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Could your gut bacteria predict implant infections after breast cancer surgery?

NCT ID NCT05020574

Knowledge-focused Sponsor: University of California, San Francisco Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looks at how antibiotics change the bacteria in the gut and breast tissue after mastectomy with implant reconstruction. Researchers will collect samples from 200 women to see if certain bacteria are linked to infections. The goal is to better understand infection risks, not to test a new treatment.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Cephalexin (Keflex)
What this could lead to
If successful, this could help doctors predict and prevent implant infections after mastectomy by understanding the role of bacteria.
What could go wrong
This is an early-stage study focused on feasibility, not treatment. It may not lead to changes in care, and results may not apply to all patients.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 2

Tests whether the treatment actually works, and watches for side effects, in a larger group.

Participants

About 200 people

The number the study aims to enrol. It can still change while the study runs.

Started

Sep 2021

Expected to finish

Dec 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Female participants only

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Patients must have histologically confirmed breast malignancy OR genetic predisposition to breast cancer. 2. Age \>= 18 years 3. Scheduled to undergo mastectomy with the immediate placement of tissue expanders or implant placement 4. Ability to understand a written informed consent document, and the willingness to sign it 5. At least 4 weeks post-completion of chemotherapy or radiation therapy. Exclusion Criteria: 1. Any significant medical condition or laboratory abnormalities, which places the subject at unacceptable risk if he/she were to participate in the study 2. Pregnant or breastfeeding 3. Patients who have taken antibiotics within 90 days of the consent date 4. Patients who have taken probiotics within 90 days of the consent date 5. Patients who have a documented or reported allergic reaction to the outlined antibiotics to be used in this study 6. Male patients

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Conditions

The condition(s) this trial relates to.

breast cancer breast neoplasm female breast carcinoma inherited disease susceptibility

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Breast cancer Breast cancer female Genetic predisposition to disease

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The study's own enquiry address

    This study publishes an address for enquiries. See it below .

  2. The places running it

    1 site. The list below names each one and where it is.

  3. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  4. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • University of California, San Francisco

    RECRUITING

    San Francisco, California, 94143, United States

    Contact Email: •••••@•••••

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