Lumpectomy — Breast-Conserving Cancer Surgery

A lumpectomy, also known medically as a partial mastectomy or wide local excision, is an operation designed to excise a malignant breast lesion while leaving the majority of normal breast tissue intact. The primary objective is to obtain 'clear margins'—meaning no cancer cells are visible at the outer boundary of the removed specimen under microscopic analysis.

Depending on clinical staging, a lumpectomy is frequently performed alongside a sentinel lymph node biopsy to evaluate whether cancer has spread to the axillary nodes. In the vast majority of cases, lumpectomy is followed by adjuvant radiation therapy to the remaining breast tissue to eradicate microscopic residual disease and reduce the risk of recurrence.

Choosing between a lumpectomy and a mastectomy is one of the most important decisions an individual faces after an early-stage breast cancer diagnosis. Decades of large-scale clinical trials have demonstrated that a lumpectomy followed by radiotherapy offers equivalent long-term survival rates to a total mastectomy. Knowing this empowers patients to weigh factors like cosmetic preferences, surgical recovery time, personal lifestyle, and the need for daily postoperative radiation sessions when selecting their optimal treatment path.

Before surgery, tumours are assessed using digital mammography, ultrasound, or breast MRI. If non-palpable, a radiologist places a localisation wire, magnetic seed, or radioactive clip to guide the surgeon. After removal, pathologists assess histology, surgical margin width, and tumour biomarkers including oestrogen receptor (ER), progesterone receptor (PR), and HER2 protein amplification.

Lumpectomy is primarily used in the management of early-stage invasive breast cancers (such as invasive ductal carcinoma and invasive lobular carcinoma) as well as non-invasive conditions like ductal carcinoma in situ (DCIS). It can also be performed following neoadjuvant chemotherapy to shrink larger breast tumours down to an operable size.

A successful lumpectomy forms the core of breast-conserving therapy. If pathology shows positive margins, re-excision may be required. Adjuvant whole-breast radiation therapy typically follows to minimise local recurrence. Depending on the biological characteristics of the tumour, systemic therapies like endocrine therapy, targeted agents, or adjuvant chemotherapy may be prescribed.