ArticleCancer chemotherapy and pharmacology2024
Non-linear IV pharmacokinetics of the ATR inhibitor berzosertib (M6620) in mice.
Article in Cancer chemotherapy and pharmacology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Transient ATR inhibition following ionizing radiation enhances immune-mediated antitumor response and survival.bioRxiv : the preprint server for biology · 2026Article
- Repurposing Drugs for Malaria through a Human Dose Prediction: A Case Study with Berzosertib.Clinical pharmacology and therapeutics · 2026Article
- Comparative in vivo toxicology of ATR inhibitors ceralasertib, elimusertib, and berzosertib alone and in combination with ionizing radiation.Toxicology and applied pharmacology · 2025Article
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8 authors.
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Abstract
backgroundThe Ataxia Telangiectasia and Rad3-related (ATR) protein complex is an apical initiator of DNA damage response pathways. Several ATR inhibitors (ATRi) are in clinical development including berzosertib (formerly M6620, VX-970). Although clinical studies have examined plasma pharmacokinetics (PK) in humans, little is known regarding dose/exposure relationships and tissue distribution. To understand these concepts, we extensively characterized the PK of berzosertib in mouse plasma and tissues.
methodsA highly sensitive LC-MS/MS method was utilized to quantitate berzosertib in plasma and tissues. Dose proportionality was assessed in female BALB/c mice following single IV doses (2, 6, 20 or 60 mg/kg). A more extensive PK study was conducted in tumor-bearing mice following a single IV dose of 20 mg/kg to evaluate distribution to tissues. PK parameters were calculated by non-compartmental analysis (NCA). A compartmental model was developed to describe the PK behavior of berzosertib. Plasma protein binding was determined in vitro.
resultsIncreased doses of berzosertib were associated with less than proportional increases in early plasma concentrations and greater than proportional increase in tissue exposure, attributable to saturation of plasma protein binding. Berzosertib extensively distributed into bone marrow, tumor, thymus, and lymph nodes, however; brain and spinal cord exposure was less than plasma.
conclusionThe nonlinear PK of berzosertib displayed here can be attributed to saturation of plasma protein binding and occurred at concentrations close to those observed in clinical trials. Our results will help to understand preclinical pharmacodynamic and toxicity data and to inform optimal dosing and deployment of berzosertib.
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