10040 Background: No standard salvage regimen is available for recurrent or refractory sarcoma. Only a few studies using vincristine (V), irinotecan (I), and temozolomide (T) for rhabdomyosarcoma or Ewing sarcoma have been conducted mostly in pediatric age. We investigated the efficacy and toxicity of VIT regimen for several relapsed or refractory sarcomas in children and young adults. Methods: We retrospectively reviewed the relapsed or refractory sarcoma patients who were treated at the Center for Pediatric Cancer of the National Cancer Center, Korea between 2012 and 2018. VIT regimen given every 3 week schedule was as follows; V, 1.5mg/m2 i.v. on day 1, I, 50mg/m2 i.v. on days 1-5, and T, 100mg/m2 p.o. on days 1-5. Cefixime prophylaxis at 4mg/kg/day p.o. was administered to reduce irinotecan-induced diarrhea. Results: Total 26 patients (12 males) were treated with VIT during the study period. Patients were diagnosed with rhabdomyosarcoma ( n= 8), osteosarcoma ( n= 7), Ewing sarcoma ( n= 3), synovial sarcoma ( n= 3), alveolar soft part sarcoma ( n= 2), and mixed rhabdomyosarcoma and liposarcoma, hemangiopericytoma and desmoplastic small round cell tumor, one for each. Median age at the start of VIT was 18.5 years (range 2.0-39.9). VIT was delivered as the 2nd to 7th line of treatment, with the 4th line most common (9/26, 34.6%). Number of administered courses were 1-18, with two courses most common (6/26, 23.1%). Of the 25 evaluable patients, we had 2 partial response (PR), 13 stable disease (SD), and 11 progressive disease (PD) with an overall control rate (CR + PR + SD) of 60.0% as assessed by RECIST 1.1. According to diagnoses, we observed 4SD and 4PD for rhabdomyosarcoma; 1PR, 2SD and 4PD for osteosarcoma; 1PR, 1SD and 1 non-evaluable for Ewing sarcoma; 2SD and 1PD for synovial sarcoma; 2SD for alveolar soft part sarcoma. With a median follow-up of 24 months, 5 patients were alive without disease; 9 were alive with disease; 12 died of PD. Progression-free survival rate at one year was 33.8%, and overall survival rate was 79.3% at one year and 45.5% at 2 years. Of the 26 patients, two patients had grade 4 neutropenia; two had grade 3 colitis and another two had grade 3 neutropenic fever; 8 had grade 2 diarrhea. Grade 4 non-hematologic toxicity or treatment-related mortality was not observed. Conclusions: VIT was effective especially for disease control and relatively safe in our cohort of sarcoma patients.
Detection ofSYTandEWSGene Rearrangements by Dual-Color Break-Apart CISH in Liquid-Based Cytology Samples of Synovial Sarcoma and Ewing Sarcoma/Primitive Neuroectodermal Tumor