How Breast Cancer Treatment Is Decided

No two breast cancer cases are identical. Treatment plans are tailored based on several key factors: the type and stage of cancer, the tumor's hormone receptor and HER2 status, the patient's overall health, age, and personal preferences. Understanding the available options empowers patients to have meaningful conversations with their medical team.

Surgery

Surgery is often the first step in treating breast cancer. The two main surgical approaches are:

  • Lumpectomy (breast-conserving surgery): The tumor and a small margin of surrounding healthy tissue are removed, while the rest of the breast is preserved. This is typically followed by radiation therapy.
  • Mastectomy: Removal of the entire breast. Options include total mastectomy, skin-sparing mastectomy, and nipple-sparing mastectomy. Reconstruction surgery may be performed at the same time or at a later stage.

In many cases, lymph nodes in the underarm area (axillary lymph nodes) are also removed and tested to determine if cancer has spread.

Radiation Therapy

Radiation therapy uses high-energy rays to destroy remaining cancer cells after surgery. It is commonly recommended after lumpectomy to reduce the risk of local recurrence. Types include:

  • External beam radiation: The most common type, delivered by a machine outside the body over several weeks.
  • Brachytherapy (internal radiation): Radioactive material is placed directly inside the breast near the tumor site.
  • Accelerated partial breast irradiation: A shorter course of radiation targeting only the area where the tumor was removed.

Chemotherapy

Chemotherapy uses drugs to destroy rapidly dividing cancer cells throughout the body. It may be given:

  • Before surgery (neoadjuvant chemotherapy): To shrink a tumor and make surgery easier, or to test how the cancer responds to treatment.
  • After surgery (adjuvant chemotherapy): To reduce the risk of the cancer returning by targeting any remaining cells.

Common side effects include fatigue, nausea, hair loss, and increased infection risk, though management strategies have improved significantly.

Hormone Therapy (Endocrine Therapy)

For cancers that are estrogen receptor-positive (ER+) or progesterone receptor-positive (PR+), hormone therapy reduces the stimulation cancer cells receive from these hormones. Common medications include:

  • Tamoxifen: Often used in premenopausal women; blocks estrogen receptors in breast tissue.
  • Aromatase inhibitors (e.g., anastrozole, letrozole): Used primarily in postmenopausal women; reduce estrogen production in the body.
  • Ovarian suppression: For premenopausal women, medications or surgery may be used to reduce estrogen produced by the ovaries.

Hormone therapy is typically taken for 5–10 years and significantly reduces recurrence risk in hormone-sensitive cancers.

Targeted Therapy

Targeted therapies attack specific characteristics of cancer cells, causing less damage to healthy tissue than traditional chemotherapy. Key examples include:

  • HER2-targeted drugs (e.g., trastuzumab/Herceptin): For HER2-positive breast cancers, these drugs block the HER2 protein that drives tumor growth.
  • CDK4/6 inhibitors (e.g., palbociclib): Used for hormone receptor-positive, HER2-negative advanced breast cancer.
  • PARP inhibitors: For patients with BRCA gene mutations and certain advanced cancers.

Immunotherapy

Immunotherapy helps the body's own immune system recognize and attack cancer cells. It has shown promise particularly for triple-negative breast cancer (TNBC), a subtype that does not respond to hormone therapy or HER2-targeted drugs.

Palliative and Supportive Care

For advanced or metastatic breast cancer, the focus may shift toward managing symptoms and maintaining quality of life. Palliative care is not the same as end-of-life care — it is specialized medical support that can be provided alongside active treatment at any stage.

The Importance of a Multidisciplinary Team

Breast cancer treatment typically involves a team of specialists including a surgeon, medical oncologist, radiation oncologist, pathologist, and breast care nurse. A multidisciplinary team meeting ensures that all perspectives are considered when designing a treatment plan. Always feel empowered to ask questions and, if appropriate, seek a second opinion.