Long-term treatment outcomes for patients with synovial sarcoma: a 40-year experience at the University of Florida.

Objectives: The objective of the study was to evaluate our long-term outcomes and prognostic factors for patients treated for localized synovial sarcoma.

Methods: We retrospectively reviewed the medical records of 92 patients treated for nonmetastatic synovial sarcoma at the University of Florida from 1967 to 2007. Most patients were treated with limb-sparing surgery and radiation (63%), 27% received surgery alone and 10% received radiation only as definitive treatment. Among patients treated with surgery and radiation, 69% received preoperative radiation and 31% received postoperative radiation.

Results: Median follow-up of living patients was 12.5 years. Overall survival rates at 5 and 10 years were 61% and 56%, respectively. Progression-free survival rates were 56% and 53%, respectively. Local control (LC) rates at 5 and 10 years were 90% and 88%, respectively. Freedom from distant metastasis rates were 57% at 5 years and 55% at 10 years. The severe complication (requiring surgery) rate was 13%. Size >5 cm predicted worse overall survival, progression-free survival, and freedom from distant metastasis, but not LC. No other prognostic factor was significant on multivariate analysis.

Conclusions: Selectively adding radiotherapy to surgery results in excellent LC for these patients. However, distant metastasis remains the principal factor limiting survival and seems directly related to primary tumor size at presentation.