of immuno-positron emission tomography (immuno-PET) imaging agents? How can we address the unique challenges that have thus far prevented the introduction of Ab-based imaging agents and therapeutics for solid tumors? Many poor decisions have been made regarding radiolabeled Abs, but useful insight can be gained from these mistakes. The following review addresses the physical, chemical, biological, clinical, regulatory and financial limitations that impede the progress of this increasingly important class of drugs.
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Affiliation(s)
- C. Andrew Boswell
- Radioimmune & Inorganic Chemistry Section, Radiation Oncology Branch, National Cancer Institute, Building 10 Center Drive, Bethesda, Maryland, 20892-1088
| | - Martin W. Brechbiel
- Radioimmune & Inorganic Chemistry Section, Radiation Oncology Branch, National Cancer Institute, Building 10 Center Drive, Bethesda, Maryland, 20892-1088
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11
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Voloshin YZ, Varzatskii OA, Bubnov YN. Cage complexes of transition metals in biochemistry and medicine. Russ Chem Bull 2007. [DOI: 10.1007/s11172-007-0100-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Charbonnière LJ, Mameri S, Flot D, Waltz F, Zandanel C, Ziessel RF. A disymmetric terpyridine based ligand for the formation of luminescent di-aquo lanthanide complexes. Dalton Trans 2007:2245-53. [PMID: 17534485 DOI: 10.1039/b700837f] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of ligand H3 based on a disymmetrically substituted terpyridine core functionalised by a carboxylic acid in the 6-position and a bis(carboxymethyl)aminomethyl function in the 6''-position is described. The coordination behaviour of this heptadentate (4N/3O) ligand with lanthanide cations (Ln=Eu, Gd and Tb) was studied in solution showing the formation of complexes with [Ln] stoichiometry. Complexes with general formula [Ln(H2O)2] were isolated from neutral water solutions containing equimolar amounts of cations and ligands, and the complexes were characterized in the solid state (elemental analysis, IR) and in solution (mass spectrometry). The photo-physical properties of the luminescent complexes of Eu and Tb were studied in water solution by means of absorption, steady state and time-resolved emission spectroscopies. Evolution of the luminescence lifetimes of the Eu and Tb complexes in H2O and D2O reveals the presence of two water molecules coordinated in the first coordination sphere of the cations. Despite this important hydration number, the overall luminescence quantum yields of the complexes remained elevated, especially in the case of Tb (Phi=22.0 and 6.5% respectively for Tb and Eu). Upon crystallisation the Gd complex formed dimeric species in which two gadolinium atoms are each heptacoordinated by one ligand, the coordination sphere being completed by a single water molecule and a bridging carboxylate function, pointing to different behaviours in the solid and liquid states.
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Affiliation(s)
- Loïc J Charbonnière
- Laboratoire de Chimie Moléculaire, UMR 7509 CNRS, ECPM-ULP, 25, rue Becquerel, 67087, Strasbourg Cedex 02, France.
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13
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Delgado R, Félix V, Lima LMP, Price DW. Metal complexes of cyclen and cyclam derivatives useful for medical applications: a discussion based on thermodynamic stability constants and structural data. Dalton Trans 2007:2734-45. [PMID: 17592589 DOI: 10.1039/b704360k] [Citation(s) in RCA: 141] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of the most common chelators used in magnetic resonance imaging (MRI) and in radiopharmaceuticals for medical diagnosis and tumour therapy, H(4)dota, H(4)teta, H(8)dotp and H(8)tetp, is examined from a chemical point of view. Differences between 12- and 14-membered tetraazamacrocyclic derivatives with methylcarboxylate and methylphosphonate pendant arms and their chelates with divalent first-series transition metal and trivalent lanthanide ions are discussed on the basis of their thermodynamic stability constants, X-ray structures and theoretical studies.
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Affiliation(s)
- Rita Delgado
- Instituto de Tecnologia Química e Biológica, UNL, Apartado 127, 2781-901, Oeiras, Portugal.
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