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Medline ® Abstract for Reference 157

of 'Principles of cancer immunotherapy'

157
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Evaluation of Immune-Related Response Criteria and RECIST v1.1 in Patients With Advanced Melanoma Treated With Pembrolizumab.
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Hodi FS, Hwu WJ, Kefford R, Weber JS, Daud A, Hamid O, Patnaik A, Ribas A, Robert C, Gangadhar TC, Joshua AM, Hersey P, Dronca R, Joseph R, Hille D, Xue D, Li XN, Kang SP, Ebbinghaus S, Perrone A, Wolchok JD
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J Clin Oncol. 2016;34(13):1510. Epub 2016 Mar 7.
 
PURPOSE: We evaluated atypical response patterns and the relationship between overall survival and best overall response measured per immune-related response criteria (irRC) and Response Evaluation Criteria in Solid Tumors, version 1.1 (RECIST v1.1) in patients with advanced melanoma treated with pembrolizumab in thephase Ib KEYNOTE-001 study (clinical trial information: NCT01295827).
PATIENTS AND METHODS: Patients received pembrolizumab 2 or 10 mg/kg every 2 weeks or every 3 weeks. Atypical responses were identified by using centrally assessed irRC data in patients with≥28 weeks of imaging. Pseudoprogression was defined as≥25% increase in tumor burden at week 12 (early) or any assessment after week 12 (delayed) that was not confirmed as progressive disease at next assessment. Response was assessed centrally per irRC and RECIST v1.1.
RESULTS: Of the 655 patients with melanoma enrolled, 327 had≥28 weeks of imaging follow-up. Twenty-four (7%) of these 327 patients had atypical responses (15 [5%]with early pseudoprogression and nine [3%]with delayed pseudoprogression). Of the 592 patients who survived≥12 weeks, 84 (14%) experienced progressive disease per RECIST v1.1 but nonprogressive disease per irRC. Two-year overall survival rates were 77.6% in patients with nonprogressive disease per both criteria (n = 331), 37.5% in patients with progressive disease per RECIST v1.1 but nonprogressive disease per irRC (n = 84), and 17.3% in patients with progressive disease per both criteria (n = 177).
CONCLUSION: Atypical responses were observed in patients with melanoma treated with pembrolizumab. Based on survival analysis, conventional RECIST might underestimate the benefit of pembrolizumab in approximately 15% of patients; modified criteria that permit treatment beyond initial progression per RECIST v1.1 might prevent premature cessation of treatment.
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F. Stephen Hodi, Dana-Farber Cancer Institute, Boston, MA; Wen-Jen Hwu, The University of Texas MD Anderson Cancer Center, Houston; Amita Patnaik, South Texas Accelerated Research Therapeutics, San Antonio, TX; Richard Kefford, Westmead Hospital, Melanoma Institute Australia, and Macquarie University; Peter Hersey, University of Sydney, Sydney, Australia; Jeffrey S. Weber, H. Lee Moffitt Cancer Center, Tampa; Richard Joseph, Mayo Clinic, Jacksonville, FL; Adil Daud, University of California San Francisco, San Francisco; Omid Hamid, The Angeles Clinic and Research Institute; Antoni Ribas, University of California Los Angeles, Los Angeles, CA; Caroline Robert, Gustave-Roussy and Paris-Sud University, Villejuif-Paris-Sud, France; Tara C. Gangadhar, Abramson Cancer Center, Philadelphia, PA; Anthony M. Joshua, Princess Margaret Hospital, Toronto, Ontario, Canada; Roxana Dronca, Mayo Clinic, Rochester, MN; Darcy Hille, Dahai Xue, Xiaoyun Nicole Li, S. Peter Kang, Scot Ebbinghaus, and Andrea
PMID