NCT07676331 Letrozole Hormone receptor positive breast cancer Clinical Landscape Report 2026: Design, Endpoints, Sponsor and Readout Outlook
Turn a newly registered trial into a decision-ready clinical landscape. This report examines NCT07676331 using PatSnap Clinical Trials MCP for protocol design and endpoint evidence, with Drug & Asset MCP and Company & Deal Intelligence MCP used as the companion asset and sponsor enrichment workflow. Explore PatSnap MCP Servers to reproduce the research sequence inside an AI workflow.
MCP evidence snapshot: 21 July 2026. Trial records, recruitment status and projected dates can change after the snapshot and should be rechecked before operational decisions.
Why NCT07676331 is a hot trial to watch
Hormone receptor positive breast cancer is being segmented by mechanism, treatment setting, geography and endpoint architecture. NCT07676331 is notable because it evaluates Letrozole in a Phase 2 design sponsored by Universitaire Ziekenhuizen KU Leuven. The main development question is whether the protocol can translate its rationale into a clinically interpretable and operationally credible readout.
Trial landscape snapshot
| Field | Indexed detail |
|---|---|
| Registration | NCT07676331 |
| Official title | Clinical Study of Local and Systemic Biological Impact of GLP1/GIP-Receptor Agonists in Patients With Breast Cancer: The CLARA Trial (CLARA) |
| Phase / status | Phase 2 / Not yet recruiting |
| Intervention | Letrozole |
| Sponsor | Universitaire Ziekenhuizen KU Leuven |
| Geography | Not reported in the indexed record |
| Enrollment | 168 |
| Primary endpoint | Ki67 proliferation marker |
| Endpoint time frame | From enrollment till time of surgery (4-5 weeks) |
| Primary completion / readout proxy | 2028-03-01 |
Protocol design and endpoint interpretation
The CLARA trial is a phase II window-of-opportunity trial evaluating how a commonly used weight-loss medication (tirzepatide, a GLP-1/GIP receptor agonist) affects breast cancer biology, alone and in combination with standard hormone therapy (letrozole). The main goal is to determine whether tirzepatide, alone or combined with letrozole, reduces tumor cell growth.
Allocation is Randomized, masking is None (Open Label), and the intervention model is Parallel Assignment. Planned enrollment of 168 participants across Not reported in the indexed record shapes statistical precision, execution risk and external validity. Interpretation should account for baseline risk, prior therapy, assessment schedule, missing-data handling and clinical relevance—not only statistical significance.
- Ki67 proliferation marker (From enrollment till time of surgery (4-5 weeks)) — The primary endpoint is the mean change in log-transformed KI67 expression values between baseline and time of surgery in the different arms
Readout outlook and evidence gap
The current protocol points to 2028-03-01 as the best available readout proxy. Because this is an active or newly posted study, a trial-specific result citation is not included until a normalized clinical-trial-result record becomes available. That gap is itself operationally important: teams should monitor first result indexing, conference abstracts, protocol amendments and changes to the primary-completion date.
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Asset and sponsor context
Trial-sourced asset: Letrozole. The Drug & Asset MCP enrichment step is designed to add normalized targets, modality and global development status when an exact asset match is available.
Trial-sourced sponsor: Universitaire Ziekenhuizen KU Leuven. Company & Deal Intelligence MCP is the companion workflow for resolving organization identity, corporate profile and partnering context.
The sponsor profile matters because scientific rationale alone does not determine development value. Manufacturing readiness, portfolio fit, geographic reach, partnering capacity and the ability to fund confirmatory development can determine whether a positive signal becomes a competitive asset.
White space around this program
- Sharper patient selection: prospective biomarker or phenotype definitions that identify who is most likely to benefit.
- Clinically interpretable endpoints: outcomes connecting activity with function, symptoms, survival or treatment burden.
- Comparator relevance: evidence against the most decision-relevant contemporary standard of care.
- Broader external validity: evidence across additional geographies, demographic groups and real-world settings.
- Operational differentiation: a development path that closes the readout gap without sacrificing safety or durability.
What to monitor next
Monitor recruitment, enrollment changes, protocol amendments, endpoint hierarchy, primary-completion timing, first result indexing, asset ownership and sponsor partnerships. A change in endpoint, population or ownership can alter the probability of success before a headline data release.
Bottom line
NCT07676331 provides a focused lens on Hormone receptor positive breast cancer development. Its value will be determined by whether Letrozole can convert the current Phase 2 design into evidence that is clinically meaningful, operationally credible and differentiated from competing programs.
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