On November 2, 2021 BioTheryX, Inc., a clinical-stage company focused on targeted protein degradation to create life-saving medicines, reported that the U.S. Food and Drug Administration (FDA) cleared the company to proceed with a Phase 1 clinical trial of BTX-1188 in hematologic and solid malignancies (Press release, BioTheryX, NOV 2, 2021, View Source [SID1234596452]).
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BTX-1188 is a novel oral small molecule cereblon binder that has immunomodulatory properties and promotes the degradation of a neosubstrate G1 to S phase transition 1 (GSPT1), a translation termination factor, as well as IKZF1/3, zinc finger transcription factors important in hematological function. By degrading multiple proteins including GSPT1 and IKZF1/3, BTX-1188’s profile is expected to be differentiated from protein degraders that exclusively target GSPT1. BTX-1188 has demonstrated promising preclinical activity against a variety of leukemias and solid tumors.
"The FDA clearance to begin our Phase 1 study for BTX-1188 is a major milestone for BioTheryX, which represents our first molecular glue to enter clinical development, and the second IND clearance for our pipeline," said Zung Thai, M.D., Ph.D., Chief Medical Officer of BioTheryX. "We plan to study BTX-1188 in patients with hematological and solid malignancies who have limited treatment options and for whom new therapies are desperately needed. We expect to initiate patient enrollment in the Phase I study by year end."
The Phase I clinical trial is designed to assess the safety and tolerability of BTX-1188 and to determine the recommended Phase 2 dose. Following determination of the recommended Phase 2 dose, the company plans to further evaluate the safety and efficacy of BTX-1188 in expansion cohorts in both hematological and solid tumor malignancies.