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Medline ® Abstract for Reference 21

of 'Chemotherapy in castration-resistant prostate cancer'

Phase III Study Comparing a Reduced Dose of Cabazitaxel (20 mg/m(2)) and the Currently Approved Dose (25 mg/m(2)) in Postdocetaxel Patients With Metastatic Castration-Resistant Prostate Cancer-PROSELICA.
Eisenberger M, Hardy-Bessard AC, Kim CS, Géczi L, Ford D, Mourey L, Carles J, Parente P, Font A, Kacso G, Chadjaa M, Zhang W, Bernard J, de Bono J
J Clin Oncol. 2017;35(28):3198. Epub 2017 Aug 15.
Purpose Cabazitaxel 25 mg/m(2) (C25) significantly improved overall survival (OS) versus mitoxantrone ( P<.001) in postdocetaxel patients with metastatic castration-resistant prostate cancer (mCRPC) in the phase III TROPIC study. The phase III PROSELICA study ( ClinicalTrials.gov identifier: NCT01308580) assessed the noninferiority of cabazitaxel 20 mg/m(2) (C20) versus C25 in postdocetaxel patients with mCRPC. Methods Patients were stratified by Eastern Cooperative Oncology Group performance status, measurability of disease per Response Evaluation Criteria in Solid Tumors (RECIST), and region, and randomly assigned to receive C20 or C25. To claim noninferiority of C20 (maintenance of≥50% of the OS benefit of C25 v mitoxantrone in TROPIC) with 95% confidence level, the upper boundary of the CI of the hazard ratio (HR) for C20 versus C25 could not exceed 1.214 under a one-sided 98.89% CI after interim analyses. Secondary end points included progression-free survival, prostate-specific antigen (PSA), tumor and pain responses and progression, health-related quality of life, and safety. Results Overall, 1,200 patients were randomly assigned (C20, n = 598; C25, n = 602). Baseline characteristics were similar in both arms. Median OS was 13.4 months for C20 and 14.5 months for C25 (HR, 1.024). The upper boundary of the HR CI was 1.184 (less than the 1.214 noninferiority margin). Significant differences were observed in favor of C25 for PSA response (C20, 29.5%; C25, 42.9%; nominal P<.001) and time to PSA progression (median: C20, 5.7 months; C25, 6.8 months; HR for C20 v C25, 1.195; 95% CI, 1.025 to 1.393). Health-related quality of life did not differ between cohorts. Rates of grade 3 or 4 treatment-emergent adverse events were 39.7% for C20 and 54.5% for C25. Conclusion The efficacy of cabazitaxel in postdocetaxel patients with mCRPC was confirmed. The noninferiority end point was met; C20 maintained≥50% of the OS benefit of C25 versus mitoxantrone in TROPIC. Secondary efficacy end points favored C25. Fewer adverse events were observed with C20.
Mario Eisenberger, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD; Anne-Claire Hardy-Bessard, Centre Armoricain d'Oncologie, Centre Armoricain de Radiothérapie, d'Imagerie Médicale et d'Oncologie-Hôpital PrivéDes Côtes d'Armor, Plérin; Loïc Mourey, Institut Claudius Regaud, l'Institut Universitaire du Cancer de Toulouse Oncopole, Toulouse; Mustapha Chadjaa, Sanofi, Vitry-sur-Seine, France; Choung Soo Kim, Asan Medical Center, Seoul, South Korea; Lajos Géczi, National Institute of Oncology, Budapest, Hungary; Daniel Ford, City Hospital, Cancer Centre at Queen Elizabeth Hospital, Birmingham; Johann de Bono, Prostate Cancer Targeted Therapy Team, Royal Marsden National Health Service Foundation Trust/The Institute of Cancer Research, Sutton, United Kingdom; Joan Carles, Vall d'Hebron University Hospital, Vall d'Hebron Institute of Oncology, Barcelona; Phillip Parente, Eastern Health Clinical School, Monash University, Box Hill Hospital, Melbourne, Victoria,