AAPS JournalPub Date : 2025-01-22DOI: 10.1208/s12248-025-01019-8
Sana Gupta, Vivek Purohit, Yuchen Wang, John P Prybylski
{"title":"Operating Characteristics of the Simulated Healthy Participant Approach in Impaired Clearance Studies.","authors":"Sana Gupta, Vivek Purohit, Yuchen Wang, John P Prybylski","doi":"10.1208/s12248-025-01019-8","DOIUrl":"10.1208/s12248-025-01019-8","url":null,"abstract":"<p><p>Minimizing harm is a cornerstone of ethical research practices. A drug that has undergone extensive clinical pharmacological testing in healthy participants (HPs) and a diverse selection of patients can be described with a sufficiently predictive population pharmacokinetic (PopPK) model. In impaired clearance trials, recruitment is minimized and underpowered for all but major exposure differences. Virtual HP arms have been reported to support similar conclusions to conventional impaired clearance studies, and further minimize potential harm of drug exposure without medical benefit by eliminating an arm of the study. However, the extent to which the conventional analysis of impairment studies compare to the simulation approach is unknown. Here we assess the operating characteristics of the virtual cohort approach along with the conventional approach through controlled simulations. These simulations included a simple, widely accessible PopPK model and several internal models that have been used in a previous meta-analysis of the virtual cohort approach. In the pairwise comparisons assessed, the virtual cohort simulation approach had greater power per sample size than the conventional approach and the same power under the null hypothesis. Given key methodological differences, it is recommended that the simulation and conventional approaches be treated as having approximately the same power under equivalent conditions. These results provide a strong justification for the use of the virtual cohort approach when an adequate PopPK model is available, minimizing unnecessary exposure to study drugs that will not benefit healthy study participants.</p>","PeriodicalId":50934,"journal":{"name":"AAPS Journal","volume":"27 1","pages":"32"},"PeriodicalIF":5.0,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143025694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AAPS JournalPub Date : 2025-01-22DOI: 10.1208/s12248-025-01016-x
Laura G Al-Amiry Santos, Helen Musther, Neeru Bala, Neel Deferm, Gaurangkumar Patel, Joachim Brouwers, David B Turner
{"title":"Gastrointestinal Bile Salt Concentrations in Healthy Adults Under Fasted and Fed Conditions: A Systematic Review and Meta-Analysis for Mechanistic Physiologically-Based Pharmacokinetic (PBPK) Modelling.","authors":"Laura G Al-Amiry Santos, Helen Musther, Neeru Bala, Neel Deferm, Gaurangkumar Patel, Joachim Brouwers, David B Turner","doi":"10.1208/s12248-025-01016-x","DOIUrl":"10.1208/s12248-025-01016-x","url":null,"abstract":"<p><p>Bile salts are biosurfactants released into the intestinal lumen which play an important role in the solubilisation of fats and certain drugs. Their concentrations vary along the gastrointestinal tract (GIT). This is significant for implementation in physiologically based pharmacokinetic (PBPK) modelling to mechanistically capture drug absorption. The aims of this meta-analysis were to collate all appropriate data on intestinal bile salt concentrations in healthy adults across all GIT segments in fasted and fed states for the purpose of PBPK modelling. Terms relating to bile composition were searched in PubMed and Google Scholar from inception to May 2024. Selected studies included aspirated intestinal fluid collected via gastric tubes or colonoscopy. Results showed high variability across studies and a time-dependency for the fed state. Data were rich for the duodenum, which showed a two-fold increase for the fed state versus the fasted state within multiple studies. Peaks and troughs in bile salt concentrations along the GIT were observed for both fasted and fed states, likely due to segmental water absorption differences. The highest between subject variability was observed for the duodenum in the fasted and fed state and the fed proximal jejunum, distal ileum, and colon. The findings from this meta-analysis can be used for the purpose of PBPK modelling to capture segmental drug solubilisation and absorption in fasted and fed states. However, data are lacking under different fed conditions, especially following low-fat meals, so the impact of different fat content associated with different meals on bile salt concentrations cannot be discerned.</p>","PeriodicalId":50934,"journal":{"name":"AAPS Journal","volume":"27 1","pages":"31"},"PeriodicalIF":5.0,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143025648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AAPS JournalPub Date : 2025-01-17DOI: 10.1208/s12248-025-01015-y
Bernardo Filipe Santos Gomes, Laure-Anne Bya, Nathan Koch, Helena Cabral-Marques, Brigitte Evrard, Anna Lechanteur
{"title":"Cannabidiol and Hydroxypropyl-β-Cyclodextrin for the Development of Deflated Spherical-Shaped Inhalable Powder.","authors":"Bernardo Filipe Santos Gomes, Laure-Anne Bya, Nathan Koch, Helena Cabral-Marques, Brigitte Evrard, Anna Lechanteur","doi":"10.1208/s12248-025-01015-y","DOIUrl":"10.1208/s12248-025-01015-y","url":null,"abstract":"<p><p>In addition to the known therapeutic indications for cannabidiol, its administration by inhalation appears to be of great interest. Indeed, there is evidence of cannabidiol's efficacy in several physiological pathways, suggesting its potential for a wide range of applications for both local and systemic pulmonary administration like cancers. Significant advances in pulmonary drug delivery have led to innovative strategies to address the challenges of increasing the respirable fraction of drugs and standardizing inhalable products. Among different devices, dry powder inhalers offer significant advantages including high stability and ease of use. Particle engineering using techniques such as spray drying is now the focus of research and is expected to improve upon, rather than completely replace, traditional carrier-based formulations. The development of carrier-free powders (without lactose-carrier) is mainly used for medicines with low active ingredient doses, which limits the technology. Previously, we demonstrated the benefits of using a cyclodextrin to obtain deflated spherical-shaped powders by spray drying. In this study the potential of this excipient with a very poorly water-soluble active molecule was investigated. Inhalable cannabidiol powders were developed by spray drying, using the solubility enhancers hydroxypropyl-beta-cyclodextrin and ethanol to optimize cannabidiol water-solubility. Electron microscopy images revealed consistent deflated spherical shapes, while particle size analysis showed low polydispersity and suitable sizes for deep lung deposition (2 µm). The selected engineered powders (without ethanol) had very high fine particle fractions (> 60%) due to their deflated surface. Finally, the powder was instantly solubilized leading to drug dissolution, which is important for therapeutic efficacy. In conclusion, this study successfully develops a cannabidiol inhalation powder by particle engineering having suitable aerosolization behavior. Due to the speed of the process and the performance of the finished product, this work opens the door for future studies. It has been shown that active molecules that are only slightly soluble in water can be formulated effectively as a powder for inhalation. Other molecules could be tested and subsequent in vivo studies conducted to demonstrate correlation with these in vitro results.</p>","PeriodicalId":50934,"journal":{"name":"AAPS Journal","volume":"27 1","pages":"30"},"PeriodicalIF":5.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143015445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AAPS JournalPub Date : 2025-01-17DOI: 10.1208/s12248-024-01009-2
Han Gao, Chao-Yang Du, Aiping Zheng, Ci Qian, Wei-Jie Fang
{"title":"Formulation Factors Affecting the Formation of Visible-Bubbles During the Reconstitution Process of Freeze-Dried Etanercept Formulations: Protein Concentration, Stabilizers, and Surfactants.","authors":"Han Gao, Chao-Yang Du, Aiping Zheng, Ci Qian, Wei-Jie Fang","doi":"10.1208/s12248-024-01009-2","DOIUrl":"10.1208/s12248-024-01009-2","url":null,"abstract":"<p><p>Freeze drying is one of the common methods to extend the long-term stability of biologicals. Biological products in solid form have the advantages of convenient transportation and stable long-term storage. However, long reconstitution time and extensive visible bubbles are frequently generated during the reconstitution process for many freeze-dried protein formulations, which can potentially affect the management efficiency of staff, patient compliance, and product quality. The reconstitution time has been extensively studied, but the influence of the formulations on the formation of visible bubbles is often overlooked. This paper investigated the effect of freeze-drying formulation factors (i.e., protein concentrations, surfactant concentrations, and sucrose/mannitol compositions) on product stability and visible bubbles generated during reconstitution of freeze-dried etanercept formulations. The generating and breakup mechanisms of visible bubbles were detected via internal microstructure of cake, surface tension, and viscosity measurement. Under the same protein concentration, the formulation of mannitol mixed with sucrose in a weight ratio of 4:1 produces fewer visible bubbles during the reconstitution process compared to the formulation of sucrose with the same total mass. This has been proven to be due to the large number of smaller radius pores distributed in the pores of the freeze-dried cake of the former, while the average internal structure pores of the latter are much larger than those of the former. As an amorphous stabilizer, sucrose can ensure the long-term stability of protein and greatly reduce the generation and maintenance of foams in the reconstitution process, making it a more robust excipient for freeze-dried protein formulations.</p>","PeriodicalId":50934,"journal":{"name":"AAPS Journal","volume":"27 1","pages":"29"},"PeriodicalIF":5.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143015499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AAPS JournalPub Date : 2025-01-16DOI: 10.1208/s12248-024-01002-9
Jessica Ortiz, Laura Brunner, Lei Ci, Rena Baek, Darshana Jani, Jean-Claude Marshall, Jason Pennucci
{"title":"Comparison of RT-qPCR With Branched DNA to Quantify a Lipid Nanoparticle-Encapsulated mRNA Therapeutic in Serum and Liver Tissue Samples From Nonclinical PK Studies.","authors":"Jessica Ortiz, Laura Brunner, Lei Ci, Rena Baek, Darshana Jani, Jean-Claude Marshall, Jason Pennucci","doi":"10.1208/s12248-024-01002-9","DOIUrl":"10.1208/s12248-024-01002-9","url":null,"abstract":"<p><p>While the branched DNA (bDNA) assay is an established bioanalytical method for measurement of lipid nanoparticle (LNP)-encapsulated messenger RNA (mRNA) pharmacokinetic parameters, reverse transcription-quantitative polymerase chain reaction (RT-qPCR) has been considered as an alternative platform. RT-qPCR and bDNA platforms were compared for sensitivity, specificity, correlation, and overall assay performance using serum and tissue samples from 2 nonclinical mouse studies of a therapeutic mRNA candidate, LNP-PAH-mRNA, which encodes for human phenylalanine hydroxylase enzyme. Pharmacokinetic parameter noncompartmental analysis was completed using Phoenix WinNonlin. The assays were compared using simple linear regression and Bland-Altman analyses. Sensitivity ranged from 0.05 to 6.40 ng/mL for the bDNA assays, from 0.00000761 to 7.61 ng/mL in serum, and from 0.000179 to 179 ng/g in tissue for the RT-qPCR assay. Inter-assay accuracy was within ± 10%, inter-assay precision was ≤ 10%, and the total error for both assays was ≤ 20%. RT-qPCR serum mRNA concentrations were 2- to fourfold lower compared with the bDNA assay, whereas tissue samples were comparable between assays. A linear relationship with - 0.37 to - 0.02 systematic bias demonstrated acceptable concordance. Bland-Altman plots demonstrated close equivalence, with a negative bias of < 0.5, and ≥ 95% of the data points were within the 95% limits of agreement. The comparison of the RT-qPCR with bDNA assay platforms for quantification of pharmacokinetic properties of an mRNA-LNP therapeutic has demonstrated acceptable concordance. This comparison reinforces the use of the RT-qPCR, a widely accessible strategy, as an alternative platform for the quantification of subsequent mRNA-LNP therapeutics.</p>","PeriodicalId":50934,"journal":{"name":"AAPS Journal","volume":"27 1","pages":"27"},"PeriodicalIF":5.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AAPS JournalPub Date : 2025-01-13DOI: 10.1208/s12248-024-01013-6
Mario Nagase, Brett Houk, Irene Vuu, Panli Cardona, Sandeep Dutta, Chih-Wei Lin
{"title":"Population Pharmacokinetics of Sotorasib in Healthy Subjects and Advanced Solid Tumor Patients Harboring a KRAS<sup>G12C</sup> Mutation from Phase 1 and Phase 2 Studies.","authors":"Mario Nagase, Brett Houk, Irene Vuu, Panli Cardona, Sandeep Dutta, Chih-Wei Lin","doi":"10.1208/s12248-024-01013-6","DOIUrl":"10.1208/s12248-024-01013-6","url":null,"abstract":"<p><p>Sotorasib is a novel KRAS<sup>G12C</sup> inhibitor that has shown robust efficacy, safety, and tolerability in patients with KRAS<sup>G12C</sup> mutation. The objectives of the population pharmacokinetic (PK) analysis were to characterize sotorasib population PK in healthy subjects and patients with advanced solid tumors with KRAS<sup>G12C</sup> mutation from 6 clinical studies, evaluate the effects of intrinsic and extrinsic factors on PK parameters, and perform simulations to further assess the impact of identified covariates on sotorasib exposures. A two-compartment disposition model with three transit compartments for absorption and time-dependent clearance and bioavailability well described sotorasib PK. Sotorasib exposure increased in a less-than-dose proportional manner across the evaluated 180 mg to 960 mg dose range. Disease burden, measured by Eastern Cooperative Oncology Group (ECOG) score and baseline tumor size, were identified as significant covariates on clearance. Lower disease burden was associated with higher clearance (and thus lower sotorasib exposure). Low albumin was found to be associated with lower clearance of sotorasib. Use of PPIs was associated with reduced sotorasib exposures. Although sex, race, and high fat meal were significantly associated with PK parameters, their impact on exposures were not clinically relevant. Other evaluated covariates, including body weight, age, renal impairment (evaluated by chronic kidney disease stage score) and hepatic impairment (evaluated by NCI criteria) were not statistically significant. Greater baseline disease burden and low albumin were associated with lower sotorasib clearance; based on the established efficacy and safety profiles from clinical trials, the estimated magnitude of these effects does not warrant a dose adjustment.</p>","PeriodicalId":50934,"journal":{"name":"AAPS Journal","volume":"27 1","pages":"26"},"PeriodicalIF":5.0,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AAPS JournalPub Date : 2025-01-09DOI: 10.1208/s12248-024-01011-8
Ruihong Yu, William J Jusko
{"title":"Meta-Analysis of the Input and Disposition of Various Dosage Forms of Methylprednisolone in Healthy Subjects Utilizing a Physiologically Based Pharmacokinetic Model.","authors":"Ruihong Yu, William J Jusko","doi":"10.1208/s12248-024-01011-8","DOIUrl":"10.1208/s12248-024-01011-8","url":null,"abstract":"<p><p>The study quantitatively analyzes and compares the pharmacokinetics (PK) of methylprednisolone (MPL) in humans upon administration of various dosage forms. The PK parameters and profiles of MPL in healthy subjects were collected from 22 literature sources. A minimal physiologically based pharmacokinetic (mPBPK) model consisting of blood and two tissue (lumped liver and kidney, remainder) compartments with nonlinear tissue partitioning was applied to describe MPL disposition. Overall 18 plasma concentration profiles were well captured and 85% of PK parameters reasonably estimated. The clearance (CL) of MPL averaged 336 mL/h/kg and appeared slightly nonlinear across a dosage range of 5 to 800 mg, the distribution volume (V<sub>d</sub>) averaged 1.17 L/kg, and the model predicted elimination half-life (t<sub>1/2</sub>) was 2.6 h. Rapid prodrug conversion was found for intravenous MPL sodium succinate (MPSS) with a t<sub>1/2</sub> of 1.7 min, and followed by MPL phosphate (MPPS) 3.8 min, MPL hemisuccinate (MPHS) 16 min, and MPL suleptanate (MPSP) 2.9 h. Their bioavailabilities (F) varied slightly from 60 to 73%. Intramuscular doses showed an absorption rate constant (k<sub>a</sub>) of 1.5 h<sup>-1</sup> for MPSS and 96 h<sup>-1</sup> for MPSP. Oral doses of 5 formulations were examined. Medrol exhibited greatest absorption with F of 74% and k<sub>a</sub> of 2.1 h<sup>-1</sup>, while one generic product had F of 32.6%. This study demonstrated the utility of a mechanistic mPBPK disposition model for comparing MPL formation from various esters, absorption from several oral dose formulations, and modest variability across numerous PK studies in healthy humans.</p>","PeriodicalId":50934,"journal":{"name":"AAPS Journal","volume":"27 1","pages":"24"},"PeriodicalIF":5.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11892033/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142958403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AAPS JournalPub Date : 2025-01-09DOI: 10.1208/s12248-024-01012-7
Annagiulia Di Trana, Nunzia La Maida, Georgina de la Rosa, Alessandro Di Giorgi, Silvia Graziano, Khaled Aldhaehri, Esther Papaseit, Olga Hladun, Magí Farré, Clara Pérez, Simona Pichini
{"title":"Early and Mid-Term Disposition of α-PVP and its unknown Metabolites in Urine and Oral Fluid Through a Multi-Analytical Hyphenated Approach Following a Single Non-Controlled Administration to Healthy Volunteers.","authors":"Annagiulia Di Trana, Nunzia La Maida, Georgina de la Rosa, Alessandro Di Giorgi, Silvia Graziano, Khaled Aldhaehri, Esther Papaseit, Olga Hladun, Magí Farré, Clara Pérez, Simona Pichini","doi":"10.1208/s12248-024-01012-7","DOIUrl":"10.1208/s12248-024-01012-7","url":null,"abstract":"<p><p>Nowadays, synthetic cathinones (SCs) is the second more representative subclass of New Psychoactive Substances, accounting for 104 analogues in the illegal market. Since its first report in 2011, α-pyrrolidinovalerophenone (α-PVP) gained popularity among drug users, provoking an increased number of intoxications. Nonetheless, pharmacokinetics data is still limited in the literature. An observational non-controlled naturalistic study on 8 healthy volunteers was conducted to assess the α-PVP and β-OH-α-PVP concentrations in OF and urine, after snorting 10 mg or 20 mg of α-PVP. A multi-analytical approach based on GC-EI-MS/MS and LC-HESI-HRMS/MS was developed and fully validated for the analytes quantification, while four untargeted LC-HESI-HRMS/MS methods in full-MS and ddMS<sup>2</sup> were set up for unknown metabolites characterization in urine samples assisted by a dedicated data mining software. In OF, α-PVP reached a mean C<sub>max</sub> of 762 ± 323 ng/mL at 1 h after 10 mg administration, while a C<sub>max</sub> of 2,900 ± 1,373 ng/mL at 47 min after 20 mg dose. In urine, a total α-PVP mean amount of 179.2 ± 94.9 µg was accumulated after 10 mg dose, (27.2 ± 9.8 µg between 0-2 h and 152.0 ± 98.2 µg between 2-5 h), while a total amount of 122.9 ± 44.0 µg, of (36.2 ± 16.5 and 86.7 ± 28.3 µg between 0-2 and 2-5 h, respectively) was detected after 20 mg dose. Among the 10 identified metabolites, β-OH-α-PVP was a minor metabolite (total amount: 56.4 ± 27.1 and 69.1 ± 38.1 µg after 10 mg and 20 mg). The N-butanoic acid metabolite was the most abundant, detected also as glucuronide. In conclusion, α-PVP showed a later time peak than non-pyrrolidine SCs, with comparable C<sub>max.</sub> The pyrrolidine ring oxidative opening produced the most abundant urinary metabolite, independently from the dose.</p>","PeriodicalId":50934,"journal":{"name":"AAPS Journal","volume":"27 1","pages":"25"},"PeriodicalIF":5.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142958435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Simultaneous Quantification of Total Antibody and Conjugated Payload for DS001 in Rat Serum Using a Hybrid Immuno-Capture LC-MS/MS.","authors":"Xiong Yu, Weiqiang Li, Wensi Huang, Bo Xiao, Jing Long, Qi Wang, Guifeng Wang, Chunhe Wang, Mingming Yu, Jinghua Yu, Xingxing Diao","doi":"10.1208/s12248-024-01007-4","DOIUrl":"10.1208/s12248-024-01007-4","url":null,"abstract":"<p><p>Antibody-drug conjugates (ADCs) are intricate compounds that pose significant challenges in bioanalytical characterization. Therefore, multiple bioanalytical methods are required to comprehensively elucidate their pharmacokinetic (PK) profiles. In this study, we investigated DS001, an ADC consisting of a humanized monoclonal antibody (hRS7), a cleavable chemical linker, and the microtubule inhibitor monomethyl auristatin E (MMAE), with a drug-to-antibody ratio (DAR) of 8. This study established a rapid and sensitive hybrid immunoaffinity liquid-chromatography-tandem-mass-spectrometry (LC-MS/MS) approach for the simultaneous quantification of the total antibody and the enzymatically cleavable conjugated payload of DS001. This method is capable of monitoring fluctuations in average DAR values during PK assessments. The sample preparation procedure involved immunocapture, denaturation, trypsin digestion, papain digestion, and termination, all completed within a total processing time of less than 4 h. The method demonstrated linearity for the total antibody in the range of 100 ng/mL (lower-limit-of-quantification, LLOQ) to 100,000 ng/mL, and for the conjugated payload from 3.495 ng/mL (LLOQ) to 3495 ng/mL in rat serum. Both analytes exhibited standard curve correlation coefficients (r) greater than 0.990 within their respective linear ranges. The precision and accuracy of the method were within ± 15% (± 20% for LLOQ). The verified LC-MS/MS approach was successfully employed in the PK analysis following intravenous administration of 0.2 mg/kg DS001 in rats via tail vein injection.</p>","PeriodicalId":50934,"journal":{"name":"AAPS Journal","volume":"27 1","pages":"23"},"PeriodicalIF":5.0,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142958406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}