Factors associated with local recurrence after surgery for bone metastasis to the extremities

Background and ObjectivesWith increasing life expectancy of patients with bone metastasis, durable surgical stabilization of bone metastasis is necessary. Local recurrence (LR) can compromise surgical stabilization and necessitate retreatment. We analyzed LR rate and factors associated with LR in patients undergoing surgery for bone metastasis. MethodsPatients (n=301) who underwent surgery for bone metastasis to the extremities were reviewed. Possible factors that might be associated with LR were investigated. ResultsLR rate was 16% (49/301). Surgical margin was associated with LR, as patients with en-bloc resection had significantly less LR than patients who underwent curettage (5/66 vs 44/235, P=0.03). Prostate cancer had lowest rate (0%) of LR and colon cancer had highest rate (31%). Interval from surgery to LR differed among primary cancer types (4.53.9 months [lung cancer], vs 12.3 +/- 12.9 months [other cancers], P=0.041). In multivariate analysis, en-bloc surgical margins (HR=0.372, P=0.036) and primary cancers of breast or prostate (HR=0.391, P=0.049) were independent factors associated with longer LR-free survival. ConclusionsLR after surgery for bone metastasis to extremities is affected by surgical margin and primary cancer type. These factors, along with expected patient survival, need to be considered when planning surgery for bone metastasis to extremities.