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Turjap M, Pelcová M, Gregorová J, Šmak P, Martin H, Štingl J, Peš O, Juřica J. Therapeutic Drug Monitoring of Pazopanib in Renal Cell Carcinoma and Soft Tissue Sarcoma: A Systematic Review. Ther Drug Monit 2024; 46:321-331. [PMID: 38723115 DOI: 10.1097/ftd.0000000000001206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 01/28/2024] [Indexed: 06/30/2024]
Abstract
BACKGROUND Pazopanib, an anti-angiogenic multitarget tyrosine kinase inhibitor, has been approved for the treatment of metastatic renal cell carcinoma and soft tissue sarcoma. However, its recommended dose does not always produce consistent outcomes, with some patients experiencing adverse effects or toxicity. This variability is due to differences in the systemic exposure to pazopanib. This review aimed to establish whether sufficient evidence exists for the routine or selective therapeutic drug monitoring of pazopanib in adult patients with approved indications. METHODS A systematic search of the PubMed and Web of Science databases using search terms related to pazopanib and therapeutic drug monitoring yielded 186 and 275 articles, respectively. Ten articles associated with treatment outcomes or toxicity due to drug exposure were selected for review. RESULTS The included studies were evaluated to determine the significance of the relationship between drug exposure/Ctrough and treatment outcomes and between drug exposure and toxicity. A relationship between exposure and treatment outcomes was observed in 5 studies, whereas the trend was nonsignificant in 4 studies. A relationship between exposure and toxicity was observed in 6 studies, whereas 2 studies did not find a significant relationship; significance was not reported in 3 studies. CONCLUSIONS Sufficient evidence supports the therapeutic drug monitoring of pazopanib in adult patients to improve its efficacy and/or safety in the approved indications.
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Affiliation(s)
- Miroslav Turjap
- Department of Clinical Pharmacy, University Hospital Ostrava, Ostrava, Czech Republic
| | - Marta Pelcová
- Department of Biochemistry, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Jana Gregorová
- Department of Biochemistry, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Pavel Šmak
- Department of Biochemistry, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Hiroko Martin
- Department of Pharmacology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Jan Štingl
- Department of Biochemistry, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Ondřej Peš
- Department of Biochemistry, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Jan Juřica
- Department of Pharmacology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
- Masaryk Memorial Cancer Institute, Brno, Czech Republic; and
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Masaryk University, Brno, Czech Republic
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Kato M, Maruyama S, Watanabe N, Yamada R, Suzaki Y, Ishida M, Kanno H. Preliminary Investigation of a Rapid and Feasible Therapeutic Drug Monitoring Method for the Real-Time Estimation of Blood Pazopanib Concentrations. AAPS J 2024; 26:48. [PMID: 38622446 DOI: 10.1208/s12248-024-00918-6] [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] [Received: 01/03/2024] [Accepted: 03/25/2024] [Indexed: 04/17/2024] Open
Abstract
Pazopanib is a multi-kinase inhibitor used to treat advanced/metastatic renal cell carcinoma and advanced soft tissue tumors; however, side effects such as diarrhea and hypertension have been reported, and dosage adjustment based on drug concentration in the blood is necessary. However, measuring pazopanib concentrations in blood using the existing methods is time-consuming; and current dosage adjustments are made using the results of blood samples taken at the patient's previous hospital visit (approximately a month prior). If the concentration of pazopanib could be measured during the waiting period for a doctor's examination at the hospital (in approximately 30 min), the dosage could be adjusted according to the patient's condition on that day. Therefore, we aimed to develop a method for rapidly measuring blood pazopanib concentrations (in approximately 25 min) using common analytical devices (a tabletop centrifuge and a spectrometer). This method allowed for pazopanib quantification in the therapeutic concentration range (25-50 μg/mL). Additionally, eight popular concomitant medications taken simultaneously with pazopanib did not interfere with the measurements. We used the developed method to measure blood concentration in two patients and obtained similar results to those measured using the previously reported HPLC method. By integrating it with the point of care and sample collection by finger pick, this method can be used for measurements in pharmacies and patients' homes. This method can maximize the therapeutic effects of pazopanib by dose adjustment to control adverse events.
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Affiliation(s)
- Masaru Kato
- Department of Bioanalytical Chemistry, Showa University Graduate School of Pharmacy, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, 142-8555, Japan.
| | - Shinichi Maruyama
- Department of Bioanalytical Chemistry, Showa University Graduate School of Pharmacy, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, 142-8555, Japan
- Department of Pharmacy, Saiseikai Yokohamashi Tobu Hospital, 3-6-1 Shimosueyoshi Tsurumi-ku, Yokohama, Kanagawa, 230-8765, Japan
| | - Noriko Watanabe
- Department of Bioanalytical Chemistry, Showa University Graduate School of Pharmacy, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, 142-8555, Japan
| | - Risa Yamada
- Department of Bioanalytical Chemistry, School of Pharmacy, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, 142-8555, Japan
| | - Yuki Suzaki
- Department of Bioanalytical Chemistry, School of Pharmacy, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, 142-8555, Japan
| | - Masaru Ishida
- Department of Urology, Saiseikai Yokohamashi Tobu Hospital, 3-6-1 Shimosueyoshi Tsurumi-ku, Yokohama, Kanagawa, 230-8765, Japan
| | - Hiroshi Kanno
- Department of Pharmacy, Saiseikai Yokohamashi Tobu Hospital, 3-6-1 Shimosueyoshi Tsurumi-ku, Yokohama, Kanagawa, 230-8765, Japan
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Stott EK, Nie S, Williamson NA, Skerratt LF. Free drug percentage of moxidectin declines with increasing concentrations in the serum of marsupials. Int J Parasitol Parasites Wildl 2024; 23:100899. [PMID: 38274349 PMCID: PMC10808906 DOI: 10.1016/j.ijppaw.2023.100899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Revised: 12/19/2023] [Accepted: 12/20/2023] [Indexed: 01/27/2024]
Abstract
Moxidectin (MOX) is a macrocyclic lactone used to eliminate endo and ectoparasites in many mammalian species. It is notably the active ingredient of the anti-parasitic drug Cydectin®, manufactured by Virbac, and is frequently used to treat sarcoptic mange in Australian wildlife. Protein binding plays a significant role in the efficacy of a drug, as the unbound/free drug in plasma ultimately reflects the pharmacologically relevant concentration. This study aimed to investigate the free drug percentage of Moxidectin after in vitro spiking into the sera of four sarcoptic mange-susceptible Australian wildlife species; the koala (Phascolarctos cinereus), the bare-nosed wombat (Vombatus ursinus), the eastern grey kangaroo (Macropus giganteus), and the mountain brushtail possum (Trichosurus cunninghami). Three concentration points of MOX were tested for each individual: 20 pg/μL, 100 pg/μL and 500 pg/μL. Serum from five individuals of each species underwent an equilibrium dialysis followed by liquid chromatography tandem mass spectrometry (LC-MS/MS). The results showed an atypical concentration dependent binding across all species, where free drug percentage decreased as MOX concentration increased. In addition, wombats showed significantly lower free drug levels. These findings call for further research into the mechanisms of moxidectin protein binding to help understand MOX pharmacokinetics in marsupials.
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Affiliation(s)
- Eliza K. Stott
- One Health Research Group, Melbourne Veterinary School, Faculty of Science, Werribee, The University of Melbourne, Victoria, Australia
| | - Shuai Nie
- Melbourne Mass Spectrometry and Proteomics Facility, The University of Melbourne, Victoria, Australia
| | - Nicholas A. Williamson
- Melbourne Mass Spectrometry and Proteomics Facility, The University of Melbourne, Victoria, Australia
| | - Lee F. Skerratt
- One Health Research Group, Melbourne Veterinary School, Faculty of Science, Werribee, The University of Melbourne, Victoria, Australia
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4
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Saiki T, Ogata G, Sawamura S, Asai K, Razvina O, Watanabe K, Kato R, Zhang Q, Akiyama K, Madhurantakam S, Ahmad NB, Ino D, Nashimoto H, Matsumoto Y, Moriyama M, Horii A, Kondo C, Ochiai R, Kusuhara H, Saijo Y, Einaga Y, Hibino H. A strategy for low-cost portable monitoring of plasma drug concentrations using a sustainable boron-doped-diamond chip. Heliyon 2023; 9:e15963. [PMID: 37234605 PMCID: PMC10205593 DOI: 10.1016/j.heliyon.2023.e15963] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 04/20/2023] [Accepted: 04/27/2023] [Indexed: 05/28/2023] Open
Abstract
On-site monitoring of plasma drug concentrations is required for effective therapies. Recently developed handy biosensors are not yet popular owing to insufficient evaluation of accuracy on clinical samples and the necessity of complicated costly fabrication processes. Here, we approached these bottlenecks via a strategy involving engineeringly unmodified boron-doped diamond (BDD), a sustainable electrochemical material. A sensing system based on a ∼1 cm2 BDD chip, when analysing rat plasma spiked with a molecular-targeting anticancer drug, pazopanib, detected clinically relevant concentrations. The response was stable in 60 sequential measurements on the same chip. In a clinical study, data obtained with a BDD chip were consistent with liquid chromatography-mass spectrometry results. Finally, the portable system with a palm-sized sensor containing the chip analysed ∼40 μL of whole blood from dosed rats within ∼10 min. This approach with the 'reusable' sensor may improve point-of-monitoring systems and personalised medicine while reducing medical costs.
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Affiliation(s)
- Takuro Saiki
- Department of Medical Oncology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori Chuo-ku, Niigata, Niigata 951-8510, Japan
| | - Genki Ogata
- Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Yokohama, Kanagawa 223-8522, Japan
| | - Seishiro Sawamura
- Division of Glocal Pharmacology, Department of Pharmacology, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kai Asai
- Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Yokohama, Kanagawa 223-8522, Japan
| | - Olga Razvina
- G-MedEx Project, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori Chuo-ku, Niigata, Niigata 951-8510, Japan
| | - Kota Watanabe
- Niigata University School of Medicine, 1-757 Asahimachi-dori Chuo-ku, Niigata, Niigata 951-8510, Japan
| | - Rito Kato
- Niigata University School of Medicine, 1-757 Asahimachi-dori Chuo-ku, Niigata, Niigata 951-8510, Japan
| | - Qi Zhang
- Division of Glocal Pharmacology, Department of Pharmacology, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
- Department of Otolaryngology Head and Neck Surgery, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori Chuo-ku, Niigata, Niigata 951-8510, Japan
| | - Koei Akiyama
- Division of Glocal Pharmacology, Department of Pharmacology, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
- Department of Molecular Physiology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori Chuo-ku, Niigata, Niigata 951-8510, Japan
| | - Sasya Madhurantakam
- Division of Glocal Pharmacology, Department of Pharmacology, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Norzahirah Binti Ahmad
- Division of Glocal Pharmacology, Department of Pharmacology, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Daisuke Ino
- Division of Glocal Pharmacology, Department of Pharmacology, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Haruma Nashimoto
- Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1, Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Yoshifumi Matsumoto
- Department of Medical Oncology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori Chuo-ku, Niigata, Niigata 951-8510, Japan
| | - Masato Moriyama
- Department of Medical Oncology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori Chuo-ku, Niigata, Niigata 951-8510, Japan
| | - Arata Horii
- Department of Otolaryngology Head and Neck Surgery, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori Chuo-ku, Niigata, Niigata 951-8510, Japan
| | - Chie Kondo
- Pharmaceuticals and Life Sciences Division, Shimadzu Techno-Research, Inc., 1, Nishinokyo-shimoai-cho, Nakagyo-ku, Kyoto, Kyoto 604-8436, Japan
| | - Ryosuke Ochiai
- Pharmaceuticals and Life Sciences Division, Shimadzu Techno-Research, Inc., 1, Nishinokyo-shimoai-cho, Nakagyo-ku, Kyoto, Kyoto 604-8436, Japan
| | - Hiroyuki Kusuhara
- Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1, Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Yasuo Saijo
- Department of Medical Oncology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori Chuo-ku, Niigata, Niigata 951-8510, Japan
| | - Yasuaki Einaga
- Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Yokohama, Kanagawa 223-8522, Japan
| | - Hiroshi Hibino
- Division of Glocal Pharmacology, Department of Pharmacology, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
- AMED-CREST, AMED, Osaka 565-0871, Japan
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Zhao Y, Grigoryan G. Multiplex measurement of protein-peptide dissociation constants using dialysis and mass spectrometry. Protein Sci 2023; 32:e4607. [PMID: 36823715 PMCID: PMC10031237 DOI: 10.1002/pro.4607] [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: 08/14/2022] [Revised: 02/19/2023] [Accepted: 02/22/2023] [Indexed: 02/25/2023]
Abstract
We propose a high-throughput method for quantitively measuring hundreds of protein-peptide binding affinities in parallel. In this assay a solution of protein is dialyzed into a buffer containing a pool of potential binding peptides, such that upon equilibration the relative abundance of a peptide species is mathematically related to that peptide's dissociation constant, Kd . We use isobaric multiplexed quantitative proteomics to simultaneously determine the relative abundance, and hence the Kd and its associated error, for an entire peptide library. We apply this technique, which we call PEDAL (Parallel Equilibrium Dialysis for Affinity Learning), to determine accurate Kd 's between a PDZ domain and hundreds of peptides, spanning an affinity range of multiple orders of magnitude in a single experiment. PEDAL is a convenient, fast, and low-cost method for measuring large numbers of protein-peptide affinities in parallel, providing a rare combination of true in-solution binding equilibria with the ability to multiplex. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Yu Zhao
- Department of Computer Science, Dartmouth College, Hanover, New Hampshire
| | - Gevorg Grigoryan
- Department of Computer Science, Dartmouth College, Hanover, New Hampshire
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Therapeutic Monitoring of Orally Administered, Small-Molecule Anticancer Medications with Tumor-Specific Cellular Protein Targets in Peripheral Fluid Spaces-A Review. Pharmaceutics 2023; 15:pharmaceutics15010239. [PMID: 36678867 PMCID: PMC9864625 DOI: 10.3390/pharmaceutics15010239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/29/2022] [Accepted: 12/30/2022] [Indexed: 01/13/2023] Open
Abstract
Orally administered, small-molecule anticancer drugs with tumor-specific cellular protein targets (OACD) have revolutionized oncological pharmacotherapy. Nevertheless, the differences in exposure to these drugs in the systemic circulation and extravascular fluid compartments have led to several cases of therapeutic failure, in addition to posing unknown risks of toxicity. The therapeutic drug monitoring (TDM) of OACDs in therapeutically relevant peripheral fluid compartments is therefore essential. In this work, the available knowledge regarding exposure to OACD concentrations in these fluid spaces is summarized. A review of the literature was conducted by searching Embase, PubMed, and Web of Science for clinical research articles and case reports published between 10 May 2001 and 31 August 2022. Results show that, to date, penetration into cerebrospinal fluid has been studied especially intensively, in addition to breast milk, leukocytes, peripheral blood mononuclear cells, peritoneal fluid, pleural fluid, saliva and semen. The typical clinical indications of peripheral fluid TDM of OACDs were (1) primary malignancy, (2) secondary malignancy, (3) mental disorder, and (4) the assessment of toxicity. Liquid chromatography-tandem mass spectrometry was most commonly applied for analysis. The TDM of OACDs in therapeutically relevant peripheral fluid spaces is often indispensable for efficient and safe treatments.
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Cai J, Huang J, Yan Z. High-throughput protein binding assay using cross-sample pooling in combination with high-resolution mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2022; 36:e9400. [PMID: 36111382 DOI: 10.1002/rcm.9400] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 08/04/2022] [Accepted: 09/12/2022] [Indexed: 06/15/2023]
Abstract
RATIONALE The fraction of unbound drugs (ƒu ) is a useful pharmacokinetic parameter in understanding drug disposition (Absorption, Distribution, Metabolism, Excretion), pharmacological activity and toxicity. Therefore, protein binding assays are frequently performed in drug development, creating a high demand for biological, experimental and analytical resources. Our work aims to increase binding assay throughput and comprehensiveness, while reducing biological and experimental consumption without compromising data quality by introducing cross-pooling and cassetting procedures, followed by a rapid and informative high-resolution mass spectrometry (HRMS) analysis. METHODS Individual drugs were spiked into a test matrix and incubated in a rapid equilibrium dialysis device. After incubation, a cross-pooling procedure was performed, in which the samples of one drug were equalized with the complementary matrix provided from a different drug. The same drugs were also assayed with a conventional method, in which samples were equalized with the newly prepared complementary matrix. Cross-pooled samples were further cassetted to increase throughput. The samples were analyzed by high-performance liquid chromatography coupled with an Orbitrap HRMS, and the fu values were calculated and compared between the cross-pooling and conventional sampling procedures. RESULTS Highly comparable human plasma fu values of 27 drugs representing different chemical classes and wide-ranging fu values were obtained by conventional and cross-pooling procedures, The tight correlation was further validated in other species (rat, mouse) and matrices (microsomes, brain). In addition, the cassetted samples showed highly consistent fu values compared to their noncassetted counterparts. Moreover, HRMS analysis not only showed highly consistent and repeatable quantification results compared to the "gold standard" triple quadrupole (QqQ) analysis, but also demonstrated outstanding advantage over QqQ in enabling a high-throughput, informative and versatile analysis. CONCLUSIONS This work demonstrates that the cross-pooling procedure with further sample cassetting using HRMS is experimentally and analytically feasible to allow a higher throughput (increased by up to 8-fold), resource-effective (reducing matrix consumption by 50%, minimizing time spent on method development and platemap design), analytically dependable (accurate quantification), and versatile (metabolite elucidation and low recovery troubleshooting) analysis.
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Affiliation(s)
- Jingwei Cai
- Department of Drug Metabolism and Pharmacokinetics, Genentech, Inc, South San Francisco, CA, USA
| | - Julie Huang
- Department of Drug Metabolism and Pharmacokinetics, Genentech, Inc, South San Francisco, CA, USA
| | - Zhengyin Yan
- Department of Drug Metabolism and Pharmacokinetics, Genentech, Inc, South San Francisco, CA, USA
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Wang L, Zhang W, Shao Y, Zhang D, Guo G, Wang X. Analytical methods for obtaining binding parameters of drug–protein interactions: A review. Anal Chim Acta 2022; 1219:340012. [DOI: 10.1016/j.aca.2022.340012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 05/25/2022] [Accepted: 05/27/2022] [Indexed: 11/30/2022]
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Matsumoto A, Shiraiwa K, Suzuki Y, Tanaka K, Kawano M, Iwasaki T, Tanaka R, Tatsuta R, Tsumura H, Itoh H. Sensitive quantification of free pazopanib using ultra-high performance liquid chromatography coupled to tandem mass spectrometry and assessment of clinical application. J Pharm Biomed Anal 2021; 206:114348. [PMID: 34509660 DOI: 10.1016/j.jpba.2021.114348] [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: 05/24/2021] [Revised: 08/25/2021] [Accepted: 08/27/2021] [Indexed: 10/20/2022]
Abstract
Pazopanib is widely used to treat renal cell carcinomas and soft tissue tumors in Japan. Although several reports demonstrated the usefulness of therapeutic drug monitoring (TDM) of pazopanib, those studies measured only total pazopanib concentration. For drugs with high protein binding rates such as pazopanib, measuring free concentrations may be clinically more useful than measuring total concentrations. In this study, we aimed to develop a high-throughput method for quantification of free pazopanib in human plasma using ultra-high performance liquid chromatography coupled to tandem mass spectrometry (UHPLC-MS/MS). Free pazopanib was separated by ultrafiltration. After a simple solid-phase extraction step using a 96-well plate, pazopanib was analyzed by UHPLC-MS/MS in positive electrospray ionization mode. The novel method fulfilled the requirements of the US Food and Drug Administration guidelines for assay validation, and the lower limit of quantification was 0.05 ng/mL. The calibration curve was linear over the concentration range of 0.05-50 ng/mL. The average recovery rate was 66.9 ± 2.1% (mean ± SD). The precision was below 7.02%, and accuracy was within 10.60% across all quality control levels. Matrix effect varied between 44.4% and 60.4%. This assay was successfully applied to measure trough free pazopanib concentrations in three patients treated with pazopanib for soft tissue tumors. We succeeded to develop a novel high-throughput UHPLC-MS/MS method for quantification of free pazopanib in human plasma. This method can be applied to TDM for patients receiving pazopanib in the clinical setting.
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Affiliation(s)
- Asami Matsumoto
- Department of Clinical Pharmacy, Oita University Hospital, Yufu-shi, Oita, Japan
| | - Ken Shiraiwa
- Department of Clinical Pharmacy, Oita University Hospital, Yufu-shi, Oita, Japan.
| | - Yosuke Suzuki
- Department of Clinical Pharmacy, Oita University Hospital, Yufu-shi, Oita, Japan
| | - Kazuhiro Tanaka
- Department of Orthopaedic Surgery, Oita University Faculty of Medicine, Yufu-shi, Oita, Japan
| | - Masanori Kawano
- Department of Orthopaedic Surgery, Oita University Faculty of Medicine, Yufu-shi, Oita, Japan
| | - Tatsuya Iwasaki
- Department of Orthopaedic Surgery, Oita University Faculty of Medicine, Yufu-shi, Oita, Japan
| | - Ryota Tanaka
- Department of Clinical Pharmacy, Oita University Hospital, Yufu-shi, Oita, Japan
| | - Ryosuke Tatsuta
- Department of Clinical Pharmacy, Oita University Hospital, Yufu-shi, Oita, Japan
| | - Hiroshi Tsumura
- Department of Orthopaedic Surgery, Oita University Faculty of Medicine, Yufu-shi, Oita, Japan
| | - Hiroki Itoh
- Department of Clinical Pharmacy, Oita University Hospital, Yufu-shi, Oita, Japan
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