Additional analysis of the secondary end point of biochemical recurrence rate in a phase 3 trial (CS21) comparing degarelix 80 mg versus leuprolide in prostate cancer patients segmented by baseline characteristics - Abstract

BACKGROUND: Recent data suggest prostate-specific antigen (PSA) progression may predict overall survival in prostate cancer patients.

OBJECTIVE: To compare the activity of degarelix and leuprolide regarding PSA recurrence-free survival.

DESIGN, SETTING, AND PARTICIPANTS: Phase 3, 1-yr, multicentre, randomised, open-label trial comparing the efficacy and safety of degarelix at 240 mg for 1 mo, and then 80 mg monthly (240/80 mg); degarelix at 240 mg for 1 mo, and then 160 mg monthly; and leuprolide at 7.5 mg/mo. Overall, 610 patients with histologically confirmed prostate cancer (all stages), for whom androgen deprivation therapy was indicated, were included. The primary end point of this trial has been reported previously; the protocolled and exploratory subgroup analyses reported in this paper focus on degarelix at 240/80 mg (dose approved by the US Food and Drug Administration and the European Medicine Evaluation Association for the treatment of patients with hormone-naive advanced prostate cancer).

MEASUREMENTS: PSA progression-free survival (two consecutive increases in PSA of 50% compared with nadir and ≥ 5 ng/ml on two consecutive measurements at least 2 wk apart or death) and change in PSA were reviewed. Effects of baseline disease stage (localised, locally advanced, and metastatic) and PSA level (<10, 10-20, >20-50, and >50 ng/ml) were analysed.

RESULTS AND LIMITATIONS: Patients receiving degarelix showed a significantly lower risk of PSA progression or death compared with leuprolide (p=0.05). PSA recurrences occurred mainly in patients with advanced disease and exclusively in those with baseline PSA >20 ng/ml. Patients with PSA >20 ng/ml had a significantly longer time to PSA recurrence with degarelix (p=0.04). The relatively low number of patients in each subgroup is a limitation of this study.

CONCLUSIONS: These results generate the hypothesis that degarelix at 240/80 mg offers improved PSA control compared with leuprolide. PSA recurrences occurred almost exclusively in patients with metastatic prostate cancer or high baseline PSA during this 1-yr study. Further studies are warranted to confirm these findings.

Written by:
Tombal B, Miller K, Boccon-Gibod L, Schröder F, Shore N, Crawford ED, Moul J, Jensen JK, Kold Olesen T, Persson BE   Are you the author?
Cliniques Universitaires Saint Luc/Université Catholique de Louvain, Brussels, Belgium.

Reference: Eur Urol. 2010 May;57(5):836-42.
doi: 10.1016/j.eururo.2009.11.029

PubMed Abstract
PMID: 19962227

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