The short answer
Breast cancer treatment usually combines approaches. Surgery removes the tumor, radiation targets remaining cancer cells, and chemotherapy, hormone therapy, or targeted therapy treat the whole body. The plan depends on the type, stage, and markers of the cancer.
Most people receive a combination of treatments chosen for their specific cancer.
Surgery may remove the tumor (lumpectomy) or the whole breast (mastectomy).
Radiation therapy may be part of your treatment; your team will say if you need it.
Hormone therapy treats hormone-receptor-positive cancers; targeted therapy treats HER2-positive cancers.
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This page is for people newly diagnosed with breast cancer, and their families. It explains the main treatments and how a team fits them together.
Why breast cancer treatment is not one-size-fits-all
Breast cancer treatment depends on more than stage alone. It depends on the tumor's molecular subtype. Some tumors use estrogen or progesterone as fuel. Some make too much of a protein called HER2. Some have none of these features — doctors call that triple-negative. Two people can have the same size tumor and still get very different treatment plans. Their tumors run on different biology.
Surgery: the starting point for most people
Surgery is one of the main treatments for breast cancer. There are two main types:
- A lumpectomy, also called breast-conserving surgery, removes the tumor and a margin of normal tissue. It keeps the rest of the breast.
- A mastectomy removes the entire breast.
Your team may also check nearby lymph nodes. Ask what that would involve.
Which option is right depends on your cancer and your own preference. Ask your team how each option would work for you.
Radiation
NCI says you may receive radiation therapy as part of your breast cancer treatment. Your team can explain whether you need it and when.
Hormone therapy: for tumors fueled by estrogen or progesterone
Many breast cancers have receptors for estrogen, progesterone, or both. NCI says hormone therapy helps lower the risk of recurrence of certain types of breast cancer. It only works for hormone-receptor-positive cancers. Ask your team which drug, if any, is right for you and for how long.
Targeted therapy: for HER2-positive cancers
Some breast cancers make too much of a protein called HER2. This protein can drive faster growth. Targeted therapy uses drugs that attack specific features of cancer cells, such as HER2. Ask your team whether your tumor has a target like this.
Chemotherapy and immunotherapy
NCI notes that not everyone with breast cancer will get chemotherapy. Triple-negative breast cancer lacks estrogen, progesterone, and HER2 receptors. NCI says immunotherapy may be used to treat triple-negative breast cancer. Immunotherapy helps your immune system recognize and attack cancer cells.
How it all comes together
NCI says you and your cancer care team will work together to decide your treatment plan, which may include more than one type of treatment. Your team weighs the tumor's stage, its subtype, and your own health and goals. Ask why your team chose the order of treatments it did.
What to ask your team
- What is my tumor's subtype — hormone receptor status and HER2 status — and how does that shape my treatment?
- Would a lumpectomy or mastectomy be more appropriate for my situation?
- Will I have chemotherapy or other drug treatment before surgery, after it, or both?
- What side effects should I expect from each part of my plan?
- Is a clinical trial a reasonable option for me?
Sources
Common questions
What are the main treatments?
The main treatments are surgery, radiation therapy, chemotherapy, hormone therapy, and targeted therapy. Most people receive a combination chosen for their cancer's type, stage, and markers.
What surgery options are there?
Surgery may be a lumpectomy, which removes the tumor and a margin of tissue, or a mastectomy, which removes the whole breast. Nearby lymph nodes may also be checked or removed.
When is radiation used?
Radiation therapy uses high-energy rays to kill cancer cells. NCI says you may receive it as part of your treatment. Your team will tell you whether you need it.
What is hormone therapy?
Hormone therapy is used for hormone-receptor-positive cancers. NCI says it helps lower the risk that certain types of breast cancer come back. Ask your team how long you would take it.
What is targeted therapy?
Targeted therapy uses drugs that attack specific features of cancer cells, such as HER2. It is used for cancers that have those targets, often along with chemotherapy.
Questions to ask your doctor
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Last updated: 2026-10-16Next planned review: 2027-07-07
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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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