← Back to Clinical Trials
Recruiting NCT06401421

NCT06401421 EXActDNA-003 / NSABP B-64: Study of Molecular Residual Disease Detection in Breast Cancer (MRD)

◆ AI Clinical Summary
Plain-language summary for patients
Clinical Trial Summary
NCT ID NCT06401421
Status Recruiting
Phase —
Sponsor Exact Sciences Corporation
Condition Breast Cancer
Study Type OBSERVATIONAL
Enrollment 1,800 participants
Start Date 2024-06-07
Primary Completion 2030-04

Eligibility & Interventions

Sex All sexes
Min Age 18 Years
Max Age N/A
Study Type OBSERVATIONAL
Interventions
ctDNA MRD test

Eligibility Fast-Check

Enter your details for a quick preliminary check. This does not replace medical advice.

What to Expect as a Participant

This is an observational study. You will not receive an experimental treatment; researchers will collect data based on your existing condition or standard treatment.

This trial targets 1,800 participants in total. It began in 2024-06-07 with a primary completion date of 2030-04.

⚠ This information is for research awareness only. Always consult your physician before joining any clinical trial. Participation is voluntary and you may withdraw at any time.

Brief Summary

The EXActDNA-003 study will prospectively enroll participants who are planning to undergo chemotherapy for high-risk, early breast cancer, who are willing to provide tissue and blood specimens for circulating tumor DNA (ctDNA) analysis. Participants will be followed for up to 5.5 years.

Eligibility Criteria

Inclusion Criteria: 1. The participant or a legally authorized representative must provide study-specific informed consent prior to study entry. 2. The participant must be ≥ 18 years of age. 3. ECOG performance status 0 or 1. 4. Histologically confirmed invasive carcinoma of the breast. 5. Planned neoadjuvant therapy which includes cytotoxic chemotherapy. 6. Tumor size ≥ 2.1 cm in greatest diameter. 7. Unifocal or multifocal cancer documented to be the same histologic clinical subtype. 8. Clinically node positive or if node negative, any one of the following: 1. TNBC or HER2+ subtype 2. HR+/HER2-negative with at least one of the following: i. High tumor grade (G3) ii. Ki67 index of 20% or higher iii. High genomic risk (Oncotype DX® (ODX) Breast Recurrence Score of \> 25, MammaPrint® High, etc.) 9. Willing and able to comply with the study requirements, which includes the collection of a total of 34 cc (2.5 Tablespoons) of blood for each research blood draw. 10. Available residual tissue from diagnostic biopsy from the breast or an involved ipsilateral lymph node for submission to create a bespoke ctDNA assay. Exclusion Criteria: 1. Definitive clinical or radiologic evidence of metastatic disease. 2. Initiated neoadjuvant therapy for current breast cancer diagnosis. 3. Synchronous diagnosis of another invasive cancer, other than this breast cancer, except for non-melanoma skin cancers. 4. Completed all therapy (including endocrine therapy) \<5 years ago for any previous invasive solid organ malignancy (with exception of non-melanoma skin cancers) including prior breast cancer. Individuals with a prior history of noninvasive (in situ) carcinomas may participate if they have received definitive treatment. 5. Completed all therapy for any previous hematologic malignancy \< 5 years ago. 6. Multicentric or contralateral invasive breast cancers. 7. Known pregnancy at time of enrollment. 8. Prior solid organ transplant. 9. Prior allogeneic hematopoietic stem cell transplant.

Contact & Investigator

Central Contact

NSABP Department of Site and Study Management Department of Site and Study Management

✉ industry.trials@nsabp.org

📞 1-800-270-3165

Frequently Asked Questions

Who can join the NCT06401421 clinical trial?

This trial is open to participants of all sexes, aged 18 Years or older, studying Breast Cancer. Full inclusion and exclusion criteria are listed in the Eligibility Criteria section. Always confirm your eligibility with the research team before applying.

Is NCT06401421 currently recruiting?

Yes, NCT06401421 is actively recruiting participants. Contact the research team at industry.trials@nsabp.org for enrollment information.

Where is the NCT06401421 trial being conducted?

This trial is being conducted at Anchorage, United States, Palo Alto, United States, Torrance, United States, Vallejo, United States and 11 additional locations.

Who is sponsoring the NCT06401421 clinical trial?

NCT06401421 is sponsored by Exact Sciences Corporation. The trial plans to enroll 1,800 participants.

Related Trials

Related Intelligence Guides

In-depth guides covering this condition's trials, eligibility, and what to expect.

ClinicalMetric — Independent clinical trial intelligence platform. Not affiliated with NIH, ClinicalTrials.gov, the U.S. FDA, or any pharmaceutical company, hospital, or clinical research organization. Trial data is sourced from ClinicalTrials.gov for informational purposes only and does not constitute medical advice. Do not make any treatment, enrollment, or health decisions based solely on information found here — always consult a qualified healthcare professional. Full Disclaimer  ·  Last Reviewed: November 2026  ·  Data Methodology