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Presidential Symposium 3

2494 - Final overall survival (OS) from the AFFINITY phase 3 trial of custirsen and cabazitaxel/prednisone in men with previously treated metastatic castration-resistant prostate cancer (mCRPC)

Date

10 Oct 2016

Session

Presidential Symposium 3

Presenters

Karim Fizazi

Citation

Annals of Oncology (2016) 27 (6): 1-36. 10.1093/annonc/mdw435

Authors

K. Fizazi1, S.J. Hotte2, F. Saad3, B. Alekseev4, V.B. Matveev5, A. Flechon6, G. Gravis7, F. Joly8, K.N. Chi9, Z. Malik10, P. Stewart11, C. Jacobs12, T.M. Beer13

Author affiliations

  • 1 Department Of Cancer Medicine, Institut Gustave Roussy, 94805 - Villejuif/FR
  • 2 Oncology, Juravinski Cancer Centre, L8V 5C2 - Hamilton/CA
  • 3 Urology, CRCUM-Universite de Montreal, Montreal/CA
  • 4 Urology/oncology, N. N. Blokhin Russian Cancer Research Center, Moscow/RU
  • 5 Research, N. N. Blokhin Russian Cancer Research Center, 115478 - Moscow/RU
  • 6 Medical Oncology, Centre Léon Bérard, Lyon/FR
  • 7 Medical Oncology, Institute Paoli Calmettes, 13009 - Marseille/FR
  • 8 Medical Oncology, Centre Francois Baclesse, 14000 - Caen/FR
  • 9 Medical Oncology, BC Cancer Agency, Vancouver General Hospital University of British Columbia, Vancouver/CA
  • 10 Clinical Oncology, Clatterbridge Centre for Oncology NHS Foundation Trust, Wirral/GB
  • 11 Clinical Development, OncoGenex Pharmaceuticals, Inc., 98011 - Bothell/US
  • 12 Clinical Research, OncoGenex Pharmaceuticals, Inc., 98011 - Bothell/US
  • 13 Knight Cancer Institute, Oregon Health Science University, 97239 - Portland/US
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Abstract 2494

Background

Treatment failure is the major barrier to extending survival in patients (pts) with advanced cancer. Clusterin (CLU) is a cytoprotective protein upregulated by chemotherapy in cancer cells. Custirsen (C) inhibits CLU production in vivo. This international phase 3 study (AFFINITY; Clinicaltrials.gov NCT01578655) evaluated C in combination with cabazitaxel/prednisone (Cbz/P) in pts with mCRPC. Co-primary objectives were to evaluate overall survival (OS) in pts receiving Cbz/P/C compared to pts receiving Cbz/P alone for all randomized (ITT) pts and a poor prognosis subgroup.

Methods

Pts with progressive disease after docetaxel, adequate organ function, and Karnofsky score ≥70% were randomized to Cbz/P/C or Cbz/P. Treatment consisted of 21-day cycles of 25 mg/m2 IV Cbz on day 1 with 10 mg oral P daily with or without 640 mg IV C on days 1, 8, and 15 (plus 3 prior loading doses) until disease progression, unacceptable toxicity, or 10 cycles. Overall type I error probability (alpha) was one-sided 0.025, allocated as 0.01 and 0.015 for ITT and poor prognosis final analyses, respectively, with 85% power. Hypothesized HR for ITT was 0.75 at 547 events. Hypothesized HR for poor prognosis was 0.69 assuming 299 events.

Results

635 men were randomized: median age 68 yrs, Karnofsky score ≤80% in 50%. Demographics and exposure to Cbz/P were similar for both arms. In ITT population (n = 635), median OS was 14.2 mo on Cbz/P/C and 13.4 mo on Cbz/P (two-sided p = 0.529; HR 0.946, 95% CI 0.796–1.124). 62% of pts (n = 392) met criteria for poor prognosis; OS was 11.1 mo on Cbz/P/C (n = 195) and 10.9 mo on Cbz/P (n = 197) in this subset (p = 0.470; HR 0.918, 95% CI 0.727–1.158). 28.9% of pts on Cbz/P/C and 25% on Cbz/P discontinued due to progressive disease, and 21.9% and 18.9% due to adverse events (AEs). Arms were comparable in ≥Grade 3 AEs (75.9% vs 66.3%) and SAEs (49.2% vs 42.3%). The most frequently reported ≥Gr3 AEs were neutropenia, anemia, fatigue, asthenia, bone pain, and febrile neutropenia.

Conclusions

In this phase 3 study, no survival benefit was seen in pts receiving Cbz/P/C compared to Cbz/P in both ITT population and poor prognosis subset.

Clinical trial identification

NCT01578655

Legal entity responsible for the study

OncoGenex Pharmaceuticals, Inc.

Funding

OncoGenex Pharmaceuticals, Inc.

Disclosure

K. Fizazi: The author declares participation on advisory boards and honoraria from Orion, Bayer, Sanofi, Amgen, Genentech, Janssen, Astellas, and Takeda. F. Saad: Grants from OncoGenex during the conduct of the study; grants and personal fees from Sanofi, grants and personal fees from Astellas, grants and personal fees from Janssen, grants and personal fees from Amgen outside the submitted work. A. Flechon: Honoraria: Astellas, Janssen-Cilag, Sanofi, Ipsen Travel: Astellas, Janssen, Sanofi, MSD, Pfizer, Novartis, Bayer, Astra Zeneca. F. Joly: Outside the submitted work: Grant received: Astellas Board, scientific expertise, and congress: Roche, Novartis Board, scientific expertise: Sanofi, Astra Zeneca Congress: Amgen. P. Stewart: OncoGenex: Employee, stock ownership. C. Jacobs: OncoGenex: Employee, executive leadership, stock ownership. All other authors have declared no conflicts of interest.

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