THE SURGICAL MARGIN REVISTED IN SOFT TISSUE TUMOURS

Abstract

The aim of this study was to assess the significance of the extent and adequacy of the surgical margin on three outcome variables; survival, metastasis and local recurrence. We statistically analysed (Cox proportional hazards regression modelling) 279 consecutive patients who presented with soft tissue sarcoma without meta-static disease. They were treated by a single surgeon to a standard protocol in two centres. In terms of overall survival, the failure to achieve a wide surgical margin by contaminating the resection, led to an elevenfold increase in the relative death rate (p=0.04). However, where the margin was not contaminated (even if the margin was closer than 1 mm) then the overall survival rate was similar across all groups of patients with a clear margin up to 20 mm. A large margin greater than 20mm afforded the lowest risk to overall survival. The extent of the surgical margin was not statistically significant in the development of metastatic disease. The presence of a contaminated surgical margin and a narrow margin less than 1mm led to a significantly higher rate of local recurrence (p=0.02) A margin greater than 1 mm allowed a satisfactory outcome in terms of a low local recurrence rate and the extent of the margin up to 20mm was not statistically important. Patients who had radical resections did poorly and generally represent a group where palliative surgery was performed, and there was a very high relative metastasis and death rate. Our study provides statistically significant evidence that increasing width of resection improves local control and overall survival. However a narrow margin due to anatomical constraints such as bone or neurovascular structures does not significantly compromise patient outcome and this provides guidance for surgical decision making in limb salvage surgery.