Carbon ion radiotherapy for unresectable sacral chordomas

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
Reiko ImaiWorking Group for Bone, Soft Tissue Sarcomas

Abstract

The purpose is to evaluate the efficacy and toxicity of carbon ion radiotherapy for unresectable sacral chordomas. We performed a retrospective analysis of 30 patients with unresectable sacral chordomas treated with carbon ion radiotherapy at the Heavy Ion Medical Accelerator in Chiba, Japan. Twenty-three patients presented with no prior treatment, and the remaining 7 patients had locally recurrent disease following previous surgical resection. The median clinical target volume was 546 cm(3). The applied carbon ion dose ranged from 52.8 to 73.6 GyE (gray equivalent, median 70.4) in 16 fixed fractions over 4 weeks. At median follow-up of 30 months (range, 9 to 87 months), 26 patients were still alive and 24 patients remained continuously disease-free. Overall and cause-specific survival rates at 5 years were 52 and 94%, respectively. The overall local control rate at 5 years was 96%. Two patients experienced severe skin/soft tissue complications requiring skin grafts. No other treatment-related surgical interventions, including colostomy or urinary diversion, were carried out. All patients have remained ambulatory and able to stay at home after carbon ion radiotherapy. Carbon ion radiotherapy is effective and safe in the managem...Continue Reading

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