Could a vaccine stop breast cancer before it starts? new trial launches
NCT ID NCT06218303
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This early-stage trial is testing whether a vaccine targeting the MUC1 protein, combined with hormone therapy, can help prevent ductal carcinoma in situ (DCIS) from becoming invasive breast cancer. Fifty women with ER-positive DCIS will receive either hormone therapy alone or hormone therapy plus the vaccine before surgery. The main goal is to see if the vaccine boosts the immune system's response against cancer cells.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- MUC1 peptide vaccine combined with Hiltonol® (an immune booster) and hormone therapy (aromatase inhibitor or SERM)
- What this could lead to
- If it works, this could lead to a vaccine that prevents ductal carcinoma in situ from progressing to invasive breast cancer, reducing the need for surgery.
- What could go wrong
- This is a very early phase 1 trial with only 50 participants, so it is too small to prove effectiveness. The vaccine may not trigger a strong enough immune response, and side effects are unknown.
This is an AI summary of the original study and may miss details. Read our disclaimer.
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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.
Contacts and locations
Locations
-
UPMC Magee Womens Hospital
RECRUITINGPittsburgh, Pennsylvania, 15213, United States
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