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A Phase 3 Open-label Randomized Study Assessing the Efficacy and Safety of RLY-2608 + Fulvestrant Versus Capivasertib + Fulvestrant as Treatment for PIK3CA-mutant Hormone Receptor Positive, Human Epidermal Growth Factor Receptor 2 Negative (HR+/HER2-) Locally Advanced or Metastatic Breast Cancer Following Recurrence or Progression On or After Treatment with a CDK4/6 Inhibitor

Status
Recruiting
Phases
Phase 3
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2025-523083-21-00
Acronym
RLY-2608-102
Enrollment
272
Registered
2025-11-11
Start date
2025-12-08
Completion date
Unknown
Last updated
2025-11-17

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

PIK3CA-mutant Hormone Receptor Positive, Human Epidermal Growth Factor Receptor 2 Negative (HR+/HER2-) Locally Advanced or Metastatic Breast Cancer

Brief summary

PFS is defined as the time from randomization until radiographic progression per RECIST v1.1, or death due to any cause.

Detailed description

OS is defined as the time from randomization to the date of death by any cause., PFS is defined as the time from randomization until radiographic progression per RECIST v1.1, or death due to any cause., ORR is defined as the percentage of participants with CR or PR per RECIST v1.1., DOR is defined as the time from the date of first documented response per RECIST v1.1 until date of documented progression or death in the absence of disease progression., CBR is defined as the percentage of participants who achieved CR or PR at any time or SD maintained for ≥24 weeks per RECIST v1.1 (without subsequent therapy) after randomization., • Frequency, severity, timing, and relationship to RLY-2608/fulvestrant or capivasertib/fulvestrant of any AEs, SAEs, changes in vital signs, ECGs, and safety laboratory tests. All AEs and SAEs will be collected and graded according to the NCI CTCAE, Version 5.0. • Dose intensity. • Dose modification., Plasma concentrations of RLY-2608 (and its metabolites as appropriate)., Evaluation of EORTC QLQ-C30, EORTC QLQ-BR23 scale/item scores including change from baseline and time to deterioration., Health state utility data for economic evaluation will be derived by using the EQ-5D-5L health state utility index.

Interventions

DRUGFulvestrant Dr. Reddy’s 250 mg Solution For Injection in Pre-Filled Syringe
DRUGFulvestrant Dr. Reddys 250 mg solución inyectable en jeringa precargada EFG
DRUGFulvestrant EVER Pharma 250 mg solution for injection in pre-filled syringe

Sponsors

Relay Therapeutics Inc.
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
All
Age
18 Years to No maximum

Design outcomes

Primary

MeasureTime frame
PFS is defined as the time from randomization until radiographic progression per RECIST v1.1, or death due to any cause.

Secondary

MeasureTime frame
OS is defined as the time from randomization to the date of death by any cause., PFS is defined as the time from randomization until radiographic progression per RECIST v1.1, or death due to any cause., ORR is defined as the percentage of participants with CR or PR per RECIST v1.1., DOR is defined as the time from the date of first documented response per RECIST v1.1 until date of documented progression or death in the absence of disease progression., CBR is defined as the percentage of participants who achieved CR or PR at any time or SD maintained for ≥24 weeks per RECIST v1.1 (without subsequent therapy) after randomization., • Frequency, severity, timing, and relationship to RLY-2608/fulvestrant or capivasertib/fulvestrant of any AEs, SAEs, changes in vital signs, ECGs, and safety laboratory tests. All AEs and SAEs will be collected and graded according to the NCI CTCAE, Version 5.0. • Dose intensity. • Dose modification., Plasma concentrations of RLY-2608 (and its metabolites as a

Countries

Austria, Belgium, Bulgaria, Czechia, Denmark, France, Germany, Greece, Hungary, Italy, Netherlands, Poland, Portugal, Spain

Outcome results

None listed

Source: EU CTIS · Data processed: Feb 4, 2026