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Efficacy of anti-PD-1 and ipilimumab alone or in combination in acral melanoma

  • Prachi Bhave
  • , Tasnia Ahmed
  • , Serigne N. Lo
  • , Alexander Shoushtari
  • , Anne Zaremba
  • , Judith M. Versluis
  • , Joanna Mangana
  • , Michael Weichenthal
  • , Lu Si
  • , Thierry Lesimple
  • , Caroline Robert
  • , Claudia Trojanello
  • , Alexandre Wicky
  • , Richard Heywood
  • , Lena Tran
  • , Kathleen Batty
  • , Florentia Dimitriou
  • , Anna Stansfeld
  • , Clara Allayous
  • , Julia K. Schwarze
  • Meghan J. Mooradian, Oliver Klein, Inderjit Mehmi, Rachel Roberts-Thomson, Andrea Maurichi, Hui Ling Yeoh, Adnan Khattak, Lisa Zimmer, Christian U. Blank, Egle Ramelyte, Katharina C. Kähler, Severine Roy, Paolo A. Ascierto, Olivier Michielin, Paul C. Lorigan, Douglas B. Johnson, Ruth Plummer, Celeste Lebbe, Bart Neyns, Ryan Sullivan, Omid Hamid, Mario Santinami, Grant A. McArthur, Andrew M. Haydon, Georgina V. Long, Alexander M. Menzies, Matteo S. Carlino*
*Corresponding author for this work
  • University of Melbourne
  • Westmead Hospital
  • Melanoma Institute Australia
  • Memorial Sloan Kettering Cancer Center
  • University Hospital Essen
  • Netherlands Cancer Institute
  • UniversitatsSpital Zurich (University Hospital of Zurich)
  • Universitatsklinikum Schleswig Holstein
  • Beijing Cancer Hospital
  • Centre Eugène Marquis Rennes
  • Institut de Cancerlogie Gustave Roussy
  • Istituto Nazionale Tumori IRCCS "Fondazione G. Pascale"
  • Lausanne University Hospital
  • University of Manchester (UOM)
  • Vanderbilt University Medical Center
  • Freeman Hospital Laboratory
  • APHP Hôpital Saint-Louis
  • Universitair Ziekenhuis Brussel
  • Massachusetts General Hospital
  • Austin Health
  • Warrnambool Hospital
  • Peninsula Health
  • Cedars-Sinai Medical Center
  • The Queen Elizabeth Hospital, North Western Adelaide Health Service
  • Fondazione IRCCS
  • The Alfred Hospital
  • Fiona Stanley Hospital
  • APC - AstroParticule et Cosmologie
  • University of Sydney

Research output: Contribution to journal › Article › peer-review

Abstract

Background Acral melanoma is a rare melanoma subtype with poor prognosis. Importantly, these patients were not identified as a specific subgroup in the landmark melanoma trials involving ipilimumab and the anti-programmed cell death protein-1 (PD-1) agents nivolumab and pembrolizumab. There is therefore an absence of prospective clinical trial evidence regarding the efficacy of checkpoint inhibitors (CPIs) in this population. Acral melanoma has lower tumor mutation burden (TMB) than other cutaneous sites, and primary site is associated with differences in TMB. However the impact of this on the effectiveness of immune CPIs is unknown. We examined the efficacy of CPIs in acral melanoma, including by primary site. Methods Patients with unresectable stage III/IV acral melanoma treated with CPI (anti-PD-1 and/or ipilimumab) were studied. Multivariable logistic and Cox regression analyses were conducted. Primary outcome was objective response rate (ORR); secondary outcomes were progression-free survival (PFS) and overall survival (OS). Results In total, 325 patients were included: 234 (72%) plantar, 69 (21%) subungual and 22 (7%) palmar primary sites. First CPI included: 184 (57%) anti-PD-1, 59 (18%) anti-PD-1/ipilimumab combination and 82 (25%) ipilimumab. ORR was significantly higher with initial anti-PD-1/ipilimumab compared with anti-PD-1 (43% vs 26%, HR 2.14, p=0.0004) and significantly lower with ipilimumab (15% vs 26%, HR 0.49, p=0.0016). Landmark PFS at 1 year was highest for anti-PD-1/ipilimumab at 34% (95% CI 24% to 49%), compared with 26% (95% CI 20% to 33%) with anti-PD-1 and 10% (95% CI 5% to 19%) with ipilimumab. Despite a trend for increased PFS, anti-PD-1/ipilimumab combination did not significantly improve PFS (HR 0.85, p=0.35) or OS over anti-PD-1 (HR 1.30, p=0.16), potentially due to subsequent therapies and high rates of acquired resistance. No outcome differences were found between primary sites. Conclusion While the ORR to anti-PD-1/ipilimumab was significantly higher than anti-PD-1 and PFS numerically higher, in this retrospective cohort this benefit did not translate to improved OS. Future trials should specifically include patients with acral melanoma, to help determine the optimal management of this important melanoma subtype.

Original languageEnglish
Article numbere004668
JournalJournal for ImmunoTherapy of Cancer
Volume10
Issue number7
DOIs
Publication statusPublished - 1 Jul 2022

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

  1. SDG 3 - Good Health and Well-being
    SDG 3 Good Health and Well-being

Keywords

  • CTLA-4 Antigen
  • Immunotherapy
  • Melanoma
  • Programmed Cell Death 1 Receptor

Research Highlights, Institutes and Platforms

  • Manchester Cancer Research Centre

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