Improved Survival after Pulmonary Metastasectomy for Soft Tissue Sarcoma

Introduction: Survival after pulmonary metastasectomy for soft tissue sarcoma (STS) has been lower than in osteosarcoma (14-40% versus 40-50%). With improved patient selection criteria and advanced chemotherapy agents, we hypothesized that survival after metastasectomy for STS has improved in recent years. Methods: Retrospective study of 48 patients undergoing pulmonary metastasectomy for STS between 1995 and 2007. Potential predictors of overall survival and disease-free survival (DFS) were examined using the log-rank test or Cox regression. Multivariate analysis was conducted using Cox regression. Results: Overall survival after initial metastasectomy was 67% and 52% at 3 and 5 years, respectively; DFS was 17% and 10% at 3 and 5 years. Univariate analysis indicated that <= 2 pulmonary metastases (p = 0.03), diameter of largest metastasis <= 2 cm (p = 0.09), and the absence of extrapulmonary metastases (p = 0.10) were associated with longer overall survival. Absence of extrapulmonary metastases (p = 0.07) and smaller size of the largest pulmonary metastasis (p = 0.06) were associated with longer DFS. Before 2001, 46.7% of patients received adjuvant chemotherapy versus 72.7% after (p = 0.10). Neither use of chemotherapy nor chemotherapy type was related to overall survival or DFS. Conclusion: Five-year overall survival is substantially higher after pulmonary metastasectomy for STS in our study relative to previously published results (52% versus 14-40%). This improvement does not seem to be the result of greater use of, or newer, chemotherapeutic regimens. Among potential explanations, improved patient selection is the most likely factor.