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Facca VJ, Cai Z, Ku A, Georgiou CJ, Reilly RM. Adjuvant Auger Electron-Emitting Radioimmunotherapy with [ 111In]In-DOTA-Panitumumab in a Mouse Model of Local Recurrence and Metastatic Progression of Human Triple-Negative Breast Cancer. Mol Pharm 2023; 20:6407-6419. [PMID: 37983089 DOI: 10.1021/acs.molpharmaceut.3c00780] [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: 11/21/2023]
Abstract
Triple-negative breast cancer (TNBC) has a high risk for recurrence and metastasis. We studied the effectiveness of Auger electron (AE) radioimmunotherapy (RIT) with antiepidermal growth factor receptor (EGFR) panitumumab conjugated with DOTA complexed to 111In ([111In]In-DOTA-panitumumab) for preventing metastatic progression after local treatment of 231/LM2-4 Luc+ human TNBC tumors in the mammary fat pad of NRG mice. Prior to RIT, the primary tumor was resected, and tumor margins were treated with X-irradiation (XRT; 5 days × 6 Gy/d). RIT was administered 1 day post-XRT by intravenous injection of 26 MBq (15 μg) or 2 × 10 MBq (15 μg each) separated by 7 d. These treatments were compared to tumor resection with or without XRT combined with DOTA-panitumumab (15 μg) or irrelevant [111In]In-DOTA-IgG2 (24 MBq; 15 μg), and efficacy was evaluated by Kaplan-Meier survival curves. The effect of [111In]In-DOTA-panitumumab (23 MBq; 15 μg) after tumor resection without local XRT was also studied. Tumor resection followed by XRT and RIT with 26 MBq [111In]In-DOTA-panitumumab significantly increased the median survival to 35 d compared to tumor resection with or without XRT (23-24 d; P < 0.0001). Local treatment with tumor resection and XRT followed by 2 × 10 MBq of [111In]In-DOTA-panitumumab, DOTA-panitumumab, or [111In]In-DOTA-IgG2 did not significantly improve median survival (26 days for all treatments). RIT alone with [111In]In-DOTA-panitumumab postresection of the tumor without XRT increased median survival to 29 days, though this was not significant. Despite significantly improved survival in mice treated with tumor resection, XRT, and RIT with [111In]In-DOTA-panitumumab, all mice eventually succumbed to advanced metastatic disease by 45 d post-tumor resection. SPECT/CT with [111In]In-DOTA-panitumumab, PET/MRI with [64Cu]Cu-DOTA-panitumumab F(ab')2, and PET/CT with [18F]FDG were used to detect recurrent and metastatic disease. Uptake of [111In]In-DOTA-panitumumab at 4 d p.i. in the MFP tumor was 26.8 ± 9.7% ID/g and in metastatic lymph nodes (LN), lungs, and liver was 34.2 ± 26.9% ID/g, 17.5 ± 6.0% ID/g, and 9.4 ± 2.4%ID/g, respectively, while uptake in the lungs (6.0 ± 0.9% ID/g) and liver (5.2 ± 2.9% ID/g) of non-tumor-bearing NRG was significantly lower (P < 0.05). Radiation-absorbed doses in metastatic LN, lungs, and liver were 9.7 ± 6.1, 6.4 ± 2.1, and 10.9 ± 2.7 Gy, respectively. In conclusion, we demonstrated that RIT with [111In]In-DOTA-panitumumab combined with tumor resection and XRT significantly improved the survival of mice with recurrent TNBC. However, the aggressive nature of 231/LM2-4 Luc+ tumors in NRG mice may have contributed to the tumor recurrence and progression observed.
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Affiliation(s)
- Valerie J Facca
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College St., Toronto, Ontario M5S 3M2, Canada
| | - Zhongli Cai
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College St., Toronto, Ontario M5S 3M2, Canada
| | - Anthony Ku
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College St., Toronto, Ontario M5S 3M2, Canada
| | - Constantine J Georgiou
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College St., Toronto, Ontario M5S 3M2, Canada
| | - Raymond M Reilly
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College St., Toronto, Ontario M5S 3M2, Canada
- Department of Medical Imaging, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario M5S 1A8, Canada
- Joint Department of Medical Imaging and Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 2C1, Canada
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2
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Porret E, Kereselidze D, Dauba A, Schweitzer-Chaput A, Jegot B, Selingue E, Tournier N, Larrat B, Novell A, Truillet C. Refining the delivery and therapeutic efficacy of cetuximab using focused ultrasound in a mouse model of glioblastoma: An 89Zr-cetuximab immunoPET study. Eur J Pharm Biopharm 2023; 182:141-151. [PMID: 36529256 DOI: 10.1016/j.ejpb.2022.12.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 12/04/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022]
Abstract
INTRODUCTION Glioblastoma (GBM) is the most common and deadly form of primary brain tumor. Between 30 % and 60 % of GBM are characterized by overexpression of the Epidermal Growth Factor Receptor (EGFR). The anti-EGFR antibody Cetuximab (CTX) showed a favorable effect for EGFR+ colorectal cancer but failed to demonstrate efficacy for GBM. Insufficient CTX passage through the blood-brain barrier (BBB) and the blood-tumor barrier (BTB) is assumed to be the primary determinant of the limited efficacy of this immunotherapy. OBJECTIVE Using positron emission tomography (PET) imaging, we have previously demonstrated that focused ultrasound (FUS) combined with microbubbles (µB) allowed significant and persistent delivery of CTX across the BBB in healthy mice. In the current study, we investigated by PET imaging the combination impact of CTX and FUS on orthotopic GBM preclinical model. METHODS After radiolabeling CTX with the long half-life isotope 89Zr, PET images have been acquired overtime in mice bearing U251 (EGFR+) with or without FUS treatment. Autoradiography combined with immunofluorescence staining was used to corroborate CTX delivery with EGFR expression. A survival study was conducted simultaneously to evaluate the therapeutic benefit of repeated CTX monotherapy associated or not with FUS. RESULTS Ex vivo analysis confirmed that FUS enhanced and homogenized the delivery of CTX into all the FUS exposure area, including the tumor and the contralateral hemisphere at the early-time-point. Interestingly, FUS did not improve the long-term accumulation and retention of CTX in the tumor compared with the control group (no FUS). No significant difference in the CTX treatment efficacy, determined by the survival between FUS and non-FUS groups, has been either observed. This result is consistent with the absence of change in the CTX distribution through the GBM tumor after FUS. The neuroinflammation induced by FUS is not significant enough to explain the failure of the CTX delivery improvement. CONCLUSION All together, these data suggest that the role of FUS combined with µB on the CTX distribution, even after multiple therapeutic sessions and glial cell activation is insufficient to improve survival of GBM mice compared with CTX treatment alone in this model.
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Affiliation(s)
- Estelle Porret
- Université Paris-Saclay, CEA, CNRS, Inserm, BioMaps, Service Hospitalier Frédéric Joliot, 4 place du général Leclerc, 91401 Orsay, France
| | - Dimitri Kereselidze
- Université Paris-Saclay, CEA, CNRS, Inserm, BioMaps, Service Hospitalier Frédéric Joliot, 4 place du général Leclerc, 91401 Orsay, France
| | - Ambre Dauba
- Université Paris-Saclay, CEA, CNRS, Inserm, BioMaps, Service Hospitalier Frédéric Joliot, 4 place du général Leclerc, 91401 Orsay, France
| | - Arnaud Schweitzer-Chaput
- Université Paris-Saclay, CEA, CNRS, Inserm, BioMaps, Service Hospitalier Frédéric Joliot, 4 place du général Leclerc, 91401 Orsay, France
| | - Benoit Jegot
- Université Paris-Saclay, CEA, CNRS, Inserm, BioMaps, Service Hospitalier Frédéric Joliot, 4 place du général Leclerc, 91401 Orsay, France
| | - Erwan Selingue
- Université Paris-Saclay, CEA, CNRS, NeuroSpin/BAOBAB, Centre d'études de Saclay, Bâtiment 145, 91191 Gif sur Yvette, France
| | - Nicolas Tournier
- Université Paris-Saclay, CEA, CNRS, Inserm, BioMaps, Service Hospitalier Frédéric Joliot, 4 place du général Leclerc, 91401 Orsay, France
| | - Benoît Larrat
- Université Paris-Saclay, CEA, CNRS, NeuroSpin/BAOBAB, Centre d'études de Saclay, Bâtiment 145, 91191 Gif sur Yvette, France
| | - Anthony Novell
- Université Paris-Saclay, CEA, CNRS, Inserm, BioMaps, Service Hospitalier Frédéric Joliot, 4 place du général Leclerc, 91401 Orsay, France
| | - Charles Truillet
- Université Paris-Saclay, CEA, CNRS, Inserm, BioMaps, Service Hospitalier Frédéric Joliot, 4 place du général Leclerc, 91401 Orsay, France.
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Kolesar J, Peh S, Thomas L, Baburaj G, Mukherjee N, Kantamneni R, Lewis S, Pai A, Udupa KS, Kumar An N, Rangnekar VM, Rao M. Integration of liquid biopsy and pharmacogenomics for precision therapy of EGFR mutant and resistant lung cancers. Mol Cancer 2022; 21:61. [PMID: 35209919 PMCID: PMC8867675 DOI: 10.1186/s12943-022-01534-8] [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: 11/30/2021] [Accepted: 02/07/2022] [Indexed: 11/22/2022] Open
Abstract
The advent of molecular profiling has revolutionized the treatment of lung cancer by comprehensively delineating the genomic landscape of the epidermal growth factor receptor (EGFR) gene. Drug resistance caused by EGFR mutations and genetic polymorphisms of drug metabolizing enzymes and transporters impedes effective treatment of EGFR mutant and resistant lung cancer. This review appraises current literature, opportunities, and challenges associated with liquid biopsy and pharmacogenomic (PGx) testing as precision therapy tools in the management of EGFR mutant and resistant lung cancers. Liquid biopsy could play a potential role in selection of precise tyrosine kinase inhibitor (TKI) therapies during different phases of lung cancer treatment. This selection will be based on the driver EGFR mutational status, as well as monitoring the development of potential EGFR mutations arising during or after TKIs treatment, since some of these new mutations may be druggable targets for alternative TKIs. Several studies have identified the utility of liquid biopsy in the identification of EGFR driver and acquired resistance with good sensitivities for various blood-based biomarkers. With a plethora of sequencing technologies and platforms available currently, further evaluations using randomized controlled trials (RCTs) in multicentric, multiethnic and larger patient cohorts could enable optimization of liquid-based assays for the detection of EGFR mutations, and support testing of CYP450 enzymes and drug transporter polymorphisms to guide precise dosing of EGFR TKIs.
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Affiliation(s)
- Jill Kolesar
- Department of Pharmacy Practice & Science, University of Kentucky, Lexington, KY, 40536, USA
| | - Spencer Peh
- Department of Pharmacy Practice & Science, University of Kentucky, Lexington, KY, 40536, USA
| | - Levin Thomas
- Department of Pharmacy Practice, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Gayathri Baburaj
- Department of Pharmacy Practice, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Nayonika Mukherjee
- Department of Pharmacy Practice, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Raveena Kantamneni
- Department of Pharmacy Practice, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Shirley Lewis
- Department of Radiotherapy and Oncology, Kasturba Medical College, Manipal Comprehensive Cancer Care Centre, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Ananth Pai
- Department of Medical Oncology, Kasturba Medical College, Manipal Comprehensive Cancer Care Centre, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Karthik S Udupa
- Department of Medical Oncology, Kasturba Medical College, Manipal Comprehensive Cancer Care Centre, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Naveena Kumar An
- Department of Surgical Oncology, Kasturba Medical College, Manipal Comprehensive Cancer Care Centre, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Vivek M Rangnekar
- Markey Cancer Centre and Department of Radiation Medicine, University of Kentucky, Lexington, KY, 40536, USA
| | - Mahadev Rao
- Department of Pharmacy Practice, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India.
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Spiegelberg D, Stenberg J, Richalet P, Vanhove M. K D determination from time-resolved experiments on live cells with LigandTracer and reconciliation with end-point flow cytometry measurements. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2021; 50:979-991. [PMID: 34302187 PMCID: PMC8448686 DOI: 10.1007/s00249-021-01560-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 06/16/2021] [Accepted: 07/01/2021] [Indexed: 11/30/2022]
Abstract
Design of next-generation therapeutics comes with new challenges and emulates technology and methods to meet them. Characterizing the binding of either natural ligands or therapeutic proteins to cell-surface receptors, for which relevant recombinant versions may not exist, represents one of these challenges. Here we report the characterization of the interaction of five different antibody therapeutics (Trastuzumab, Rituximab, Panitumumab, Pertuzumab, and Cetuximab) with their cognate target receptors using LigandTracer. The method offers the advantage of being performed on live cells, alleviating the need for a recombinant source of the receptor. Furthermore, time-resolved measurements, in addition to allowing the determination of the affinity of the studied drug to its target, give access to the binding kinetics thereby providing a full characterization of the system. In this study, we also compared time-resolved LigandTracer data with end-point KD determination from flow cytometry experiments and hypothesize that discrepancies between these two approaches, when they exist, generally come from flow cytometry titration curves being acquired prior to full equilibration of the system. Our data, however, show that knowledge of the kinetics of the interaction allows to reconcile the data obtained by flow cytometry and LigandTracer and demonstrate the complementarity of these two methods.
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Affiliation(s)
- Diana Spiegelberg
- Department of Surgical Sciences, Uppsala University, 751 85, Uppsala, Sweden
| | - Jonas Stenberg
- Ridgeview Instruments AB, Skillsta 4, 740 20, Vänge, Sweden.,A3P Biomedical AB, Vallongatan 1, 752 28, Uppsala, Sweden
| | | | - Marc Vanhove
- Marc Vanhove Consultancy, 4100, Boncelles, Belgium. .,Oxurion N.V., Gaston Geenslaan 1, 3001, Leuven, Belgium.
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Audia A, Bannish G, Bunting R, Riveley C. Flow cytometry and receptor occupancy in immune-oncology. Expert Opin Biol Ther 2021; 22:87-94. [PMID: 34139906 DOI: 10.1080/14712598.2021.1944098] [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: 10/21/2022]
Abstract
Introduction: Immunotherapies are focused on strategies that alter immune responses, using antibodies that binds to receptors on different immune cell subsets and either activate or suppress their functions depending on the immune response being targeted. Hence, the necessity of developing assays that assess the functional and biological effect of a therapeutic on its target. When incorporated into high-parameter flow cytometry panels, receptor occupancy assay can simultaneously evaluate receptor expression and drug occupancy on defined cell subsets, which can provide information related to functional effects, and safety.Areas covered: This review focuses on the importance of developing, optimizing, and validating a robust Receptor Occupancy Assay (ROA) to improve dose selection, pharmacology monitoring and safety mainly in clinical settings.Expert opinion: The designing of an ROA can be challenging and can lead to exaggerated pharmacology if not accurately developed, optimized, and validated. However, improvements in our understanding of epitopes, binding, affinities, and pharmacological effects may lead to improved antibody drug targeting and receptor evaluation.
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Affiliation(s)
- Alessandra Audia
- Champions Oncology, Biomarker Services Solution, Hackensack, New Jersey, USA
| | - Gregory Bannish
- Champions Oncology, Biomarker Services Solution, Hackensack, New Jersey, USA
| | - Rachel Bunting
- Champions Oncology, Biomarker Services Solution, Hackensack, New Jersey, USA
| | - Chelsea Riveley
- Champions Oncology, Biomarker Services Solution, Hackensack, New Jersey, USA
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Kast J, Dutta S, Upreti VV. Panitumumab: A Review of Clinical Pharmacokinetic and Pharmacology Properties After Over a Decade of Experience in Patients with Solid Tumors. Adv Ther 2021; 38:3712-3723. [PMID: 34152568 DOI: 10.1007/s12325-021-01809-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 05/26/2021] [Indexed: 01/05/2023]
Abstract
Panitumumab is a fully human monoclonal antibody that binds to the epidermal growth factor receptor (EGFR), thereby inhibiting the growth and survival of tumors expressing EGFR. Panitumumab received approval in the USA in 2006 for the treatment of wild-type RAS (defined as wild-type in both KRAS and NRAS) metastatic colorectal cancer. Over the last 10 years, the pharmacokinetic and pharmacodynamic profile of panitumumab has been studied to further evaluate its safety, efficacy, and optimal dosing regimen. In this review, we summarize the key clinical pharmacokinetic and pharmacology data for panitumumab, and considerations for its use in special populations. Panitumumab has a nonlinear pharmacokinetic profile and its approved dosing regimen (6 mg/kg every 2 weeks) is based on body weight; dose adjustments are not needed based on sex, age, or renal or hepatic impairment. Drug interactions do not occur when panitumumab is combined with chemotherapy drugs including irinotecan, paclitaxel, and carboplatin. The level of tumor EGFR expression was found to have no effect on panitumumab pharmacokinetics or efficacy. The incidence of anti-panitumumab antibodies is low; when anti-panitumumab antibodies are produced, they do not affect the efficacy, safety, or pharmacokinetics of panitumumab. In summary, the pharmacokinetic and pharmacodynamic profile of panitumumab is well suited for standard dosing, and the approved body weight-based dosing regimen maintains efficacy and safety in the treatment of wild-type RAS metastatic colorectal cancer across a broad range of patients.
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Tang Y, Li X, Cao Y. Which factors matter the most? Revisiting and dissecting antibody therapeutic doses. Drug Discov Today 2021; 26:1980-1990. [PMID: 33895315 DOI: 10.1016/j.drudis.2021.04.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 02/28/2021] [Accepted: 04/16/2021] [Indexed: 01/22/2023]
Abstract
Factors such as antibody clearance and target affinity can influence antibodies' effective doses for specific indications. However, these factors vary considerably across antibody classes, precluding direct and quantitative comparisons. Here, we apply a dimensionless metric, the therapeutic exposure affinity ratio (TEAR), which normalizes the therapeutic doses by antibody bioavailability, systemic clearance and target-binding property to enable direct and quantitative comparisons of therapeutic doses. Using TEAR, we revisited and dissected the doses of up to 60 approved antibodies. We failed to detect a significant influence of target baselines, turnovers or anatomical locations on antibody therapeutic doses, challenging the traditional perceptions. We highlight the importance of antibodies' modes of action for therapeutic doses and dose selections; antibodies that work through neutralizing soluble targets show higher TEARs than those working through other mechanisms. Overall, our analysis provides insights into the factors that influence antibody doses, and the factors that are crucial for antibodies' pharmacological effects.
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Affiliation(s)
- Yu Tang
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Xiaobing Li
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Department of Pharmacy, Shengjing Hospital of China Medical University, Shenyang, China
| | - Yanguang Cao
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
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8
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Lu G, Fakurnejad S, Martin BA, van den Berg NS, van Keulen S, Nishio N, Zhu AJ, Chirita SU, Zhou Q, Gao RW, Kong CS, Fischbein N, Penta M, Colevas AD, Rosenthal EL. Predicting Therapeutic Antibody Delivery into Human Head and Neck Cancers. Clin Cancer Res 2020; 26:2582-2594. [PMID: 31980465 DOI: 10.1158/1078-0432.ccr-19-3717] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 12/20/2019] [Accepted: 01/21/2020] [Indexed: 11/16/2022]
Abstract
PURPOSE The efficacy of antibody-based therapeutics depends on successful drug delivery into solid tumors; therefore, there is a clinical need to measure intratumoral antibody distribution. This study aims to develop and validate an imaging and computation platform to directly quantify and predict antibody delivery into human head and neck cancers in a clinical study. EXPERIMENTAL DESIGN Twenty-four patients received systemic infusion of a near-infrared fluorescence-labeled therapeutic antibody followed by surgical tumor resection. A computational platform was developed to quantify the extent of heterogeneity of intratumoral antibody distribution. Both univariate and multivariate regression analyses were used to select the most predictive tumor biological factors for antibody delivery. Quantitative image features from the pretreatment MRI were extracted and correlated with fluorescence imaging of antibody delivery. RESULTS This study not only confirmed heterogeneous intratumoral antibody distribution in-line with many preclinical reports, but also quantified the extent of interpatient, intertumor, and intratumor heterogeneity of antibody delivery. This study demonstrated the strong predictive value of tumor size for intratumoral antibody accumulation and its significant impact on antibody distribution in both primary tumor and lymph node metastasis. Furthermore, this study established the feasibility of using contrast-enhanced MRI to predict antibody delivery. CONCLUSIONS This study provides a clinically translatable platform to measure antibody delivery into solid tumors and yields valuable insight into clinically relevant antibody tumor penetration, with implications in the selection of patients amenable to antibody therapy and the design of more effective dosing strategies.
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Affiliation(s)
- Guolan Lu
- Department of Otolaryngology - Head and Neck Surgery, Stanford University School of Medicine, Stanford, California
| | | | - Brock A Martin
- Department of Pathology, Stanford University School of Medicine, Stanford, California
| | - Nynke S van den Berg
- Department of Otolaryngology - Head and Neck Surgery, Stanford University School of Medicine, Stanford, California
| | - Stan van Keulen
- Department of Otolaryngology - Head and Neck Surgery, Stanford University School of Medicine, Stanford, California
| | - Naoki Nishio
- Department of Otolaryngology - Head and Neck Surgery, Stanford University School of Medicine, Stanford, California
| | - Ashley J Zhu
- Department of Otolaryngology - Head and Neck Surgery, Stanford University School of Medicine, Stanford, California
| | - Stefania U Chirita
- Department of Otolaryngology - Head and Neck Surgery, Stanford University School of Medicine, Stanford, California
| | - Quan Zhou
- Department of Otolaryngology - Head and Neck Surgery, Stanford University School of Medicine, Stanford, California
| | - Rebecca W Gao
- Stanford University School of Medicine, Stanford, California
| | - Christina S Kong
- Department of Pathology, Stanford University School of Medicine, Stanford, California
| | - Nancy Fischbein
- Department of Radiology, Stanford University School of Medicine, Stanford, California
| | - Mrudula Penta
- Department of Radiology, Stanford University School of Medicine, Stanford, California
| | - Alexander D Colevas
- Department of Medicine, Division of Oncology, Stanford University School of Medicine, Stanford, California
| | - Eben L Rosenthal
- Department of Otolaryngology - Head and Neck Surgery, Stanford University School of Medicine, Stanford, California. .,Department of Radiology, Stanford University School of Medicine, Stanford, California
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A Bioluminescence Resonance Energy Transfer-Based Approach for Determining Antibody-Receptor Occupancy In Vivo. iScience 2019; 15:439-451. [PMID: 31121469 PMCID: PMC6529791 DOI: 10.1016/j.isci.2019.05.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 02/18/2019] [Accepted: 05/03/2019] [Indexed: 12/31/2022] Open
Abstract
Elucidating receptor occupancy (RO) of monoclonal antibodies (mAbs) is a crucial step in characterizing the therapeutic efficacy of mAbs. However, the in vivo assessment of RO, particularly within peripheral tissues, is greatly limited by current technologies. In the present study, we developed a bioluminescence resonance energy transfer (BRET)-based system that leverages the large signal:noise ratio and stringent energy donor-acceptor distance dependency to measure antibody RO in a highly selective and temporal fashion. This versatile and minimally invasive system enables longitudinal monitoring of the in vivo antibody-receptor engagement over several days. As a proof of principle, we quantified cetuximab-epidermal growth factor receptor binding kinetics using this system and assessed cetuximab RO in a tumor xenograft model. Incomplete ROs were observed, even at a supratherapeutic dose of 50 mg/kg, indicating that fractional target accessibility is achieved. The BRET-based imaging approach enables quantification of antibody in vivo RO and provides critical information required to optimize therapeutic mAb efficacy. Nano-BRET was used to longitudinally quantify cetuximab-binding kinetics to EGFR Incomplete EGFR occupancy in solid tumors was observed even at supratherapeutic doses A kinetic disassociation exists between plasma antibody and bound targets in tumors
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A Novel Anti-EGFR mAb Ame55 with Lower Toxicity and Better Efficacy than Cetuximab When Combined with Irinotecan. J Immunol Res 2019; 2019:3017360. [PMID: 30733972 PMCID: PMC6348820 DOI: 10.1155/2019/3017360] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 09/04/2018] [Accepted: 10/17/2018] [Indexed: 11/25/2022] Open
Abstract
To improve efficacy and minimize toxicity of EGFR inhibition treatment, we developed Ame55, a novel anti-EGFR IgG1 with lower affinity to EGFR than cetuximab (C225) from a human phage library. Ame55 had lower bioactivity than cetuximab in vitro but similar antitumor efficacy as cetuximab in vivo. Moreover, Ame55 was more efficacious than cetuximab in a Lovo cell xenograft tumor model when combined with irinotecan (CPT-11). Ame55 concentrates in the mouse xenograft tumor and has less toxicity than cetuximab in cynomolgus monkeys in an overdose study.
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11
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Milenic DE, Kim YS, Baidoo KE, Wong KJ, Barkley R, Delgado J, Brechbiel MW. Exploration of a F(ab') 2 Fragment as the Targeting Agent of α-Radiation Therapy: A Comparison of the Therapeutic Benefit of Intraperitoneal and Intravenous Administered Radioimmunotherapy. Cancer Biother Radiopharm 2018; 33:182-193. [PMID: 29916748 DOI: 10.1089/cbr.2018.2434] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Refinement of treatment regimens enlisting targeted α-radiation therapy (TAT) is an ongoing effort. Among the variables to consider are the target molecule, radionuclide, dosage, and administration route. The panitumumab F(ab')2 fragment targeting epidermal growth factor receptor tolerated modification with the TCMC chelate as well as radiolabeling with 203Pb or 212Pb. Good specific activity was attained when the immunoconjugate was labeled with 212Pb (9.6 ± 1.4 mCi/mg). Targeting of LS-174T tumor xenografts with the 203Pb-panitumumab F(ab')2 demonstrated comparable amounts of uptake to the similarly radiolabeled panitumumab IgG. A dose escalation study was performed to determine an effective working dose for both intraperitoneal (i.p.) and intravenous (i.v.) injections of 212Pb-panitumumab F(ab')2. Therapeutic efficacy, with modest toxicity, was observed with 30 μCi given i.p. Results for the i.v. administration were not as definitive and the experiment was repeated with a higher dose range. From this study, 20 μCi given i.v. was selected as the effective working dose. A subsequent therapy study combined gemcitabine or paclitaxel with i.v. 212Pb-panitumumab F(ab')2, which increased the median survival (MS) of LS-174T tumor-bearing mice to 208 and 239 d, respectively. Meanwhile, the MS of mice treated with i.v. 212Pb-panitumumab F(ab')2 alone was 61 and 11 d for the untreated group of mice. In conclusion, the panitumumab F(ab')2 fragment whether given by i.p. or i.v. injection, is a viable candidate as a delivery vector for TAT of disseminated i.p. disease.
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Affiliation(s)
- Diane E Milenic
- 1 Radioimmune and Inorganic Chemistry Section, Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health , Bethesda, Maryland
| | - Young-Seung Kim
- 1 Radioimmune and Inorganic Chemistry Section, Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health , Bethesda, Maryland
| | - Kwamena E Baidoo
- 1 Radioimmune and Inorganic Chemistry Section, Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health , Bethesda, Maryland
| | - Karen J Wong
- 2 Molecular Imaging Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health , Bethesda, Maryland
| | - Rachel Barkley
- 1 Radioimmune and Inorganic Chemistry Section, Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health , Bethesda, Maryland
| | - Jose Delgado
- 1 Radioimmune and Inorganic Chemistry Section, Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health , Bethesda, Maryland
| | - Martin W Brechbiel
- 1 Radioimmune and Inorganic Chemistry Section, Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health , Bethesda, Maryland
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12
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Glatt DM, Beckford Vera DR, Prabhu SS, Mumper RJ, Luft JC, Benhabbour SR, Parrott MC. Synthesis and Characterization of Cetuximab-Docetaxel and Panitumumab-Docetaxel Antibody-Drug Conjugates for EGFR-Overexpressing Cancer Therapy. Mol Pharm 2018; 15:5089-5102. [PMID: 30226780 DOI: 10.1021/acs.molpharmaceut.8b00672] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The safety and efficacy of anticancer antibody-drug conjugates (ADCs) depend on the selection of tumor-targeting monoclonal antibody (mAb), linker, and drug, as well as their specific chemical arrangement and linkage chemistry. In this study, we used a heterobifunctional cross-linker to conjugate docetaxel (DX) to cetuximab (CET) or panitumumab (PAN). The resulting ADCs were investigated for their in vitro EGFR-specific cytotoxicity and in vivo anticancer activity. Reaction conditions, such as reducing agent, time, temperature, and alkylation buffer, were optimized to yield potent and stable ADCs with consistent batch-to-batch drug-to-antibody ratios (DARs). ADCs were synthesized with DARs from 0.4 to 3.0, and all retained their EGFR affinity and specificity after modification. ADCs were sensitive to cell surface wildtype EGFR expression, demonstrating more cytotoxicity in EGFR-expressing A431 and MDA-MB-231 cell lines compared to U87MG cells. A431 tumor-bearing mice treated once weekly for four weeks with 100 mg/kg cetuximab-docetaxel ADC (C-SC-DX, DAR 2.5) showed durable anticancer responses and improved overall survival compared to the same treatment regimen with 1 mg/kg DX, 100 mg/kg CET, or a combination 1 mg/kg DX and 100 mg/kg CET. New treatment options are emerging for patients with both wild-type and mutated EGFR-overexpressing cancers, and these studies highlight the potential role of EGFR-targeted ADC therapies as a promising new treatment option.
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Affiliation(s)
- Dylan M Glatt
- Division of Pharmacoengineering and Molecular Pharmaceutics, UNC Eshelman School of Pharmacy , University of North Carolina at Chapel Hill , 125 Mason Farm Road , Chapel Hill , North Carolina 27599 , United States
| | - Denis R Beckford Vera
- Department of Radiology, Biomedical Research Imaging Center , University of North Carolina at Chapel Hill , Marsico Hall, 125 Mason Farm Road , Chapel Hill , North Carolina 27599 , United States
| | - Shamit S Prabhu
- Division of Pharmacoengineering and Molecular Pharmaceutics, UNC Eshelman School of Pharmacy , University of North Carolina at Chapel Hill , 125 Mason Farm Road , Chapel Hill , North Carolina 27599 , United States
| | - Russell J Mumper
- Division of Pharmacoengineering and Molecular Pharmaceutics, UNC Eshelman School of Pharmacy , University of North Carolina at Chapel Hill , 125 Mason Farm Road , Chapel Hill , North Carolina 27599 , United States
| | - J Christopher Luft
- Division of Pharmacoengineering and Molecular Pharmaceutics, UNC Eshelman School of Pharmacy , University of North Carolina at Chapel Hill , 125 Mason Farm Road , Chapel Hill , North Carolina 27599 , United States
| | - S Rahima Benhabbour
- Division of Pharmacoengineering and Molecular Pharmaceutics, UNC Eshelman School of Pharmacy , University of North Carolina at Chapel Hill , 125 Mason Farm Road , Chapel Hill , North Carolina 27599 , United States.,UNC-NCSU Joint Department of Biomedical Engineering , University of North Carolina at Chapel Hill , Marsico Hall, 125 Mason Farm Road , Chapel Hill , North Carolina 27599 , United States
| | - Matthew C Parrott
- Department of Radiology, Biomedical Research Imaging Center , University of North Carolina at Chapel Hill , Marsico Hall, 125 Mason Farm Road , Chapel Hill , North Carolina 27599 , United States
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13
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Deonarain MP, Yahioglu G, Stamati I, Pomowski A, Clarke J, Edwards BM, Diez-Posada S, Stewart AC. Small-Format Drug Conjugates: A Viable Alternative to ADCs for Solid Tumours? Antibodies (Basel) 2018; 7:E16. [PMID: 31544868 PMCID: PMC6698822 DOI: 10.3390/antib7020016] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 03/07/2018] [Accepted: 03/08/2018] [Indexed: 12/16/2022] Open
Abstract
Antibody-Drug Conjugates (ADCs) have been through multiple cycles of technological innovation since the concept was first practically demonstrated ~40 years ago. Current technology is focusing on large, whole immunoglobulin formats (of which there are approaching 100 in clinical development), many with site-specifically conjugated payloads numbering 2 or 4. Despite the success of trastuzumab-emtansine in breast cancer, ADCs have generally failed to have an impact in solid tumours, leading many to explore alternative, smaller formats which have better penetrating properties as well as more rapid pharmacokinetics (PK). This review describes research and development progress over the last ~10 years obtained from the primary literature or conferences covering over a dozen different smaller format-drug conjugates from 80 kDa to around 1 kDa in total size. In general, these agents are potent in vitro, particularly more recent ones incorporating ultra-potent payloads such as auristatins or maytansinoids, but this potency profile changes when testing in vivo due to the more rapid clearance. Strategies to manipulate the PK properties, whilst retaining the more effective tumour penetrating properties could at last make small-format drug conjugates viable alternative therapeutics to the more established ADCs.
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Affiliation(s)
- Mahendra P Deonarain
- Antikor Biopharma Ltd., Stevenage Bioscience Catalyst, Gunnels Wood Road, Stevenage Herts SG12FX, UK.
- Department of Chemistry, Imperial College London, Exhibition Road, London SW72AZ, UK.
| | - Gokhan Yahioglu
- Antikor Biopharma Ltd., Stevenage Bioscience Catalyst, Gunnels Wood Road, Stevenage Herts SG12FX, UK.
- Department of Chemistry, Imperial College London, Exhibition Road, London SW72AZ, UK.
| | - Ioanna Stamati
- Antikor Biopharma Ltd., Stevenage Bioscience Catalyst, Gunnels Wood Road, Stevenage Herts SG12FX, UK.
| | - Anja Pomowski
- Antikor Biopharma Ltd., Stevenage Bioscience Catalyst, Gunnels Wood Road, Stevenage Herts SG12FX, UK.
| | - James Clarke
- Antikor Biopharma Ltd., Stevenage Bioscience Catalyst, Gunnels Wood Road, Stevenage Herts SG12FX, UK.
| | - Bryan M Edwards
- Antikor Biopharma Ltd., Stevenage Bioscience Catalyst, Gunnels Wood Road, Stevenage Herts SG12FX, UK.
| | - Soraya Diez-Posada
- Antikor Biopharma Ltd., Stevenage Bioscience Catalyst, Gunnels Wood Road, Stevenage Herts SG12FX, UK.
| | - Ashleigh C Stewart
- Antikor Biopharma Ltd., Stevenage Bioscience Catalyst, Gunnels Wood Road, Stevenage Herts SG12FX, UK.
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14
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Durbin KR, Phipps C, Liao X. Mechanistic Modeling of Antibody-Drug Conjugate Internalization at the Cellular Level Reveals Inefficient Processing Steps. Mol Cancer Ther 2018; 17:1341-1351. [PMID: 29592884 DOI: 10.1158/1535-7163.mct-17-0672] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 10/30/2017] [Accepted: 03/19/2018] [Indexed: 11/16/2022]
Abstract
Antibody-drug conjugates (ADC) offer an avenue for specific drug delivery to target cells. Here, parameters with important roles in the cellular processing of ADCs were quantitatively measured for Ab033, an antibody against EGFR. In EGFR-overexpressing cancer cell lines, Ab033 internalized at rates of 0.047/min and 0.15/min for A431 and H441 cells, respectively. Once internalized, Ab033 either trafficked to the lysosome or was recycled; up to 45% of internalized Ab033 returned to the cell surface. Despite such recycling, intracellular accumulation of Ab033 continually increased over 24 hours. Ab033 was conjugated to form a dual toxin ADC containing both cleavable and non-cleavable linker-drug payloads for release rate comparisons. Intracellular concentrations of freed drug from cleavable linker were greater than from non-cleavable linker and exceeded 5 × 106 drug molecules per A431 cell after 24 hours. Compared with intracellular antibody accumulation, formation of released drug was delayed, likely due to the time needed for endo-lysosomal trafficking and subsequent linker/antibody proteolysis. Informed by the quantitative data, a cellular ADC model was constructed and used to summarize processing inefficiencies. Modeling simulations were conducted to determine parameter sensitivity on intracellular drug concentrations, with rates of EGFR internalization and recycling as well as ADC trafficking found to be the most sensitive toward final intracellular drug concentrations. Overall, this study shows Ab033 ADCs to be a viable strategy for delivery of cytotoxic drugs into tumor cells with subsequent modeling efforts able to highlight key processing steps to be improved for increased drug delivery. Mol Cancer Ther; 17(6); 1341-51. ©2018 AACR.
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Affiliation(s)
- Kenneth R Durbin
- Department of Drug Metabolism and Pharmacokinetics, AbbVie, Inc., North Chicago, Illinois.
| | - Colin Phipps
- Department of Drug Metabolism and Pharmacokinetics, AbbVie, Inc., North Chicago, Illinois
| | - Xiaoli Liao
- Process R&D Department, AbbVie, Inc., North Chicago, Illinois
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15
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Stewart JJ, Green CL, Jones N, Liang M, Xu Y, Wilkins DEC, Moulard M, Czechowska K, Lanham D, McCloskey TW, Ferbas J, van der Strate BWA, Högerkorp CM, Wyant T, Lackey A, Litwin V. Role of receptor occupancy assays by flow cytometry in drug development. CYTOMETRY PART B-CLINICAL CYTOMETRY 2016; 90:110-6. [DOI: 10.1002/cyto.b.21355] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 11/18/2015] [Accepted: 12/18/2015] [Indexed: 12/12/2022]
Affiliation(s)
| | | | - Nicholas Jones
- LabCorp Clinical Trials, Laboratory Corporation of America Holdings; Brentwood Tennessee 37027
| | - Meina Liang
- Medimmune, LLC; Mountain View California 94043
| | - Yuanxin Xu
- Alnylam Pharmaceuticals; Cambridge Massachusetts 02142
| | | | | | | | - David Lanham
- Eurofins Pharma Bioanalysis Services UK Limited; Park Abingdon OX14 4RY United Kingdom
| | | | | | | | | | - Timothy Wyant
- Takeda Pharmaceuticals; Cambridge Massachusetts 02139
| | - Alan Lackey
- LabCorp Clinical Trials, Laboratory Corporation of America Holdings; Brentwood Tennessee 37027
| | - Virginia Litwin
- Covance Central Laboratory Services; Indianapolis Indiana 46214
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16
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Moulard M, Ozoux ML. How validated receptor occupancy flow cytometry assays can impact decisions and support drug development. CYTOMETRY PART B-CLINICAL CYTOMETRY 2015; 90:150-8. [PMID: 26332593 DOI: 10.1002/cyto.b.21320] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 07/15/2015] [Accepted: 08/25/2015] [Indexed: 12/15/2022]
Abstract
Because of the pressure of significant attrition in drug development, demonstration of target engagement after drug administration enables dose and regimen optimization, patient selection, and stratification from the earliest stages of drug development. The determination of receptor occupancy (RO) can support these efforts. Flow cytometry is one of the preferred technologies to be used based on the important advances in the technology over the last years enabling the simultaneous determination on target cells, of multi intra or surface cell parameters with adequate precision in a regulated environment. Nevertheless, compared to other platforms using the same antigen-antibody binding concept, the flow cytometry approach has faced several challenges, not only due to the technology per se and the diversity of receptor occupancy approaches, but also related to the nature of the matrix where the determination is performed. To illustrate these points, three case studies (antibody-drug conjugate and naked antibody) are provided here to highlight the importance of the choice of the right antibody pair to measure both receptor density (RD) and occupancy by the drug on cancer cells in blood and in bone marrow and the possibility to circumvent the lack of a critical reagent with an innovative approach. In addition, the use of RO data to determine the minimum anticipated biological effect level (MABEL) with translational data from preclinical to human studies, selection of starting dose for the first in man study will be discussed.
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Affiliation(s)
| | - Marie-Laure Ozoux
- Sanofi-Aventis Recherche et Développement, DSAR, Head of Biomarkers and Biological Analyses, Vitry-sur-Seine, France
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17
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Femminella M, Reali G, Vasilakos AV. A Molecular Communications Model for Drug Delivery. IEEE Trans Nanobioscience 2015; 14:935-45. [PMID: 26529770 DOI: 10.1109/tnb.2015.2489565] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
This paper considers the scenario of a targeted drug delivery system, which consists of deploying a number of biological nanomachines close to a biological target (e.g., a tumor), able to deliver drug molecules in the diseased area. Suitably located transmitters are designed to release a continuous flow of drug molecules in the surrounding environment, where they diffuse and reach the target. These molecules are received when they chemically react with compliant receptors deployed on the receiver surface. In these conditions, if the release rate is relatively high and the drug absorption time is significant, congestion may happen, essentially at the receiver site. This phenomenon limits the drug absorption rate and makes the signal transmission ineffective, with an undesired diffusion of drug molecules elsewhere in the body. The original contribution of this paper consists of a theoretical analysis of the causes of congestion in diffusion-based molecular communications. For this purpose, it is proposed a reception model consisting of a set of pure loss queuing systems. The proposed model exhibits an excellent agreement with the results of a simulation campaign made by using the Biological and Nano-Scale communication simulator version 2 (BiNS2), a well-known simulator for molecular communications, whose reliability has been assessed through in vitro experiments. The obtained results can be used in rate control algorithms to optimally determine the optimal release rate of molecules in drug delivery applications.
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18
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Liang M, Schwickart M, Schneider AK, Vainshtein I, Del Nagro C, Standifer N, Roskos LK. Receptor occupancy assessment by flow cytometry as a pharmacodynamic biomarker in biopharmaceutical development. CYTOMETRY PART B-CLINICAL CYTOMETRY 2015; 90:117-27. [PMID: 26054054 PMCID: PMC5042057 DOI: 10.1002/cyto.b.21259] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 04/20/2015] [Accepted: 05/28/2015] [Indexed: 12/19/2022]
Abstract
Receptor occupancy (RO) assays are designed to quantify the binding of therapeutics to their targets on the cell surface and are frequently used to generate pharmacodynamic (PD) biomarker data in nonclinical and clinical studies of biopharmaceuticals. When combined with the pharmacokinetic (PK) profile, RO data can establish PKPD relationships, which are crucial for informing dose decisions. RO is commonly measured by flow cytometry on fresh blood specimens and is subject to numerous technical and logistical challenges. To ensure that reliable and high quality results are generated from RO assays, careful assay design, key reagent characterization, data normalization/reporting, and thorough planning for implementation are of critical importance during development. In this article, the authors share their experiences and perspectives in these areas and discuss challenges and potential solutions when developing and implementing a flow cytometry‐based RO method in support of biopharmaceutical drug development. © 2015 The Authors Cytometry Part B: Clinical Cytometry Published by Wiley Periodicals, Inc.
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Affiliation(s)
- Meina Liang
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Martin Schwickart
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Amy K Schneider
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Inna Vainshtein
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Christopher Del Nagro
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Nathan Standifer
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Lorin K Roskos
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
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19
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Antigen specificity can be irrelevant to immunocytokine efficacy and biodistribution. Proc Natl Acad Sci U S A 2015; 112:3320-5. [PMID: 25733854 DOI: 10.1073/pnas.1416159112] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Cytokine therapy can activate potent, sustained antitumor responses, but collateral toxicity often limits dosages. Although antibody-cytokine fusions (immunocytokines) have been designed with the intent to localize cytokine activity, systemic dose-limiting side effects are not fully ameliorated by attempted tumor targeting. Using the s.c. B16F10 melanoma model, we found that a nontoxic dose of IL-2 immunocytokine synergized with tumor-specific antibody to significantly enhance therapeutic outcomes compared with immunocytokine monotherapy, concomitant with increased tumor saturation and intratumoral cytokine responses. Examination of cell subset biodistribution showed that the immunocytokine associated mainly with IL-2R-expressing innate immune cells, with more bound immunocytokine present in systemic organs than the tumor microenvironment. More surprisingly, immunocytokine antigen specificity and Fcγ receptor interactions did not seem necessary for therapeutic efficacy or biodistribution patterns because immunocytokines with irrelevant specificity and/or inactive mutant Fc domains behaved similarly to tumor-specific immunocytokine. IL-2-IL-2R interactions, rather than antibody-antigen targeting, dictated immunocytokine localization; however, the lack of tumor targeting did not preclude successful antibody combination therapy. Mathematical modeling revealed immunocytokine size as another driver of antigen targeting efficiency. This work presents a safe, straightforward strategy for augmenting immunocytokine efficacy by supplementary antibody dosing and explores underappreciated factors that can subvert efforts to purposefully alter cytokine biodistribution.
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20
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Glassman PM, Balthasar JP. Mechanistic considerations for the use of monoclonal antibodies for cancer therapy. Cancer Biol Med 2014; 11:20-33. [PMID: 24738036 PMCID: PMC3969805 DOI: 10.7497/j.issn.2095-3941.2014.01.002] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Accepted: 02/09/2014] [Indexed: 01/15/2023] Open
Abstract
Since the approval of rituximab in 1997, monoclonal antibodies (mAbs) have become an increasingly important component of therapeutic regimens in oncology. The success of mAbs as a therapeutic class is a result of great strides that have been made in molecular biology and in biotechnology over the past several decades. Currently, there are 14 approved mAb products for oncology indications, and there are ten additional mAbs in late stages of clinical trials. Compared to traditional chemotherapeutic agents, mAbs have several advantages, including a long circulating half-life and high target specificity. Antibodies can serve as cytotoxic agents when administered alone, exerting a pharmacologic effect through several mechanisms involving the antigen binding (Fab) and/or Fc domains of the molecule, and mAbs may also be utilized as drug carriers, targeting a toxic payload to cancer cells. The extremely high affinity of mAbs for their targets, which is desirable with respect to pharmacodynamics (i.e., contributing to the high therapeutic selectivity of mAb), often leads to complex, non-linear, target-mediated pharmacokinetics. In this report, we summarize the pharmacokinetic and pharmacodynamics of mAbs that have been approved and of mAbs that are near approval for oncology indications, with particular focus on the molecular and cellular mechanisms responsible for their disposition and efficacy.
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Affiliation(s)
- Patrick M Glassman
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, University at Buffalo, The State University of New York, Buffalo, NY 14214, USA
| | - Joseph P Balthasar
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, University at Buffalo, The State University of New York, Buffalo, NY 14214, USA
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21
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Hobor S, Van Emburgh BO, Crowley E, Misale S, Di Nicolantonio F, Bardelli A. TGFα and amphiregulin paracrine network promotes resistance to EGFR blockade in colorectal cancer cells. Clin Cancer Res 2014; 20:6429-38. [PMID: 24916700 DOI: 10.1158/1078-0432.ccr-14-0774] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Targeted inhibition of EGFR with the mAbs cetuximab or panitumumab is a valuable treatment for RAS wild-type colorectal cancers. The efficacy of EGFR blockade is limited by the emergence of acquired resistance often attributed to secondary KRAS mutations. Remarkably, tumor biopsies from resistant patients show that only a fraction of the resilient cells carry KRAS mutations. We hypothesized that a paracrine cross-talk driven by the resistant subpopulation may provide in trans protection of surrounding sensitive cells. EXPERIMENTAL DESIGN Conditioned medium assays and three-dimensional cocultures were used to assess paracrine networks between cetuximab-sensitive and -resistant cells. Production of EGFR ligands by cells sensitive to cetuximab and panitumumab was measured. The ability of recombinant EGFR ligands to protect sensitive cells from cetuximab was assessed. Biochemical activation of the EGFR signaling pathway was measured by Western blotting. RESULTS Colorectal cancer cells sensitive to EGFR blockade can successfully grow despite cetuximab treatment when in the company of their resistant derivatives. Media conditioned by resistant cells protect sensitive parental cells from cetuximab. EGFR blockade triggers increased secretion of TGFα and amphiregulin. Increased secretion of ligands by resistant cells can sustain EGFR/ERK signaling in sensitive cells. CONCLUSIONS Colorectal cancer cells that develop resistance to cetuximab and panitumumab secrete TGFα and amphiregulin, which protect the surrounding cells from EGFR blockade. This paracrine protective mechanism might be therapeutically exploitable.
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Affiliation(s)
| | | | - Emily Crowley
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo, Torino. FIRC Institute of Molecular Oncology (IFOM), Milano
| | - Sandra Misale
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo, Torino. University of Torino, Department of Oncology, Candiolo, Torino, Italy
| | - Federica Di Nicolantonio
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo, Torino. University of Torino, Department of Oncology, Candiolo, Torino, Italy
| | - Alberto Bardelli
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo, Torino. University of Torino, Department of Oncology, Candiolo, Torino, Italy.
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22
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EGFR ligands as pharmacodynamic biomarkers in metastatic colorectal cancer patients treated with cetuximab and irinotecan. Target Oncol 2013; 9:205-14. [PMID: 23821377 DOI: 10.1007/s11523-013-0284-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 06/21/2013] [Indexed: 02/07/2023]
Abstract
This study was conducted to describe the modulation of plasma epidermal growth factor receptor (EGFR) ligands in EGFR-positive metastatic colorectal cancer (mCRC) patients during treatment with cetuximab and irinotecan and to explore the clinical implication of plasma levels' variations as potential biomarkers of benefit. Plasma amphiregulin (AR), epidermal growth factor (EGF), transforming growth factor-α, and heparin binding-EGF were assessed by ELISA in 45 chemorefractory mCRC patients, treated with cetuximab and irinotecan. Plasma levels were measured before and 1 h after the first administration of cetuximab, before and 1 h after the second administration, and before the third and the fifth cycles. KRAS and BRAF mutational status were determined. EGFR ligands' levels were differently modulated according to tumor KRAS and BRAF mutational status. In KRAS wild-type patients (n = 34), AR and EGF early increased and higher increases were significantly associated with worse clinical outcome. By adopting a specific cut-off value, patients with higher levels of AR 1 h after the first administration had significantly worse response rate, progression free survival, and overall survival. This hypothesis-generating study shows that EGFR ligands are significantly modulated by cetuximab plus irinotecan according to KRAS and BRAF mutational status, and they warrant further investigation as pharmacodynamic markers of resistance to anti-EGFRs.
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