On May 26, 2022 Biotheryx, Inc., a clinical stage company discovering and developing a portfolio of innovative small molecule targeted protein degraders (TPDs) in areas of high unmet medical need, reported that its abstract highlighting supportive preclinical data for its lead asset BTX-1188, a potentially first-in-class, dual protein degrader of GSPT1 and IKZF1/3, will be presented in a poster at the 2022 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting taking place June 3-7, 2022, in Chicago, Illinois and virtually (Press release, BioTheryX, MAY 26, 2022, View Source [SID1234615139]).
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"Our distinctive PRODEGY platform is designed to enable the discovery and development of a broad range of targeted protein degrader molecules and BTX-1188 is the first of our pipeline to enter the clinic," said Leah Fung, Ph.D., Chief Scientific Officer of Biotheryx. "BTX-1188 is a molecular glue that was rationally designed to degrade GSPT1 and IKZF1/3. The data being presented at ASCO (Free ASCO Whitepaper) 2022 support the ongoing Phase 1 clinical trial evaluating BTX-1188 in patients with hematologic and solid tumor cancers and demonstrate what we believe to be our ability to design first-in-class molecular glues with the potential to improve clinical outcomes for patients with cancer and other serious diseases."
"We are leveraging our deep expertise with the modulation of Cereblon, the only clinically and commercially validated E3 ligase, to design innovative targeted protein degraders with the potential to address significant unmet medical need," said Philippe Drouet, President and Chief Executive Officer of Biotheryx. "We look forward to presenting these pre-clinical data from our lead program, BTX-1188, at ASCO (Free ASCO Whitepaper) 2022."
Key Highlights from BTX-1188 Preclinical Results
BTX-1188 has shown deep and durable degradation of GSPT1 and IKZF1/3 and inhibition of MYC in several types of hematologic and solid tumor cell lines, including lymphoma, diffuse large B-cell lymphoma, non-small cell lung cancer and glioma.
BTX-1188 has shown inhibition of pro-inflammatory cytokines and enhancement of immune stimulatory cytokines, owing to IKZF1/3 degradation, which may prevent the known systemic inflammatory dose-limiting toxicities associated with pure GSPT1 degradation (Uy 2019)[1].
BTX-1188 potently inhibits tumor cell proliferation and tumor growth in ex vivo and in vivo models of acute myeloid leukemia (AML) and in in vitro and in vivo models of lung, breast and ovarian cancer.
These preclinical results support the ongoing Phase 1 clinical evaluation of BTX-1188 in patients with AML and certain solid tumors, especially in MYC-dependent cancers.
Details for the BTX-1188 ASCO (Free ASCO Whitepaper) 2022 poster presentation are as follows:
Title: BTX-1188, a first-in-class dual degrader of GSPT1 and IKZF1/3, for treatment of acute myeloid leukemia (AML) and solid tumors
Presenter: Aparajita Hoskote Chourasia, Ph.D.
Abstract Number: 7025
Poster Number: 256
Session: Hematologic Malignancies—Leukemia, Myelodysplastic Syndromes, and Allotransplant
Date and Time: Saturday, June 4, 2022 at 9:00 a.m. CT (10:00 a.m. ET)
This poster presentation will be available on the ASCO (Free ASCO Whitepaper) Meeting website. Following the presentation at the meeting, a PDF copy of the poster will be available in the "Publications and Presentations" section of Biotheryx’s website.
About BTX-1188
Biotheryx’s lead molecular glue drug candidate BTX-1188 is a dual protein degrader which was designed to degrade GSPT1, a promising cancer target, and IKZF1/3 (also known as Ikaros/Aiolos), both clinically validated anti-inflammatory and immunomodulatory targets. Prior literature has demonstrated that degradation of GSPT1 can result in antitumor activity in difficult-to-treat tumors such as acute myeloid leukemia (AML) and in solid tumors, including those that overexpress oncogenic transcription factors, such as MYC, however, prior clinical research by others has shown that administration of a GSPT1-only degrader was associated with dose-limiting toxicities related to the release of pro-inflammatory cytokines. BTX-1188 was specifically designed as a potent degrader of GSPT1 that can also directly block inflammation by degrading IKZF1/3. In preclinical studies conducted by Biotheryx, administration of BTX-1188 led to complete eradication of tumors and extended survival in xenograft models of AML. BTX-1188 also led to potent cell killing in a number of cell lines derived from solid tumors. BTX-1188 is currently being evaluated in a Phase 1 dose-escalation trial in patients with hematologic and solid tumor malignancies.