Phase 1 study for people with Breast Cancer
Recruiting Phase 1
This trial at a glance
Where this trial is running
| Site | City | State or country | Status at this site |
|---|---|---|---|
| Blacktown Cancer and Haematology Centre | Blacktown | NSW | Recruiting |
| Southern Highlands Private Hospital | Bowral | NSW | Recruiting |
| Concord Repatriation General Hospital | Concord | NSW | Recruiting |
| Macquarie University | North Ryde | NSW | Recruiting |
| Townsville University Hospital | Douglas | QLD | Recruiting |
| Genesiscare St Andrews | Adelaide | SA | Recruiting |
| Austin Health | Heidelberg | VIC | Completed |
| Peter Maccallum Cancer Centre | Melbourne | VIC | Recruiting |
voxsanity.com.au · trial sites from public registries · registry record synced 15 October 2026 · not medical advice
Who can join
The official eligibility criteria
Registry text, reproduced exactly. These are the words the trial's sponsor published on ClinicalTrials.gov. They have not been edited, shortened or rewritten, and they are written for researchers rather than for patients.
Inclusion Criteria:
* Phase 1a (Dose Escalation): Participants with histologically or cytologically confirmed advanced, metastatic, or unresectable solid tumors associated with dependency on CDK4, including HR+ breast cancer, ovarian cancer, endometrial cancer, non-small cell lung cancer, and others. For combination with elacestrant, participants must have received at least 1 prior line of treatment for advanced/metastatic disease including prior endocrine therapy and CDK4/6 inhibitor in either the adjuvant or advanced/metastatic setting.
* Phase 1a Safety Expansion: For combination with fulvestrant in regions where approved and available, participants with HR+ breast cancer must have received at least 1 prior line of treatment including endocrine therapy and a CDK4/6 inhibitor. For combination with letrozole, participants must be CDK4/6 inhibitor treatment naïve and have not received any previous systemic treatment for advanced disease.
* Phase 1b: Participants with HR+/HER2- breast cancer.
* Phase 1b: For combination with fulvestrant, participants with HR+/HER2- breast cancer enrolled in regions where CDK4/6 inhibitors are approved and available must have received 1-2 lines of therapy for advanced/metastatic disease including endocrine therapy and a CDK4/6 inhibitor. Participants can have received up to 2 lines of prior cytotoxic chemotherapy for advanced disease. For combination cohorts with letrozole, participants must be CDK4/6 inhibitor treatment naïve and have not received any previous systemic treatment for advanced disease.
* Stable Eastern Cooperative Oncology Group (ECOG) Performance Status ≤ 1.
* Female participants with metastatic HR+/HER2- breast cancer must be postmenopausal or receiving ovarian function suppression treatment.
* Adequate organ function without symptomatic visceral disease.
Exclusion Criteria:
* Known leptomeningeal disease or uncontrolled, untreated brain metastases.
* Any malignancy ≤ 3 years before the first dose of study treatment(s) except for the specific cancer under investigation in this study and any locally recurring cancer that has been treated with curative intent (eg, resected basal or squamous cell skin cancer, superficial bladder cancer, or carcinoma in situ of the cervix or breast).
* Uncontrolled diabetes.
* Infection requiring systemic antibacterial, antifungal, or antiviral therapy ≤ 28 days before the first dose of study drug(s), or symptomatic COVID-19 infection.
* Participants with untreated chronic hepatitis B or chronic hepatitis B virus (HBV) carriers with HBV DNA ≥ 500 IU/mL (or ≥ 2500 copies/mL) at screening.
* Participants with active hepatitis C infection.
* Prior allogeneic stem cell transplantation, or organ transplantation.
Note: Other protocol defined Inclusion/Exclusion criteria may apply.
Dates on the record
Results, publications and the official record
- No results are posted on the official record yet.
- No publications are listed on the official record yet.
- Official record and contacts on ClinicalTrials.gov – contact details for each site are kept there, and are not copied onto this page.
Sources and dates
- ClinicalTrials.gov – the record this page reformats
- ClinicalTrials.gov processing date: 15 October 2026.
- This page last checked by Voxsanity: 15 October 2026.
Voxsanity reformats data from public registries into this layout. It does not edit, interpret or add to what the registry published.
Not medical advice.
Individual trial records are refreshed on a rolling basis rather than all at once, so a record may be up to several weeks old. Each trial page and trial card shows the date its own record was last synced. Where a record has lagged, its status, sites and enrolment can differ from the current registry state in either direction, so check the registry link on the trial page before acting on them.
Letter for your doctor
A one-page summary of this trial to print or email to your GP. It carries the registry's own record of the trial and its eligibility criteria, and nothing Voxsanity has written about whether it suits you.