A Study on Combined Low-pass Whole-genome and Methylome Testing of Bloody Nipple Discharge Specimens for Benign-Malignant Differentiation.

Hubei Cancer Hospital

Status: Not yet enrolling

Conditions: Nipple Discharge; Breast Cancer

Study type: Observational

Funder types: Other

Identifiers

NCT07250204

LLHBCH2025YN-072

Details and patient eligibility

About

This is a prospective, single-center diagnostic study testing whether a new, minimally invasive analysis of nipple fluid can distinguish benign from malignant causes of pathologic nipple discharge. Many patients with bloody or blood-tinged nipple discharge undergo surgery to make a diagnosis, yet most are ultimately found to have benign disease. The investigators aim to develop a laboratory test that analyzes DNA in nipple fluid to help avoid unnecessary operations while still identifying cancers.

Approximately 30 adults with spontaneous, single-duct, unilateral bloody or serosanguinous nipple discharge who are already scheduled for standard diagnostic surgery will be enrolled at Hubei Cancer Hospital. Before surgery, the investigators will collect a small sample of nipple fluid (or gently obtain nipple aspirate fluid using a soft suction cup if needed) and one tube of blood. The investigators will analyze the fluid's DNA using two approaches: low-pass whole-genome analysis to look for copy number changes and fragmentation patterns, and genome-wide DNA methylation profiling. Surgical pathology will serve as the reference standard. Using these data, the investigators will build and validate a model to classify lesions as benign or malignant.

The primary outcome is diagnostic accuracy (area under the ROC curve, sensitivity, and specificity). Secondary outcomes include positive and negative predictive values, model calibration, subgroup performance (e.g., ductal carcinoma in situ vs invasive cancer), and an estimate of potential clinical impact (for example, how many benign cases might safely avoid surgery at a high-sensitivity threshold). Study test results will not affect current clinical care; all participants will receive usual evaluation and surgery. Risks are minimal and may include brief nipple discomfort or skin irritation from gentle suction and routine blood-draw risks (bruising, lightheadedness). There is no direct benefit to participants, but the findings may support a future noninvasive test to guide care and reduce unnecessary surgery. Data will be de-identified and stored securely. Expected enrollment is from September 2025 to May 2026.

Enrollment: 60 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. Age ≥18 years.
2. Spontaneous, unilateral, single-duct pathologic nipple discharge, predominantly bloody or serosanguinous, raising clinical suspicion of intraductal disease.
3. Planned diagnostic breast surgery/biopsy after specialist assessment (e.g., duct excision/microdochectomy, lumpectomy); patients who had ductoscopy but are still scheduled for surgery remain eligible.
4. Study sampling (nipple discharge and one peripheral blood tube) feasible before surgery/invasive diagnostics without delaying standard care.
5. Able and willing to provide written informed consent and allow access to surgical pathology and relevant clinical data.

Exclusion criteria

1. Physiologic or non-pathologic discharge (typically bilateral, multiduct, expressible only with manipulation; milky/clear/green) or galactorrhea due to endocrine/drug causes.
2. Active breast infection/inflammatory disease (e.g., abscess) as the source of discharge.
3. Prior diagnosis and treatment of breast cancer (surgery/radiation/systemic therapy).
4. Recent invasive ductal manipulation likely to confound analysis (e.g., ductoscopy, duct cannulation/irrigation), per investigator judgment.
5. Pregnant or lactating patients.
6. Significant hematologic disease/coagulopathy precluding safe sampling.
7. Inability to complete preoperative study sampling, refusal/withdrawal of consent, or poor compliance.
8. Any condition judged by investigators to compromise sample quality, data interpretation, or participant safety.

Trial design

60 participants in 2 patient groups

Malignant Cohort - Pathologic Nipple Discharge (DCIS/IDC)

Description:

Adults (≥18 years) with unilateral, spontaneous, single-duct pathologic nipple discharge who undergo clinically indicated diagnostic surgery. Group assignment is based on postoperative breast pathology confirming malignant disease (e.g., ductal carcinoma in situ or invasive ductal carcinoma). Preoperative nipple discharge is collected for low-coverage whole-genome sequencing (fragmentomics/CNV) and genome-wide DNA methylation profiling. Usual care only; research testing does not alter management. Followed through surgery and receipt of final pathology; no protocol-mandated long-term follow-up.

Benign Cohort - Pathologic Nipple Discharge (Papilloma/Duct Ectasia)

Description:

Adults (≥18 years) with unilateral, spontaneous, single-duct pathologic nipple discharge who undergo clinically indicated diagnostic surgery. Group assignment is based on postoperative breast pathology confirming benign disease (e.g., intraductal papilloma, duct ectasia, other benign lesions). Preoperative nipple discharge is collected for low-coverage whole-genome sequencing (fragmentomics/CNV) and genome-wide DNA methylation profiling. Usual care only; research testing does not alter management. Followed through surgery and receipt of final pathology; no protocol-mandated long-term follow-up.