Efficacy and safety of the anti-PD-1 monoclonal antibody MK-3475 in 411 patients (pts) with melanoma (MEL)

Antoni Ribas, F. Stephen Hodi, Peter Hersey, Jeffrey S. Weber, Roxana Stefania Dronca, Hassane M. Zarour, Kevin Gergich, Xiaoyun Nicole Li, Robert Lannone, Soonmo Peter Kang, Scot Ebbinghaus, Caroline Robert, Richard Kefford, Omid Hamid, Adil Daud, Jedd D. Wolchok, Wen-Jen Hwu, Tara C. Gangadhar, Amita Patnaik, Anthony M. Joshua

Research output: Contribution to journalMeeting abstract


Background: The humanized monoclonal IgG4 anti-PD-1 antibody MK-3475 has demonstrated durable antitumor activity in MEL and NSCLC. We evaluated MK-3475 efficacy and safety in a pooled analysis of 411 MEL pts. Methods: A nonrandomized cohort of ipilimumab-naive (IPI-N) and IPI-treated (IPI-T) pts treated with MK-3475 10 mg/kg Q2W, 10 mg/kg Q3W, or 2 mg/kg Q3W and randomized cohorts of IPI-N and IPI-T pts treated with 2 Q3W or 10 Q3W were included. Response was assessed every 12 wk by RECIST 1.1 by independent central review and by immune-related response criteria (irRC) by investigator. Results: 162 pts were treated at 2 Q3W, 192 at 10 Q3W, and 57 at 10 Q2W. 190 pts were IPI-N and 221 were IPI-T. As of the 10/18/2013 cutoff, all pts had ≥6 mo follow-up and >75% had ≥9 mo follow-up. Among the 365 pts with measurable disease at baseline, ORR by RECIST was 40% (95% CI 32%-48%) in IPI-N and 28% (95% CI 22%-35%) in IPI-T pts. Responses were durable (88% ongoing at analysis). Median PFS by RECIST was 24 wk in IPI-N and 23 wk in IPI-T pts. Median OS was not reached, with 1-y OS of 71% in all pts. Benefit was observed by both RECIST and irRC at all doses and schedules in IPI-N and IPI-T pts (Table). MK-3475 demonstrated activity in all major subgroups irrespective of ECOG PS, LDH levels, BRAFmutation, M stage, and number and type of prior therapy. Overall, 12% of pts experienced drug-related grade 3/4 AEs and 4% discontinued due to a drug-related AE. There were no drug-related deaths. Conclusions: MK-3475 showed durable responses and a manageable safety profile across dose and schedules in IPI-N and IPI-T MEL pts. The observed efficacy and safety suggest MK-3475 may be an appropriate treatment for all pts with MEL. Clinical trial information: NCT01295827.
Original languageEnglish
Pages (from-to)LBA9000-LBA9000
Number of pages1
JournalJournal of Clinical Oncology
Issue number18 Supplementary
Publication statusPublished - 2014
Externally publishedYes
Event50th Annual Meeting of the American-Society-of-Clinical-Oncology - Chicago, United States
Duration: 30 May 20143 Jun 2014

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