Efficacy and safety of trabectedin for the treatment of advanced uterine or ovarian carcinosarcoma: Results of a phase II multicenter clinical trial (MITO-26).

Objective: This open-label phase II clinical trial evaluated the antitumor activity and safety of trabectedin in patients with advanced ovarian (OC) or uterine carcinosarcomas (UC).
Methods: Eligible patients were adults (≥18 years) with histologically proven recurrent OC/UC not amenable to surgery or radiotherapy who received up to two prior chemotherapy lines. Trabectedin 1.3 mg/m ² was administered as a 3-h infusion every three weeks. The primary endpoint was objective response rate (ORR) as per RECIST v.1.1. If at least 8 of 43 patients (18.6%) achieve an objective response, trabectedin would be declared worthy for further investigations.
Results: Forty-five patients with either OC (n = 32) or UC (n = 13) from seven MITO centers across Italy were enrolled. The ORR was 11.9% (90% CI: 6-23) and included two patients with a complete response and three with a partial response. Eight patients (19.0%) had disease stabilization for a disease control rate of 31.0% (90% CI: 20-44). Median progression-free survival was 2.01 months (95% CI: 1.78-2.30) and median overall survival was 4.64 months (95% CI: 3.19-8.29). Neutrophil count decreases (n = 8, 18.2%) and transaminase increases (n = 6, 13.6%) were the most common grade 3-5 adverse events related with trabectedin. Two patients died due to trabectedin-related grade 5 hematological toxicity.
Conclusion: Although trabectedin did not meet the prespecified activity criteria, it confers modest but clinically meaningful benefit to patients with advanced OC/UC as being as effective as any other available treatment for this indication. The toxicity profile appears in line with that previously reported for the drug.
Competing Interests: Declaration of Competing Interest DL reports personal fees, travel support and institutional grants and founding from PharmaMar. SP reports personal fees from MSD, AstraZeneca, Roche, PharmaMar, Clovis and GSK; research funding from AstraZeneca, MSD, Roche and Pfizer. VS reports personal fees from MSD, GSK, Roche, PharmaMar, Clovis, Eisai and AstraZeneca; travel support from Roche, PharmaMar and AstraZeneca; funding from MSD, GSK, Roche and AstraZeneca. AB (Alice Bergamini) reports personal fees from GSK, PharmaMar, Clovis, Eisai and AstraZeneca/MSD; funding from GSK and AstraZeneca/MSD. All remaining authors have declared no conflicts of interest.
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