Efficacy data remain consistent with previous disclosures, showing 10.3-month median PFS in all patients and 11.4-month median PFS in 2L patients
Subset analyses show broad activity in patients with PI3Kα-mutated, HR+/HER2- metastatic breast cancer, regardless of prior fulvestrant or other SERD exposure, or ESR1 mutation status
Phase 3 ReDiscover-2 trial in CDK4/6-experienced breast cancer ongoing
Dec. 12, 2025 -- Relay Therapeutics, Inc. (Nasdaq: RLAY), a clinical-stage, small molecule precision medicine company developing potentially life-changing therapies for patients living with cancer and genetic disease, today announced a subset analysis of interim clinical data for zovegalisib (RLY-2608), the first known investigational allosteric, pan-mutant and isoform-selective inhibitor of PI3Kα. These data are being presented today at the 2025 San Antonio Breast Cancer Symposium (SABCS).
“Data presented today demonstrate the robust activity of zovegalisib + fulvestrant across subgroups of patients whose baseline characteristics are known to affect outcomes, such as prior fulvestrant or SERD and ESR1 mutation status,” said Don Bergstrom, M.D., Ph.D., President of R&D at Relay Therapeutics. “The broad range of activity highlights the importance of selectively targeting the driver of disease, mutant PI3Kα, and gives us confidence that the data observed to date should translate to our ongoing Phase 3 trial, ReDiscover-2.”
Zovegalisib is currently being evaluated in ReDiscover, an ongoing first-in-human study, which was designed to evaluate the safety, tolerability, pharmacokinetics, pharmacodynamics and preliminary antitumor activity of zovegalisib in combination with fulvestrant, and in combination with fulvestrant and CDK inhibitors.
As of the data cut-off date of October 15, 2025, 118 patients had enrolled into the zovegalisib + fulvestrant arm of the ReDiscover study. Across all doses, all patients had received a significant level of prior therapy in the advanced setting, including at least one prior endocrine therapy and at least one prior CDK4/6 inhibitor. Among the 64 patients who received 600mg twice daily (BID) fasted, 44% of patients (n=28) had received two or more prior lines of therapy, 52% of patients (n=33) had received prior SERD (includes fulvestrant or oral SERD), and 29% of patients (n=18) had detectable ESR1 mutations at baseline.
The data cut-off date was October 15, 2025 for this analysis. The total efficacy population consisted of 52 zovegalisib + fulvestrant patients who received 600mg BID fasted and did not have a PTEN or AKT co-mutation. Median follow-up was 20.2 months.
The median progression free survival (PFS) was 10.3 months for all patients. Among the total of 31 patients with measurable disease, objective response rate (ORR) was 39%. For second line (2L) patients, median PFS was 11.4 months and ORR was 47%.
Efficacy was generally consistent across other subsets of patients. For patients who received prior SERD, median PFS was 11.4 months and ORR was 44% (7/16), and for patients who had a detectable ESR1 mutation at baseline, median PFS was 8.8 months and ORR was 60% (6/10).
The overall tolerability profile remained consistent with mutant-selective PI3Kα inhibition, with treatment-related adverse events that were mostly low-grade, manageable and reversible.
Breast Cancer
Continued enrollment of Phase 3 ReDiscover-2 trial of zovegalisib + fulvestrant in PI3Kα-mutated, CDK4/6 pre-treated, HR+/HER2- advanced breast cancer
Continued dose escalation in Phase 1/2 ReDiscover trial, advancing triplet cohorts that will inform which regimen could be used in a future frontline metastatic trial
Vascular Malformations
Continued enrollment of ongoing Phase 1/2 ReInspire clinical trial in vascular malformations
Zovegalisib is the lead program in Relay Therapeutics’ efforts to discover and develop mutant selective inhibitors of PI3Kα, the most frequently mutated kinase in all cancers and all vascular malformations. Zovegalisib has the potential, if approved, to address nearly 500,000 patients in the United States, one of the largest patient populations for a precision medicine.
Traditionally, the development of PI3Kα inhibitors has focused on the active, or orthosteric, site. The therapeutic index of orthosteric inhibitors is limited by the lack of clinically meaningful selectivity for mutant versus wild-type (WT) PI3Kα and off-isoform activity. Toxicity related to inhibition of WT PI3Kα and other PI3K isoforms results in sub-optimal inhibition of mutant PI3Kα with reductions in dose intensity and frequent discontinuation. The Dynamo® platform enabled the discovery of zovegalisib, the first known allosteric, pan-mutant, and isoform-selective PI3Kα inhibitor, designed to overcome these limitations. Relay Therapeutics solved the full-length cryo-EM structure of PI3Kα, performed computational long time-scale molecular dynamic simulations to elucidate conformational differences between WT and mutant PI3Kα, and leveraged these insights to support the design of zovegalisib. Zovegalisib is currently being evaluated in multiple metastatic breast cancer studies and a first-in-human study designed to treat patients with PIK3CA (PI3Kα) mutation driven vascular malformations.
Relay Therapeutics (Nasdaq: RLAY) is a clinical-stage, small molecule precision medicine company developing potentially life-changing therapies for patients living with cancer and genetic disease. Relay's Dynamo® platform integrates an array of leading-edge computational and experimental approaches designed to drug protein targets that have previously been intractable or inadequately addressed. The company’s lead clinical asset, zovegalisib, is the first pan-mutant selective PI3Kα inhibitor to enter clinical development and is currently in a Phase 3 clinical trial (ReDiscover-2) in HR+/HER2- metastatic breast cancer. Zovegalisib is also being investigated in a group of genetic disease indications called PI3Kα-driven vascular malformations. Relay's pipeline also includes late-stage research programs for NRAS-driven solid tumors and Fabry disease.
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