Breast cancer treatment can involve one approach or a combination of treatments depending on the cancer stage, hormone receptor status, HER2 status, tumor characteristics, and overall health. Common approaches include surgery, radiation therapy, chemotherapy, hormone therapy, targeted medicines, and immunotherapy. This guide explains how these options are used, what medication categories may be considered, and why biomarker testing can help guide treatment decisions. Treatment plans should always be discussed with a qualified cancer care team.
Breast cancer does not have one treatment that works for everyone. A cancer care team considers factors such as the tumor size, lymph node involvement, stage, hormone receptor status, HER2 status, genetic or biomarker findings, and overall health when developing a treatment plan. Some people receive local treatments such as surgery or radiation, while others may need systemic treatments that work throughout the body.
How Breast Cancer Treatment Is Chosen
Treatment decisions depend on the characteristics of the cancer and whether it is localized, locally advanced, recurrent, or metastatic. Testing for biomarkers can help identify treatments that may be appropriate for particular tumors.
Common factors considered include:
- Breast cancer stage and tumor size
- Whether nearby lymph nodes contain cancer
- Estrogen receptor and progesterone receptor status
- HER2 status
- Certain genetic or molecular changes
- Previous treatments and response
- Overall health and individual treatment considerations
Breast Cancer Treatment Options at a Glance
| Treatment option | How it may be used |
|---|---|
| Surgery | Removes the tumor or breast tissue containing cancer |
| Radiation therapy | Helps destroy remaining cancer cells in a treated area |
| Chemotherapy | Uses medicines that can destroy or slow fast growing cancer cells |
| Hormone therapy | Helps treat hormone receptor positive breast cancer |
| Targeted therapy | Targets specific features that help cancer cells grow |
| Immunotherapy | Helps the immune system recognize and fight certain breast cancers |
Most people with breast cancer receive a treatment plan involving one or more approaches rather than a single treatment.
How Surgery Is Used in Breast Cancer Treatment
Surgery is an important treatment for many people with breast cancer. The main surgical approaches include lumpectomy, which removes the tumor and some surrounding tissue, and mastectomy, which removes the breast. Lymph nodes may also be examined to determine whether cancer has spread beyond the breast.
Surgery may be followed by other treatments depending on the cancer characteristics and risk of recurrence.
Common surgical considerations include:
- Lumpectomy or breast conserving surgery
- Mastectomy
- Sentinel lymph node biopsy
- Other lymph node procedures when appropriate
- Breast reconstruction considerations
- Radiation or medication after surgery when recommended
How Radiation Therapy Works
Radiation therapy uses high energy radiation to damage cancer cells or prevent them from continuing to grow. For breast cancer, external beam radiation is commonly used, while internal radiation known as brachytherapy may be appropriate in selected situations.
Radiation may be considered after surgery to reduce the chance of cancer returning in the treated area. The treatment schedule depends on factors such as the cancer location, tumor characteristics, and treatment plan.
Possible effects can include:
- Skin changes in the treated area
- Fatigue
- Breast swelling or tenderness
- Other effects depending on the treatment area
What Medications May Be Used
Systemic medicines can reach cancer cells throughout the body. The medication category selected depends strongly on the type of breast cancer.
Hormone Therapy
Hormone therapy may be used when breast cancer cells have hormone receptors. Medicines can reduce hormone activity or block hormone receptors that may help cancer cells grow.
Examples of hormone therapy include:
- Tamoxifen
- Aromatase inhibitors such as anastrozole, letrozole, and exemestane
- Fulvestrant
- Other endocrine medicines for selected advanced cancers
Some hormone receptor positive cancers may also be treated with additional targeted medicines.
Targeted Therapy
Targeted medicines are designed to act on specific characteristics of cancer cells. HER2 targeted medicines, for example, may be used when testing shows HER2 positive disease.
Other targeted approaches can involve pathways such as CDK4/6, PI3K, AKT, or other molecular features. The appropriate medicine depends on the cancer subtype, stage, previous treatment, and biomarker results.
Chemotherapy
Chemotherapy uses medicines that kill or slow the growth of cancer cells. It may be used before surgery, after surgery, or for advanced breast cancer depending on the circumstances.
Examples of chemotherapy medicines used in breast cancer include:
- Paclitaxel
- Docetaxel
- Carboplatin
- Cisplatin
- Gemcitabine
- Capecitabine
- Eribulin
Chemotherapy can cause side effects such as fatigue, nausea, mouth sores, and hair loss, although the effects vary by medicine and individual.
Immunotherapy
Immunotherapy helps the immune system fight cancer. It may be used for certain people with triple negative breast cancer, including situations where biomarker testing supports its use. Pembrolizumab is an immunotherapy medicine used in breast cancer treatment.
Immunotherapy can cause effects such as fatigue, rash, or diarrhea. Some immune related side effects can affect organs and require prompt medical attention.
Why Biomarker Testing Matters
Biomarker testing can provide important information about the cancer. Tests may identify hormone receptors, HER2 status, or particular genetic changes that can influence treatment choices.
For example, some newer treatments are approved only for specific molecular or receptor characteristics. In 2026, the FDA approved additional treatments for selected advanced breast cancers based on characteristics such as ESR1 mutations, HER2 status, PD-L1 expression, and other tumor features.
This is one reason treatment decisions should be individualized rather than based only on the general type of breast cancer.
How to Prepare for Treatment Discussions
Understanding the diagnosis can make conversations with a cancer care team easier. Helpful questions may include:
- What type and stage of breast cancer is present?
- What are the hormone receptor results?
- What is the HER2 result?
- Are additional biomarker tests appropriate?
- Is surgery recommended?
- Could radiation therapy be part of treatment?
- Which medication categories may be considered?
- What side effects should be monitored?
- How will treatment response be evaluated?
- Are clinical trials appropriate?
Keep copies of pathology reports, imaging results, medication lists, and treatment information when possible. A second medical opinion may also be considered when someone wants additional information before making a major treatment decision.
Conclusion
Breast cancer treatment can involve surgery, radiation therapy, chemotherapy, hormone therapy, targeted therapy, immunotherapy, or combinations of these approaches. The most appropriate plan depends on the cancer stage, receptor and biomarker results, previous treatments, and individual circumstances. Because treatment options and approved medicines continue to change, reliable information from organizations such as the National Cancer Institute and the FDA can help patients understand their choices. This article is for general education only and does not replace advice from a qualified healthcare professional.