ArticleMolecular cancer therapeutics2025
Efficacy of ATR Kinase Inhibitor Elimusertib Monotherapy or Combination in Tumors with DNA Damage Response Pathway and Other Genomic Alterations.
Article in Molecular cancer therapeutics, 2025. 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.
- ATM counteracts chromatin-bound cGAS during DNA replication.Nature cell biology · 2026Article
- Synthetic lethality in cancer therapy: Mechanisms, models and clinical translation for overcoming therapeutic resistance.Clinical and translational medicine · 2026Review
- Therapeutic challenges in HER2-targeted antibody therapies: trastuzumab and its ADC derivatives in breast cancer.American journal of cancer research · 2025Review
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Authors and funding
15 authors.
Funding
Abstract
The ataxia telangiectasia and RAD3-related (ATR) kinase functions with ataxia telangiectasia-mutated (ATM) kinase as a modulator of DNA damage response (DDR). We assessed the antitumor effects of the ATR inhibitor elimusertib (BAY-1895344) in patient-derived xenograft (PDX) models with DDR alterations. Antitumor activity was assessed by change in tumor volume (TV) from baseline. Responses were categorized as follows: partial response (PR), ≥30% decrease in TV; ≥20% increase in TV, progressive disease; and non-PR/progressive disease, stable disease (SD). Event-free survival was defined as time for tumor doubling (EFS-2). Of 21 PDX models tested, 11 had significant prolongation of EFS-2 with elimusertib monotherapy. Four models had a PR and four had SD. PR/SD was observed in two of five models with ATM loss on IHC and in models with a variety of alterations in DDR genes, including BRCA1/2 and ATM. Elimusertib prolonged EFS-2 in three of five models with known PARP inhibitor resistance. Pharmacodynamic studies conducted in four PDX models showed an increase in DNA damage markers. PI3K/mTOR pathway signaling increased in two of four models. The combination of the PI3K inhibitor copanlisib with elimusertib enhanced EFS-2 compared with monotherapy in three of 11 models tested. The combination of elimusertib with the PARP inhibitor niraparib enhanced antitumor activity compared with single agents in PARP-resistant PDX models. Our study shows that ATR inhibition has antitumor activity, including in models with both intrinsic and acquired PARP inhibitor resistance. Further work is needed to better refine patient selection for ATR-based therapies.
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