Study of the CHK1 Inhibitor BBI-355, an ecDNA-directed Therapy (ecDTx), and the RNR Inhibitor BBI-825, in Subjects With Tumors With Oncogene Amplifications

Summary

BBI-355 is an oral, potent, selective checkpoint kinase 1 (or CHK1) small molecule inhibitor in development as an ecDNA (extrachromosomal DNA) directed therapy (ecDTx). BBI-825 is an oral, potent, selective ribonucleotide reductase (or RNR) small molecule inhibitor. This is a first-in-human, open-label, 2-part, Phase 1/2 study to determine the safety profile and identify the maximum tolerated dose and recommended Phase 2 dose of BBI-355 administered as a single agent or in combination with BBI-825 or other select therapies.

Timeline

Start

2023-03-24

Primary completion

2026-03-17

Completion

2026-03-17

Publications

• Background Jones R, Plummer R, Moreno V, Carter L, Roda D, Garralda E, Kristeleit R, Sarker D, Arkenau T, Roxburgh P, Walter HS, Blagden S, Anthoney A, Klencke BJ, Kowalski MM, Banerji U. A Phase I/II Trial of Oral SRA737 (a Chk1 Inhibitor) Given in Combination with Low-Dose Gemcitabine in Patients with Advanced Cancer. Clin Cancer Res. 2023 Jan 17;29(2):331-340. doi: 10.1158/1078-0432.CCR-22-2074.
• Background Italiano A, Infante JR, Shapiro GI, Moore KN, LoRusso PM, Hamilton E, Cousin S, Toulmonde M, Postel-Vinay S, Tolaney S, Blackwood EM, Mahrus S, Peale FV, Lu X, Moein A, Epler J, DuPree K, Tagen M, Murray ER, Schutzman JL, Lauchle JO, Hollebecque A, Soria JC. Phase I study of the checkpoint kinase 1 inhibitor GDC-0575 in combination with gemcitabine in patients with refractory solid tumors. Ann Oncol. 2018 May 1;29(5):1304-1311. doi: 10.1093/annonc/mdy076.
• Background Tang J, Weiser NE, Wang G, Chowdhry S, Curtis EJ, Zhao Y, Wong IT, Marinov GK, Li R, Hanoian P, Tse E, Mojica SG, Hansen R, Plum J, Steffy A, Milutinovic S, Meyer ST, Luebeck J, Wang Y, Zhang S, Altemose N, Curtis C, Greenleaf WJ, Bafna V, Benkovic SJ, Pinkerton AB, Kasibhatla S, Hassig CA, Mischel PS, Chang HY. Enhancing transcription-replication conflict targets ecDNA-positive cancers. Nature. 2024 Nov;635(8037):210-218. doi: 10.1038/s41586-024-07802-5. Epub 2024 Nov 6.
• Background Wu S, Bafna V, Chang HY, Mischel PS. Extrachromosomal DNA: An Emerging Hallmark in Human Cancer. Annu Rev Pathol. 2022 Jan 24;17:367-386. doi: 10.1146/annurev-pathmechdis-051821-114223. Epub 2021 Nov 9.
• Background Turner KM, Deshpande V, Beyter D, Koga T, Rusert J, Lee C, Li B, Arden K, Ren B, Nathanson DA, Kornblum HI, Taylor MD, Kaushal S, Cavenee WK, Wechsler-Reya R, Furnari FB, Vandenberg SR, Rao PN, Wahl GM, Bafna V, Mischel PS. Extrachromosomal oncogene amplification drives tumour evolution and genetic heterogeneity. Nature. 2017 Mar 2;543(7643):122-125. doi: 10.1038/nature21356. Epub 2017 Feb 8.
• Background Lange JT, Rose JC, Chen CY, Pichugin Y, Xie L, Tang J, Hung KL, Yost KE, Shi Q, Erb ML, Rajkumar U, Wu S, Taschner-Mandl S, Bernkopf M, Swanton C, Liu Z, Huang W, Chang HY, Bafna V, Henssen AG, Werner B, Mischel PS. The evolutionary dynamics of extrachromosomal DNA in human cancers. Nat Genet. 2022 Oct;54(10):1527-1533. doi: 10.1038/s41588-022-01177-x. Epub 2022 Sep 19.
• Background Kim H, Nguyen NP, Turner K, Wu S, Gujar AD, Luebeck J, Liu J, Deshpande V, Rajkumar U, Namburi S, Amin SB, Yi E, Menghi F, Schulte JH, Henssen AG, Chang HY, Beck CR, Mischel PS, Bafna V, Verhaak RGW. Extrachromosomal DNA is associated with oncogene amplification and poor outcome across multiple cancers. Nat Genet. 2020 Sep;52(9):891-897. doi: 10.1038/s41588-020-0678-2. Epub 2020 Aug 17.

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Indications