The Who, What, Where, When and Sometimes, Why.

Breast Cancer Surgery

The goal of breast cancer surgery is to remove the entire tumor from the breast.

Some of the lymph nodes in the underarm area (axillary lymph nodes) may also be removed to see if they contain cancer.

Lumpectomy and mastectomy

There are 2 basic types of surgery to remove breast cancer:

Lumpectomy (also called breast-conserving surgery, partial mastectomy or wide excision). The surgeon removes the tumor and a small rim of normal tissue around it. The rest of the breast remains intact. How your breast looks after a lumpectomy depends on the amount of tissue removed.

Mastectomy. The surgeon removes the entire breast. In many cases, but not all, this includes the nipple and areola. Sometimes, breast reconstruction is done at the same time as a mastectomy.

Radiation therapy after surgery

Radiation therapy after lumpectomy

After surgery, most people who have a lumpectomy will have radiation therapy to the breast, and sometimes the underarm area. If your treatment plan also includes chemotherapy, radiation therapy is given after chemotherapy.

Radiation therapy after mastectomy

Some people who have a mastectomy may have radiation therapy to the chest and/or the underarm area. If your treatment plan also includes chemotherapy, radiation therapy is given after chemotherapy.

Learn more about radiation therapy.

Breast reconstruction can help restore the look of the breast after a mastectomy. It can be done at the same time as the mastectomy or later.

In rare cases, breast reconstruction or breast reduction may be done after a lumpectomy to help restore a more natural appearance of the breast, or to match the size and shape of the other breast.

Learn more about breast reconstruction.


Treatment guidelines

Although the exact treatment for breast cancer varies from person to person, guidelines help ensure high-quality care. These guidelines are based on the latest research and agreement among experts.

The National Comprehensive Cancer Network (NCCN) and the American Society of Clinical Oncology (ASCO) are respected organizations that regularly review and update their guidelines.

In addition, the National Cancer Institute (NCI) has treatment overviews.

Talk with your health care team about which treatment guidelines they use.

Deciding between lumpectomy and mastectomy

You may have a choice between a lumpectomy (plus radiation therapy) or a mastectomy.

If you have a choice, study your options. Weigh the risks and benefits of each surgery and choose the one that’s right for you. Survival is the same no matter which option you choose [2-3].

Surgery and drug therapies

The choice of surgery does not affect whether you will need chemotherapy, hormone therapy, HER2-targeted therapy and/or other drug therapies. Drug therapies are given based on the characteristics of the tumor, not the type of surgery you have.

For example, whether or not you will need hormone therapy depends on hormone receptor status. Hormone receptor status is a biomarker.

Learn more about deciding between a lumpectomy and a mastectomy.

You’re not alone

If you’re facing breast cancer surgery, remember, many people have been where you are today. They had the same fears and faced the same tough choices. They’ve gone through breast cancer treatment, recovered and are living their lives.

It may be helpful to talk with others who’ve finished treatment to help ease your fears.

Our Support section has a list of resources to help find local and online support groups. Your health care provider may also be able to help you find a support group.

Learn more about social support and support groups.


  • If you or a loved one needs more information about breast health or breast cancer, contact the Komen Breast Care Helpline at 1-877 GO KOMEN (1-877-465-6636) or email All calls are answered by a trained specialist or oncology social worker, Monday through Friday from 9:00 a.m. to 10:00 p.m. ET. Se habla español.
  • Komen Patient Navigators can help guide you through the health care system as you go through a breast cancer diagnosis. They can help to remove barriers to high-quality breast care. For example, they can help you with insurance, local resources, communication with health care providers and more. Call the Komen Breast Care Helpline at 1-877 GO KOMEN (1-877-465-6636) or email to learn more about our Patient Navigator program, including eligibility.
  • Komen Facebook groups provide a place where those with a connection to breast cancer can share their experiences and build strong relationships with each other. Visit Facebook and search for “Komen Breast Cancer group” or “Komen Metastatic Breast Cancer group” to request to join one of our closed groups.
  • Our fact sheets, booklets and other education materials offer additional information.

Surgery does not cause cancer to spread

Exposing breast cancer to air, removing some tumor tissue with a needle biopsy or cutting through the cancer during surgery does not cause it to spread.

For a short time after surgery, you will feel worse than you did before surgery. This is not because the breast cancer spread. Your body just needs time to recover from the surgery.

Sometimes, the surgeon finds more cancer during surgery than was seen on a mammogram or other imaging test, or more than was felt during a clinical breast exam. This doesn’t mean the breast cancer spread between the diagnosis and the surgery, or during surgery. The breast cancer was already there. It just didn’t show up on the imaging tests, or couldn’t be felt, so it wasn’t found until the surgery.


Before surgery

  • Will you do a sentinel node biopsy?
  • If my sentinel lymph node(s) contains cancer cells, will I need an axillary dissection? When and how will that decision be made?
  • Can I have a lumpectomy plus radiation therapy? If not, why not?
  • Would treatment before surgery improve my chances of having a lumpectomy?
  • If I get chemotherapy or another type of drug therapy before surgery, will I need more after surgery?
  • If I have a lumpectomy, when will I meet with the radiation oncologist to discuss radiation therapy?
  • How long will I be in the hospital after the surgery?
  • Will I need someone to help me when I return home from the hospital?
  • How should I expect to feel after the surgery?
  • What restrictions will I have on my activities after the surgery? For how long?
  • Where will the surgical scar(s) be?
  • Will I have any numbness after the surgery?
  • Will I have a surgical drain when I go home? If so, how will I care for it? When will it be removed?
  • What side effects might I expect after surgery? What problems should I report to you right away?
  • How does the removal of lymph nodes affect my chances of getting lymphedema? Does radiation therapy after surgery increase my chances of getting lymphedema?
  • What are the long-term side effects or health risks from surgery?
  • When should I return for follow-up? Do I need to bring someone with me?
  • Who will discuss the findings of my pathology report with me? Can I get a copy of the report for my records?
  • Will I need other treatments? If so, which one(s)? How long after surgery will I begin the other treatment(s)? 
  • Who will coordinate my care?
  • How does my surgery (a lumpectomy or a mastectomy) affect my risk of having a local breast cancer recurrence, metastasis or a new breast cancer? Please explain the differences to me.
  • Tell me about breast reconstruction. If I decide I want reconstruction, when can I have it (at the same time as the mastectomy or at a later date)? What are the risks? What about prosthesis options? Who else should I see to discuss and plan for reconstruction or prosthesis?
  • Will part of my tumor be saved? Where will it be stored? For how long? How can it be accessed in the future?
  • Who will talk with me about the cost of my treatment (including the expenses covered by my insurance and the costs I should expect to pay out-of-pocket)?

After surgery

  • If surgery was a lumpectomy: Were there cancer cells at my tumor margins? Do I need more surgery?
  • When will I be able to get back to my normal routine? When can I go back to work? (Ask about specific jobs or activities you do.)
  • Are there any precautions I should take? Are there activities I should avoid?
  • When can I start exercising again? Are there special exercises I should do? Are there any exercises I should avoid? Should I see a physical therapist or a lymphedema specialist?
  • What problems should I report to you right away?
  • Do I need to meet with a medical oncologist and a radiation oncologist? If not, why not? If yes, when?
  • If I would like to have a child after being treated for breast cancer, who should I talk to about my options?
  • Should I continue to see my regular physician or gynecologist during my treatment? Will you update them on my care and prognosis?
  • How often will I have check-ups and follow-up tests after treatment ends?
  • Will a follow-up care plan be prepared for me? Who will prepare the plan?
  • Which health care provider is in charge of my follow-up care?
  • Where can I find information about support groups?
  • Who will talk with me about the cost of my treatment (including the expenses covered by my insurance and the costs I should expect to pay out-of-pocket)?

Learn more about talking with your health care provider.

If you’ve been recently diagnosed with breast cancer or feel too overwhelmed to know where to begin to gather information, Susan G. Komen® has a Questions to Ask Your Doctor About Breast Surgery resource and a Questions to Ask Your Doctor About Breast Reconstruction resource that might help.

You can download, print and write on the resources at your next doctor’s appointment. Or you can download, type and save them on your computer, tablet or phone during a telehealth visit using an app such as Adobe. Plenty of space and a notes section are provided to jot down answers to the questions.

There are other Questions to Ask Your Doctor resources on many different breast cancer topics you may wish to download.


Updated 05/26/22