Could a Post-Workout protein shake help breast cancer survivors rebuild muscle?
NCT ID NCT07704476
First seen Jul 15, 2026 · Last updated Jul 16, 2026 · Updated 1 time
Summary
This study tests whether taking a high dose of whey protein after each workout helps breast cancer survivors gain more muscle and lose more fat compared to exercise alone. Participants are women aged 20 to 89 who have completed treatment for breast cancer and are prescribed exercise as part of standard care. The trial compares a group that consumes 60 grams of whey protein after exercise with a group that consumes no protein, measuring changes in muscle mass, fat mass, and resting metabolic rate.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- whey protein (60 grams)
- What this could lead to
- If it works, this could point toward a simple dietary strategy to help breast cancer survivors build muscle and reduce body fat during exercise recovery.
- What could go wrong
- This is a small, early-stage study with only 40 participants, so results may not apply broadly. The high protein dose may cause digestive discomfort or be hard to tolerate.
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
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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About 40 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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Jun 2026
An estimate. Start dates often move.
- Expected to finish
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Jun 2027
An estimate. End dates often move.
- Lead sponsor
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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
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20 to 89 years
- Sex
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Female participants only
- Healthy volunteers
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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 Hide 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. Age 20-89 years 2. Women prescribed exercise as a SOC 3. Women with a biopsy proven diagnosis of ductal carcinoma in situ (DCIS) or invasive carcinoma of the breast 4. Women must have undergone treatment for breast cancer, including one or more of the following: surgery, radiation therapy, chemotherapy, immunotherapy, or hormonal therapy. Women undergoing active chemotherapy are not allowed on study. Immunotherapy or targeted agent usage is allowed. 5. Women with \> 3 months of resistance training experience under expert guidance by a CSCS 6. Must be able to read and understand English and consent for themselves. Exclusion Criteria: 1. Any current treatment with cytotoxic chemotherapy for breast cancer 2. Inability to safely engage in group sessions of resistance training as deemed by study PI 3. Severe arthritic, joint, cardiovascular, or musculoskeletal condition deemed by PI to be unsafe to engage in resistance training 4. Beta blocker or GLP-1 inhibitor medications 5. Pregnant women 6. Males 7. Lactose intolerance 8. Cow's milk or whey protein allergy
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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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
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AHN Allegheny General Hospital
Pittsburgh, Pennsylvania, 15212, United States
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