Abstract
Purpose
Isocitrate dehydrogenase enzyme 1 (IDH1) mutations at 132nd amino acid residue (R132*) result in the cellular accumulation of the oncometabolite, 2-hydroxyglutarate (2-HG). IDH305 is an orally bioavailable, brain-penetrant, mutant-selective allosteric IDH1 inhibitor demonstrating target engagement in preclinical models. This first-in human study was designed to identify the recommended dose for expansion/maximum tolerated dose of IDH305 in patients with IDH1R132-mutant acute myeloid leukemia (AML) and myelodysplastic syndrome (MDS).
Methods
IDH305 was given at doses 75–750 mg twice daily in 41 patients with IDH1R132-mutant AML/MDS. Dose escalation was designed using Bayesian hierarchical model with overdose control principle and relationship with dose-limiting toxicity.
Results
IDH305 exhibited rapid absorption with mean T1/2 approximately 4–10 h across doses. Interpatient variability was moderate and exposure increased with dose in a less than dose proportional manner. Most patients (35/41) demonstrated target engagement with reduction in 2-HG concentration at all doses. Complete remission (CR) or CR with incomplete count recovery occurred in 10/37 (27%) patients with AML and 1/ 4 patients with MDS. Adverse events (AEs) suspected to be related to study drug were reported in 53.7% of patients: increased blood bilirubin (14.6%), nausea (14.6%), increased alanine aminotransferase and aspartate aminotransferase (12.2%, each); most frequent grade 3 or 4 AEs were differentiation syndrome and tumor lysis syndrome (n = 3; 7.3%, each). Hepatotoxicity was manageable with dose modification.
Conclusion
Due to potentially narrow therapeutic window, the study was prematurely halted and recommended phase 2 dose could not be declared.
Trial registration
Clinicaltrials.gov identifier: NCT02381886.
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Data availability
Novartis will not provide access to patient-level data if there is a reasonable likelihood that individual patients could be reidentified. Phase 1 studies, by their nature, present a high risk of patient reidentification; therefore, patients’ individual results for phase 1 studies cannot be shared. In addition, clinical data, in some cases, have been collected subject to contractual or consent provisions that prohibit transfer to third parties. Such restrictions may preclude granting access under these provisions. Where co-development agreements or other legal restrictions prevent companies from sharing particular data, companies will work with qualified requestors to provide summary information where possible.
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Acknowledgements
The authors would like to thank the patients who participated in the trial and their families, and the staff at each site who assisted with the study. Medical writing assistance was provided by Kavita Garg, PhD, CMPPTM of Novartis Healthcare Private Limited.
Funding
This study was sponsored by Novartis Pharmaceuticals Corporation.
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Authors and Affiliations
Contributions
Conception and design: CDD and NSP. Development of methodology: XC, YJ, NSP, and JC. Acquisition of data: AH, CDD, KY, and AHW. Analysis and interpretation of data: YJ, CDD, AHW, XC, YJ, NSP, and JC. Writing, review, and/or revision of the manuscript: CDD, AH, MGF, KY, TZ, AK, XC, YJ, NSP, JC, and AHW. Administrative, technical, or material support: NSP and JC. Study supervision: JC and NSP.
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Conflict of interest
CDD: CDD received research funding from AbbVie, Agios, Calithera, Cleave, BMS/Celgene, Daiichi-Sankyo, Forma, ImmuneOnc, Loxo, and received consultancy or advisory board fees from AbbVie, Agios, Aprea, Celgene/BMS, ImmuneOnc, Novartis, and Takeda. AH: research support from BMS, Incyte, Novartis, Pfizer. MGF: research support from Abbvie and Tolero Pharmaceuticals; current employment and equity ownership at Cellectis Inc. NY. KY: research funding from Agensys, Astex, Forma Therapeutics, Genentech, Jazz, Medimmune, Novartis, Onconova, Roche, and Honoraria from Celgene/BMS, Novartis, Otsuka Pfizer, TaiHo, Takeda. TZ: other support from BMS, MSD, Novartis, Roche. AK: Grants from Celgene, Daiichi Sankyo, Roche, and personal fees from Abbvie, BMS, Daiichi Sankyo, Roche. XC: employee of Novartis. YJ: employee of Novartis. NSP: employee of Novartis at time of study conduct and manuscript writing. JC: employee of Novartis. AHW: honoraria from Novartis, Astellas, Pfizer, Macrogenics, AbbVie, Genentech, Servier, Celgene, Amgen, Astra Zeneca and Janssen; research funding from Novartis, Celgene, AbbVie, Servier, Astra Zeneca and Amgen; former employee of the Walter and Eliza Hall Institute and receives a fraction of its royalty stream related to venetoclax.
Ethical approval
The study protocol was approved by the independent ethics committee or institutional review board for each center. The study was conducted according to the principles of the Declaration of Helsinki, and performed in compliance with Good Clinical Practice.
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All the patients provided written informed consent before participation in the clinical trial.
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All the authors have read and approved the final manuscript for submission to “Journal of Cancer Research and Clinical Oncology”.
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DiNardo, C.D., Hochhaus, A., Frattini, M.G. et al. A phase 1 study of IDH305 in patients with IDH1R132-mutant acute myeloid leukemia or myelodysplastic syndrome. J Cancer Res Clin Oncol 149, 1145–1158 (2023). https://doi.org/10.1007/s00432-022-03983-6
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DOI: https://doi.org/10.1007/s00432-022-03983-6