The short answer
MammaPrint Score is a report or oncology term that needs context from the full diagnosis, test method, symptoms, and treatment goal.
What Does MammaPrint Score Mean? is a planning topic, not a diagnosis or treatment instruction by itself.
The next step depends on diagnosis, symptoms, goals, prior results, and what is still pending.
Use the page to prepare specific questions for a clinician who can review the full record.
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The short answer
MammaPrint is a genomic test used in some breast cancers. It looks at a set of 70 genes in a sample of the tumor. Based on those genes, it sorts the cancer into one of two groups. That means low risk, or high risk, of the cancer spreading to distant parts of the body in the years after treatment. Doctors use it to estimate risk. That helps inform the chemotherapy conversation.
Where you may see it
You may see a MammaPrint result in breast cancer treatment planning notes. Ask your care team whether your tumor is a candidate for this kind of testing.
What the result actually means
A large trial, called MINDACT, tested how useful this result is. It looked at cases where the genomic result disagreed with a doctor's clinical judgment. Clinical risk means risk based on standard details like tumor size and lymph nodes. Some people had higher clinical risk, but a low-risk MammaPrint result. For them, skipping chemotherapy still led to strong outcomes: 94.7% were alive without distant metastases at five years. NCI says the trial was not large enough to prove that skipping chemotherapy is as good for this group. Other people had low clinical risk, but a high-risk MammaPrint result. For them, NCI says chemotherapy gave minimal benefit. Five-year outcomes were nearly the same with or without it. Ask your team what this means for you.
What it can tell your team
A MammaPrint result helps frame the chemotherapy conversation. It works alongside the standard details in your pathology report. That includes tumor size, grade, hormone receptor status, HER2 status, and lymph node involvement. It does not replace these details. Your oncologist weighs all of them together, not the genomic result alone.
What it cannot tell by itself
A low-risk result does not mean zero risk. It means your estimated chance of distant recurrence is low. Its evidence comes from specific patient groups, so it may not apply to every breast cancer. Ask your team whether it changes any other part of your plan.
Is this urgent?
A MammaPrint result is not an emergency by itself. Ask your oncologist when decisions will be made. Call your care team right away about severe or fast-changing symptoms.
Questions to ask
- Was my result low risk or high risk?
- How does that compare with my clinical risk factors?
- How does this result change, or not change, the chemotherapy recommendation in my case?
- Do my tumor type and stage match the group MINDACT studied?
- What other biomarker results are being weighed alongside this one?
Sources
Common questions
Does this page tell me what treatment to choose?
No. It explains the topic in plain language so you can ask better questions. Your care team applies it to your diagnosis, test results, and goals.
What should I bring to the visit?
Bring the report, medicine list, recent test results, and a written list of questions. Ask what result or decision is still pending.
When is this more urgent?
Use the urgent instructions from your care team for severe, fast-changing, or treatment-specific warning symptoms.
Questions to ask your doctor
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Your next step
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Sources last checked: 2026-10-02 what this meansLast updated: 2026-08-05Next planned review: 2027-07-21
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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