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Charged particle irradiation of sacral chordomas
R Schoenthaler1, J R Castro, P L Petti
1University of California Lawrence Berkeley Laboratory, Department of Radiation Oncology, Berkeley 94720.
Purpose:
The purpose of this report is determine the impact of charged particle irradiation at Lawrence Berkeley Laboratory (LBL) in treating patients with sacral chordomas. Overall survival, local control, complications, and predictive parameters are analyzed.
Methods And Materials:
Fourteen patients with sacral chordomas were treated with the charged particles helium and neon between 1977 and 1989. The median dose was 7565 cGyE and the median follow up is 5 years. All patients were treated post-operatively; ten had gross residual disease.
Results:
Kaplan-Meier survival at 5 years is 85%. Overall 5-year local control is 55%. A trend to improved local control at 5 years was seen in patients treated with neon when compared to patients treated with helium (62% vs 34%), in patients following complete resection versus patients with gross residual tumor (75% vs 40%), and in patients who had treatment courses under 73 days (61% vs 21%). Distant metastases were seen in two patients (14%). No patient developed neurologic sequelae or pain syndromes. One previously irradiated patient required colostomy, one patient had delayed wound healing following a negative post-radiation biopsy, and one patient developed a second malignancy. There were no genitourinary complications.
Conclusion:
Our experience indicates that post-operative charged particle irradiation of sacral chordomas appears to result in reasonable local control and survival with acceptable risk, and that additional evaluation on the use of heavy charged particles is warranted.