Abstract. Surgical resection is a well-established treatment option for sarcoma. However, anatomical barriers often hamper radical surgical procedures. The treatment of unresectable sarcoma, including local or distant failures following initial treatment, is challenging. The aim of the present study was to analyze the outcome of radiotherapy (RT) for refractory sarcoma, including unresectable, metastatic and recurrent disease, following radical treatment. We retrospectively reviewed a total of 67 tumors in 28 patients who were treated with RT between 2007 and 2014. Clinical target volume (CTV) was generally not defined in a preventive manner; therefore, in the majority of the cases, CTV equaled the gross tumor volume. The total delivered dose, number of fractions and biological equivalent dose were 52 (range, 40-69), 10 (range, 4-24) and 92.2 (range, 56-119.6) Gy, respectively. Only 1 patient developed local failure, with a median follow-up of 11 months (range, 1-59 months). Therefore, the 12-month progression-free survival rate for 67 sites was 96.8%. The overall survival rates at 12 and 36 months were 75.8 and 30.2%, respectively. A total of 2 patients developed grade >2 toxicities, including grade 3 mucositis and grade 4 pericardial effusion. Our results demonstrated that radical RT using modern techniques is highly feasible, achieves excellent local control, and may be an effective treatment option for refractory sarcoma.
IntroductionSurgical removal, requiring wide excision with negative margins, is a standard treatment option for sarcoma (1,2).However, several factors, including anatomical barriers, make radical surgical procedures more challenging.Approximately 50% of patients with sarcoma develop metastases during the course of the disease (3). However, the treatment for metastatic sarcoma is currently insufficient and represents a challenge (1-4).Solid tumor metastases are considered non-curable. In addition, metastatic disease is associated with poor outcome, as few patients achieve durable disease control (4). A number of sarcomas exhibit a unique biological preference for the lungs, which are often the only sites of metastatic disease. Therefore, controlling these specific sites of progression may improve survival (3).In recent years, the use of local treatment for sarcoma has increased. Historically, surgical resection of metastases has been primarily investigated in young patients. There is also evidence supporting the benefit of surgery for the treatment of metastases from soft tissue sarcomas, with surgery improving survival in selected cases (5). This aggressive surgical approach was retrospectively assessed for several sarcoma subtypes, providing an evidential foundation for ablative techniques. Surgery currently has the highest level of evidential support for the ablation of limited metastases, due to reports of patients cured from metastases (6).Radiotherapy (RT) is integral in multimodal treatment and palliative care (1,2). The use of RT is more generally accepted for the treatment of border...