Study for people with Breast Cancer

Recruiting Not a phased study

Sources: ClinicalTrials.gov Checked: 15 October 2026 Not medical advice

This trial at a glance

Status Recruiting
Phase Not a phased study
Sponsor Ontario Clinical Oncology Group (OCOG)
Registry number NCT05866458
Started 12 March 2024 Today 16 October 2026 Estimated completion 1 October 2031

Where this trial is running

Trial sites and the status recorded for each
SiteCityState or countryStatus at this site
Tweed Valley Hospital Cudgen NSW Recruiting
Liverpool Hospital Liverpool NSW Recruiting
Mater Hospital Sydney North Sydney NSW Recruiting
Westmead Hospital Westmead NSW Recruiting
Royal Brisbane and Women's Hospital Herston QLD Recruiting
Princess Alexandra Hospital Woolloongabba QLD Recruiting
Monash Medical Centre -Moorabbin Bentleigh East VIC Recruiting
Victorian Breast & Oncology Care (VBOC) East Melbourne VIC Recruiting
Peter MacCallum Cancer Centre Melbourne VIC Recruiting
St. Vincent's Hospital Melbourne Melbourne VIC Recruiting
Sir Charles Gairdner Hospital Nedlands WA Recruiting
Maroondah Hospital Box Hill VIC Recruiting
Royal Perth Hospital Perth WA Recruiting
Prince of Wales Hospital Randwick NSW Recruiting
Latrobe Regional Health Traralgon VIC Recruiting

voxsanity.com.au · trial sites from public registries · registry record synced 15 October 2026 · not medical advice

Who can join

Age 50 Years and over
Sex Female participants only
Healthy volunteers Not accepted
Enrolment target 352

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:

1. Female patient with a new histological diagnosis of clinical T1-3 N0 breast cancer (any tumour sub-type).

2. Negative lymph node involvement at initial presentation, documented by imaging (US or MRI), fine needle aspiration (FNA) or core needle biopsy.

3. Treated with a minimum of 8 weeks NAC, with patients with Her2+ disease receiving targeted anti-Her2+ therapy.

4. Marker clip placed in the tumour bed prior to or during neoadjuvant chemotherapy when the tumour can still be identified.

5. Treated by BCS with complete excision of the tumour bed and axillary staging surgery (either sentinel lymph node biopsy or axillary lymph node dissection).

6. Final pathology demonstrating a pCR \[defined as absence of residual invasive and in-situ breast cancer within the breast or lymph nodes (ypT0N0)\].

Exclusion Criteria:

1. Age less than 50 years.

2. Inflammatory breast cancer or breast cancer invading the skin or chest wall (T4 disease).

3. Multicentric disease (i.e., breast cancer involving more than one quadrant in the same breast).

4. Prior history of ipsilateral or contralateral in-situ or invasive breast cancer. Patients with a history of lobular carcinoma in-situ (LCIS) are ineligible.

5. Synchronous contralateral in-situ or invasive breast cancer.

6. BRCA (breast cancer gene) 1 or 2 genetic mutation carrier, or other genetic mutation present associated with increased risk of breast cancer.

7. Other previous non-breast malignancies except adequately treated non-melanoma skin cancers, in situ cancers or other cancers curatively treated with no evidence of disease for ≥ 5 years.

8. Inability to complete entire course of neoadjuvant therapy (minimum of 8 weeks of treatment).

9. Patients with HR+ (hormone receptor) disease who are not planned to have endocrine therapy initiated.

10. Patients with Her2+ disease who have not received or are not planned to receive Her2 targeted therapy.

11. ECOG (Eastern Cooperative Oncology Group) performance status \> 3.

12. Inability to provide informed consent.

Dates on the record

Started 12 March 2024
Estimated completion 1 October 2031
Registry last updated 13 October 2026
Checked by Voxsanity 15 October 2026

Results, publications and the official record

Sources and dates

  • ClinicalTrials.gov – the record this page reformats
  • ClinicalTrials.gov processing date: 13 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.