Do You Need a Mastectomy? What to Know About Lumpectomy and Breast-Conserving Surgery

A breast cancer diagnosis can make surgery sound like an all-or-nothing choice: remove the tumor, or remove the breast.

For many people with early-stage breast cancer, that isn’t the case.

Breast-conserving surgery, commonly called a lumpectomy, removes the cancer along with some surrounding tissue while leaving most of the breast in place. For appropriately selected patients, lumpectomy followed by radiation can provide the same long-term survival as mastectomy.

But that doesn’t mean the two surgeries are interchangeable for everyone. The cancer’s size and location, whether there is more than one area of cancer, previous treatment, the patient’s ability to receive radiation and other factors can affect which options are available.

What is breast-conserving surgery?

During a lumpectomy, the surgeon removes the tumor and some normal tissue around it. The rest of the breast remains.

You may also hear terms such as partial mastectomy or wide local excision. They generally describe breast-conserving approaches.

The goal is to remove the known cancer while preserving as much of the breast as safely possible. For some tumors that cannot be felt, the surgical team may use imaging and a localization device to help find the area that needs to be removed.

Is a lumpectomy as effective as a mastectomy?

For many people with early-stage breast cancer who are candidates for both approaches, yes.

Research spanning decades has found that breast-conserving surgery followed by radiation provides long-term survival comparable to mastectomy. The American Cancer Society and National Cancer Institute both continue to describe the two approaches as having equivalent survival for appropriately selected early-stage patients.

That does not mean the treatments are identical.

With a lumpectomy, most of the breast remains, but radiation is usually part of the treatment. A mastectomy removes the entire breast and may require reconstruction, while radiation may or may not be needed depending on the cancer.

Who can have a lumpectomy?

There is no single tumor-size cutoff that determines whether someone can have breast-conserving surgery.

Doctors consider factors including:

• The size and location of the tumor
• The size of the breast relative to the tumor
• Whether cancer is found in more than one area
• Whether the cancer can be removed with an appropriate margin
• Previous radiation treatment
• The type and extent of the cancer

Some situations make mastectomy more appropriate or necessary. For example, inflammatory breast cancer generally cannot be treated with breast-conserving surgery, while extensive disease involving multiple areas of the breast may also affect the choice.

Why is radiation usually part of a lumpectomy?

Surgery removes the tumor that doctors can identify. Radiation is used afterward to treat remaining microscopic cancer cells in the breast and reduce the chance that the cancer returns there.

Most people who have a lumpectomy receive radiation after they heal from surgery, although some carefully selected patients may be able to safely omit it. The appropriate treatment depends on the individual’s cancer and circumstances.

Radiation schedules can also vary, so the older idea that every patient needs several weeks of daily treatment should not be treated as a universal rule.

What does “clear margins” mean?

After surgery, a pathologist examines the tissue that was removed.

A negative or clear margin means cancer is not present at the edge of the removed tissue. If cancer reaches the edge, the margin is considered positive, and additional surgery may be recommended.

A close margin is not automatically the same as a positive margin. Current breast-surgery guidance distinguishes between the two and considers the type of cancer and treatment plan when deciding whether more tissue needs to be removed.

Will lymph nodes be checked?

Sometimes.

Breast cancer surgery may include a sentinel lymph node biopsy, which checks nearby lymph nodes for signs that cancer has spread beyond the breast. Whether this is needed depends on the type and circumstances of the cancer.

What happens after surgery?

Surgery is only one part of breast cancer treatment.

Depending on the cancer’s stage and biological characteristics, treatment after surgery may include radiation, hormone therapy, chemotherapy, targeted therapy or other treatments.

A lumpectomy can also change the breast’s shape or appearance. Some people have a visible scar, indentation, swelling or changes in sensation. Oncoplastic surgery uses plastic-surgery techniques during cancer removal to help preserve or reshape the breast in appropriate cases.

Questions to ask your cancer team

If you’re deciding between lumpectomy and mastectomy, consider asking:

• Am I a candidate for breast-conserving surgery?
• How large is the tumor compared with my breast?
• Is there more than one area of cancer?
• Will I need radiation?
• Will my lymph nodes need to be checked?
• What are the chances I will need another surgery?
• How might surgery change the appearance or feeling of my breast?
• Could oncoplastic surgery be an option?
• What other treatment might I need afterward?
• Would a second opinion be useful?

The evidence shows that, for appropriately selected patients with early-stage breast cancer, breast-conserving surgery followed by radiation can provide survival comparable to mastectomy.

It does not show that every person with breast cancer can have a lumpectomy, that every patient needs radiation, or that one surgical approach is right for everyone.

The decision depends on the cancer, the available treatment options and what matters to the person receiving care. The goal is not simply to choose between two operations. It is to understand the evidence and make an informed decision with your breast cancer team.