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Efficacy and Safety of the Melphalan/Hepatic Delivery System in Patients with Unresectable Metastatic Uveal Melanoma: Results from an Open-Label, Single-Arm, Multicenter Phase 3 Study

  • Hepatobiliary Tumors
  • Published:
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Abstract

Background

Uveal melanoma (UM) has a poor prognosis once liver metastases occur. The melphalan/Hepatic Delivery System (melphalan/HDS) is a drug/device combination used for liver-directed treatment of metastatic UM (mUM) patients. The purpose of the FOCUS study was to assess the efficacy and safety of melphalan/HDS in patients with unresectable mUM.

Methods

Eligible patients with mUM received treatment with melphalan (3.0 mg/kg ideal body weight) once every 6 to 8 weeks for a maximum of six cycles. The primary end point was the objective response rate (ORR). The secondary end points included duration of response (DOR), overall survival (OS), and progression-free survival (PFS).

Results

The study enrolled 102 patients with mUM. Treatment was attempted in 95 patients, and 91 patients received treatment. In the treated population (n = 91), the ORR was 36.3 % (95 % confidence interval [CI], 26.44–47.01), including 7.7 % of patients with a complete response. Thus, the study met its primary end point because the lower bound of the 95 % CI for ORR exceeded the upper bound (8.3 %) from the benchmark meta-analysis. The median DOR was 14 months, and the median OS was 20.5 months, with an OS of 80 % at 1 year. The median PFS was 9 months, with a PFS of 65 % at 6 months. The most common serious treatment-emergent adverse events were thrombocytopenia (15.8 %) and neutropenia (10.5 %), treated mostly on an outpatient basis with observation. No treatment-related deaths were observed.

Conclusion

Treatment with melphalan/HDS provides a clinically meaningful response rate and demonstrates a favorable benefit-risk profile in patients with unresectable mUM (study funded by Delcath; ClinicalTrials.gov identifier: NCT02678572; EudraCT no. 2015-000417-44).

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Acknowledgment

We thank the patients, their families and caregivers, and the study teams at the participating sites. The authors acknowledge Seth Maxwell and Angela Wharton, who are employees of Delcath Systems, Inc., for their involvement in this study, including contributions to data analysis. All the authors critically reviewed the manuscript and approved the final version before submission, including the authorship list. Editorial support was provided by Preetinder Kaur of Certara under the direction of the authors following Good Publication Practice guidelines (Ann Intern Med. 2022;175:1298–1304) and was funded by Delcath Systems Inc., New York, USA.

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Correspondence to Jonathan S. Zager MD, FACS.

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Disclosure

Dr. Jonathan Zager–global principal investigator in the FOCUS phase 3 study and serves on Delcath Systems Medical Advisory Board. Education and Training grant through Delcath. Dr. Marlana Orloff–Advisory Board: Delcath, Replimune. Consultant: Immunocore. Steering Committee: Ideaya. Speaker: Immunocore. Dr. David Eschelman–Received <$5K consulting fees from Delcath. Dr. Evan Glazer–My institution was a site for the clinical trial. I received no direct payment. Delcath paid for the clinical trial to my institution. Dr. J. Howard–I was paid as a consultant to Delcath as a proctor for this trial to ensure new institutions adhered to protocol. Prof. Erika Richtig–Medical University of Graz received payments for conducting the Phase 3 study. Dr. Sebastian Ochsenreither–Advice: Immunocore, Delcath, Janssen. Speakers’ bureau: Immunocore. Dr. Georgia Beasley–Clinical trial funding paid to institution from Replimune, checkmate pharmaceuticals, Philogen, Delcath. Advisory board BMS 10.2023. Dr. Anja Gesierich–University Hospital Würzburg received payments for conducting the Phase 3 study. Professor Reinhard Dummer–intermittent, project focused consulting and/or advisory relationships with Novartis, Merck Sharp & Dhome (MSD), Bristol-Myers Squibb (BMS), Roche, Amgen, Takeda, Pierre Fabre, Sun Pharma, Sanofi, Catalym, Second Genome, Regeneron, Alligator, T3 Pharma, MaxiVAX SA, Pfizer, Simcere and touchIME outside the submitted work. Dr. Ana Arance–Consulting or advisory role: Pierre- Fabre, Novartis, Roche, BMS, MSD, Biontech. Speakers’ Bureau: Pierre- Fabre, Novartis, Roche, BMS, MSD. Travel, Accommodations, Expenses: BMS, MSD. Mr. Stephen Fenwick–Liverpool University Hospitals NHS Trust received support for conducting this Phase 3 study from the trial sponsor. Dr. Joseph Sacco–I have been a paid member of advisory boards for Delcath, Replimune and Immunocore. I have received grant funding from Astra Zeneca and BMS (paid to institution). I have had travel and conference attendance paid for by MSD, BMS and Replimune. Dr. Matthew Wheater–Institutional (University Hospital Southampton) funding for conducting a commercial trial. Personal funding for participation in advisory board for Delcath.

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Zager, J.S., Orloff, M., Ferrucci, P.F. et al. Efficacy and Safety of the Melphalan/Hepatic Delivery System in Patients with Unresectable Metastatic Uveal Melanoma: Results from an Open-Label, Single-Arm, Multicenter Phase 3 Study. Ann Surg Oncol (2024). https://doi.org/10.1245/s10434-024-15293-x

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