Wide Local Excision — Surgical Removal of Tumour and Margin

Wide local excision, sometimes termed broad excision or re-excision, is a definitive surgical technique utilised across numerous solid malignancies. The surgeon removes the primary lesion or the previous biopsy scar together with a specified margin of normal-appearing tissue in three dimensions. The width of this healthy border depends on tumour type, biological aggressiveness, depth of invasion, and anatomical location.

Following removal, a pathologist systematically evaluates the outer boundaries of the resected specimen. If cancer cells do not reach the inked outer edge, the margins are deemed clear or negative. Conversely, if malignant cells touch or approach the margin, further surgical excision or adjuvant local therapy, such as radiotherapy, may be required to achieve complete local tumour control.

Achieving clear surgical margins is one of the most critical predictors of long-term local cancer control. A successful wide local excision directly lowers the risk of the tumour returning in the same area. Furthermore, the final pathology report details precise tumour measurements, invasion depth, and margin status, which guide your wider oncology team in deciding whether you need additional treatments like radiation, chemotherapy, or immunotherapy.

Before the operation, imaging tests such as ultrasound, MRI, or CT scans help assess tumour depth and boundaries. Following excision, the tissue specimen undergoes histological examination with margin assessment. Pathologists evaluate biomarkers such as BRAF mutations in melanoma, or oestrogen, progesterone, and HER2 receptors in breast specimens, which further clarify the biological profile and direct subsequent systemic treatment.

Wide local excision is most widely utilised in the management of skin cancers, notably melanoma, squamous cell carcinoma, and basal cell carcinoma. It is also a standard approach in breast-conserving surgery (lumpectomy) for early-stage breast cancer. Additionally, this surgical method is frequently used to manage soft tissue sarcomas and select head and neck tumours where tissue preservation is vital.

If clear margins are confirmed, patients may move straight to active surveillance or proceed with planned adjuvant therapies. If microscopic examination reveals positive or close margins, a repeat excision may be recommended. In cases where further surgery is anatomically impractical or cosmetically unacceptable, adjuvant radiotherapy is frequently considered to eradicate any residual microscopic disease in the surgical bed.