A noninterventional, multicenter, prospective phase IV study of trabectedin in patients with advanced soft tissue sarcoma

This prospective, noninterventional study is the first phase IV trial designed to evaluate trabectedin in patients with advanced soft tissue sarcoma in real-life clinical practice across Europe. To be included in the study, patients must have received more than or equal to one cycle of trabectedin and be currently on treatment. The primary endpoint was progression-free survival as defined by investigators. The secondary endpoints included objective response rate, disease control rate, time to progression and the growth modulation index (GMI), overall survival, and an assessment of the cancer-related symptoms and safety. A total of 218 patients from 41 European centers were evaluated. Patients received a median of six cycles per patient, mostly on an outpatient basis (n=132; 60.6%). The median progression-free survival was 5.9 months, with 70 and 49% of patients free from progression at 3 and 6 months after treatment, respectively. Three (1.4%) patients achieved a complete response and 55 (25.2%) patients achieved a partial response for an objective response rate of 26.6%. A total of 85 (39.0%) patients had disease stabilization for a disease control rate of 65.6%. The median GMI was 0.8, with 5.1 and 38.8% of patients with a GMI of greater than 1.1 to less than 1.33 and greater than or equal to 1.33, respectively. The median overall survival was 21.3 months. Febrile neutropenia (2.3% of patients), neutropenia, nausea, and pneumonia (1.4% each) were the most common trabectedin-related grade 3/4 serious adverse drug reactions. Trabectedin confers clinically meaningful long-term benefits to patients with multiple soft tissue sarcoma histotypes, being either comparable or better than those observed previously in clinical trials, and with a manageable safety profile.

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