Breast Conservation Surgery vs Mastectomy: How to Decide

Breast conservation surgery vs mastectomy is decided by one question: can the conserved breast safely receive radiotherapy? Dr. Rajesh Kumar Jain, Principal Director - Surgical Oncology, BLK-Max Super Speciality Hospital, New Delhi, India, conserves the breast whenever it can be done well, and chooses mastectomy for multicentric disease, a breast too small to conserve, or any situation in which radiotherapy cannot be given.

Breast conservation surgery (BCS) removes the tumour with a rim of normal tissue, an operation also called a wide local excision or lumpectomy, and leaves the rest of the breast in place. Mastectomy removes the whole breast. Either operation is paired with a decision about the axillary lymph nodes and, increasingly, about reconstruction. Dr. Jain wanted these choices "crystal clear" to the doctors he was teaching, and this article follows his reasoning through each of them. Diagnosis and staging, which come first, are covered in the complete guide to breast cancer diagnosis and surgery and in staging breast cancer without PET-CT.

Breast conservation surgery vs mastectomy: radiotherapy decides

Radiotherapy decides, because postoperative radiotherapy is mandatory after breast conservation. A wide excision on its own does not give adequate local control; the remaining breast must be irradiated. Any patient who cannot receive radiotherapy is therefore not a candidate for conservation, however small her tumour.

For a suitable patient, conservation is the preferred operation. Asked by a doctor in the session about a young unmarried woman with a well-localised, mobile ductal carcinoma in one breast, Dr. Jain's answer was direct: this is early breast cancer in a young patient, and she should have breast conservation surgery, not a mastectomy. The plan he described was a wide excision with sentinel lymph node biopsy, or at least an axillary dissection where sentinel biopsy is not available, followed by full pathology. If the tumour is hormone-receptor positive, tamoxifen can then be started, and chemotherapy added if the pathology indicates it. Starting tamoxifen before surgery, he said, is not a good idea.

When mastectomy is the better choice

Mastectomy is the better choice in five situations, which Dr. Jain set out as the contraindications to breast conservation.

1. Multicentric disease. Cancer located in more than one quadrant of the breast, for example in both the upper outer and the upper inner quadrant, is better treated by mastectomy. This is why MRI is mandatory before conservation when multiple lesions or diffuse microcalcification are seen on mammography.
2. A breast too small to conserve. If the breast is small, the tissue left after a wide excision is so little that conservation becomes meaningless, and mastectomy is the better operation.
3. Pregnancy, particularly in the first trimester. Radiotherapy cannot be given during pregnancy, so conservation, which depends on radiotherapy, is not suitable.
4. Severe systemic lupus erythematosus (SLE) or a similar condition that makes radiotherapy unsafe.
5. No access to radiotherapy. Where a radiotherapy facility is not available, conservation cannot be completed safely and mastectomy is the better course.

The common thread in the last three is the same: if radiotherapy cannot be given, the breast should not be conserved.

How wide should the margin be in breast conservation surgery?

Dr. Jain aims for a margin of at least 1 cm of normal tissue around a wide excision, in all three dimensions: superior, inferior, medial, lateral, deep, and the overlying skin. He acknowledged that some surgeons consider 5 mm sufficient, but his personal standard is 1 cm all round, which he regards as the best way to secure good local control. For invasive cancer treated with conservation and whole-breast radiotherapy, current consensus guidelines accept a margin with no tumour cells at the inked edge of the specimen, so practice on margin width varies between surgeons.

BRCA testing before bilateral mastectomy: who needs it

A woman with familial breast cancer should have BRCA testing before any decision to remove both breasts. That was Dr. Jain's answer when a doctor in the live discussion asked whether such a woman should simply have a bilateral mastectomy: the decision rests on a genetic test. BRCA1 and BRCA2 are genes whose inherited mutations sharply raise the risk of breast cancer, and testing for them is indicated in three groups:

• every patient with triple-negative breast cancer;
• a strong family history in close relatives, such as a sister, two sisters, a mother, or a maternal or paternal aunt with breast cancer;
• any history of male breast cancer in the family. A single case of male breast cancer, he stressed, places the family at high risk.

If the BRCA test is positive, Dr. Jain's recommendation is a mastectomy of the affected breast with a prophylactic mastectomy of the opposite breast: a bilateral mastectomy. Risk-reducing surgery of the healthy breast is a decision made with the patient, ideally after genetic counselling. Where BRCA testing is not available locally, it can be carried out in New Delhi.

Sentinel node biopsy or axillary dissection: managing the axilla

Where the surgeon is trained, Dr. Jain considers sentinel lymph node biopsy the better choice for a clinically node-negative axilla; otherwise a complete axillary dissection is done. The axillary lymph nodes are staged and treated at the same operation as the breast. When the nodes are not palpable and not seen on imaging (clinically node-negative, N0), the surgeon has two options: sentinel lymph node biopsy or axillary dissection, depending on the training and facilities available.

How sentinel lymph node biopsy works

The sentinel nodes are the first nodes to receive lymph from the tumour, so they are the first place cancer is likely to spread. They are identified with one of three tracers:

• Blue dye, such as methylene blue. Two or three blue-stained nodes are found in the axilla and removed.
• Indocyanine green (ICG). A fluorescence camera shows two to four glowing nodes in the axilla, which are removed.
• A radiopharmaceutical. A handheld gamma probe detects the signal from the radioactive nodes, which are localised and removed.

The sentinel nodes, usually three or four, normally lie in level I of the axilla.

The frozen section decides the extent of surgery

The sentinel nodes are sent for frozen section, a rapid pathological examination during the operation. If they are negative, a complete axillary dissection is avoided. If one or two nodes are positive, Dr. Jain proceeds to a complete axillary lymph node dissection. Large trials have since shown that some women with one or two positive sentinel nodes who are having breast conservation and whole-breast radiotherapy can safely be spared a full dissection, so this step is tailored to the individual patient.

For surgeons who have not trained in sentinel node biopsy, Dr. Jain offers to teach the technique at BLK-Max so that it can be performed at their own hospitals. Where training or facilities are not available, a complete axillary dissection is the correct operation.

The three levels of axillary dissection

The axillary nodes are described in relation to the pectoralis minor muscle. Level I nodes lie below and lateral to it, level II nodes lie behind it, and level III, or apical, nodes lie above and medial to it. A level I and II dissection is generally the optimum. If the nodes are large and the surgeon is not comfortable, the dissection can be extended to level III.

Whenever he does not perform a sentinel node biopsy, Dr. Jain's own practice is a complete level I, II and III dissection. He can do so without concern about lymphoedema, the chronic arm swelling that follows axillary surgery, because of a technique he adds to every axillary dissection.

LYMPHA technique: preventing lymphoedema after axillary dissection

LYMPHA (Lymphatic Microsurgical Preventive Healing Approach) is a microsurgical procedure, performed at the same time as the axillary dissection, that reconnects the arm's lymphatic drainage to a vein to prevent lymphoedema. Dr. Jain described the steps:

1. A blue dye is injected into the arm to identify a lymphatic channel draining the arm.
2. A tributary of the axillary vein, the most lateral one available, is identified.
3. Under the operating microscope, the lymphatic is joined to the vein tributary in a lymphovenous anastomosis.

The anastomosis creates a channel through which lymph from the arm drains into the axillary vein, bypassing the nodes that have been removed. It adds around 20 minutes to a standard axillary clearance.

In Dr. Jain's experience, the benefits are seen early and late. Less seroma (fluid collection) forms, the surgical drain comes out sooner, the patient can exercise the arm well, and complications such as lymphangitis, lymphoedema and arm swelling do not occur, even after complete dissection and axillary radiotherapy. Published series show that LYMPHA substantially reduces the risk of lymphoedema, although it does not remove it entirely in every patient.

Breast reconstruction after mastectomy: timing and options

Reconstruction can be immediate or delayed, and uses a flap of the patient's own tissue, an implant, or both. Dr. Jain's view is that reconstruction should be offered, because patients who have it are psychologically much better after surgery; they do not feel they have lost their breast.

Immediate or delayed reconstruction

Reconstruction can be done at the same operation as the cancer surgery (primary or immediate reconstruction), or at a later date once chemotherapy, radiotherapy and targeted therapy are complete (delayed reconstruction). The choice is discussed with the patient.

• Advantage of immediate reconstruction: resection and reconstruction are completed under one anaesthetic.
• Disadvantage: the operation is extended by four to five hours, and recovery takes longer.

Reconstruction options

The method depends on the patient's choice, the surgeon's expertise, the size of the breast and the size of the opposite breast. The options Dr. Jain described are:

• Latissimus dorsi flap with an implant. The latissimus dorsi muscle is brought round from the back to cover the defect, with an implant beneath it. This suits a small breast in which the whole breast must be reconstructed.
• Transverse rectus abdominis myocutaneous (TRAM) flap. Tissue is taken from the lower abdomen with the rectus abdominis muscle.
• Deep inferior epigastric perforator (DIEP) flap. A free flap of abdominal skin and fat, based on the deep inferior epigastric vessels, which Dr. Jain's team generally uses for a full primary breast reconstruction.
• Skin-sparing mastectomy with an implant. When the skin envelope can be preserved, a saline or silicone implant can be placed directly.

Indicative figures are on the breast reconstruction surgery cost page, and related guides sit in the plastic and reconstructive surgery hub.

Robotic breast surgery: where it stands

Robotic breast surgery is emerging but is not yet the standard of care. Robotic mastectomy and robotic axillary clearance are being introduced, and Dr. Jain's team has begun performing them, but numbers are very limited: one or two cases at the time of the session. The technique depends on skin-sparing surgery. The breast is removed through an incision in the axilla, so no scar is visible on the front of the chest wall, and the same instruments are used to clear the axillary nodes. Dr. Jain does not yet see much advantage in the robotic approach. It needs considerable experience and is not widely available.

After the operation

The full pathology report, usually available around 10 days after surgery, determines what follows: chemotherapy, hormone therapy, targeted therapy and radiotherapy. Dr. Jain's approach to sequencing these, and to sparing selected women chemotherapy, is covered in when chemotherapy can be avoided in early breast cancer. His later breast cancer treatment protocol by stage and subtype revisits the contraindications to conservation from his September 2026 session, and indicative surgical costs are on the breast cancer surgery cost page.