RT Journal Article T1 Trabectedin and RAdiotherapy in Soft Tissue Sarcoma (TRASTS): Results of a Phase I Study in Myxoid Liposarcoma from Spanish (GEIS), Italian (ISG), French (FSG) Sarcoma Groups. A1 Gronchi, Alessandro A1 Hindi, Nadia A1 Cruz, Josefina A1 Blay, Jean-Yves A1 Lopez-Pousa, Antonio A1 Italiano, Antoine A1 Alvarez, Rosa A1 Gutierrez, Antonio A1 Rincón, Inmaculada A1 Sangalli, Claudia A1 Pérez Aguiar, Jose Luis A1 Romero, Jesús A1 Morosi, Carlo A1 Sunyach, Marie Pierre A1 Sanfilippo, Roberta A1 Romagosa, Cleofe A1 Ranchere-Vince, Dominique A1 Dei Tos, Angelo P A1 Casali, Paolo G A1 Martin-Broto, Javier K1 Chemotherapy K1 Myxoid Liposarcoma K1 Neoadjuvant K1 Prognosis K1 Radiotherapy K1 Sarcoma K1 Survival K1 Trabectedin AB Myxoid liposarcoma (ML) exhibits a special sensitivity to trabectedin (T) and radiation therapy (RT). Preclinical data suggest a synergistic effect. We aimed to study safety, feasibility and activity of the administration of pre-operative concurrent T and RT in patients affected by localized resectable ML. Patients received 3 cycles (C) of T in combination with RT (45 Gy) in 25 fractions (1.8 Gy/fraction). Dose Levels for T were: - 1 (1.1 mg/m2), 0 (1.3 mg/m2) and 1 (1.5 mg/m2). Primary endpoint was safety; antitumor activity was assessed by RECIST and Choi criteria. This study is registered at ClinicalTrials.gov, number NCT02275286. The phase 1 part of the study is complete and phase 2 is ongoing. From February 2015 to May 2016, 14 patients (M/F 7/7), median age 36 years (range 24-70) and median tumor size 12.5 cm (range 7-17 cm), were enrolled. One dose limiting toxicity (G3 transaminitis) occurred at Level 0 and one (sepsis due to catheter infection) at Level 1. All patients completed RT. Five patients achieved PR (36%), 8 SD (57%), 1 distant PD (7%) by RECIST, while 12 achieved PR (86%), 1 SD (7%) and 1 distant PD (7%) by Choi criteria. Twelve patients underwent surgery. Median viable residual tumor was 5% (0-60). T in combination with RT showed a favorable safety profile and antitumor activity in localized ML. T dose of 1.5 mg/m2 is the recommended dose for the phase 2 study, which is ongoing. This study was partially supported by Pharmamar. YR 2019 FD 2019-03-11 LK https://hdl.handle.net/10668/27241 UL https://hdl.handle.net/10668/27241 LA en DS RISalud RD Apr 17, 2025