VAIL, CO USA (UroToday.com) - Background: Two oral agents have recently been approved for the treatment of patients with metastatic castration-resistant prostate cancer (mCRPC): abiraterone acetate (AA) combined with prednisone (P) for treatment of patients with mCRPC and enzalutamide (ENZ) for patients with mCRPC previously treated with docetaxel.
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Although corticosteroid (CS) co-administration is not required in ENZ prescribing information, 48% of ENZ-treated patients receive CS according to a large phase III clinical trial. To date, real-world CS utilization patterns in AA- and ENZ-treated patients has not been reported.
Methods: ProMetis Lx administrative claims data covering multiple health plans were used to identify patients with ≥1 PC diagnosis (ICD-9 185, V10.46) during ≥6 months of claims activity before the first AA or ENZ claim (index date). The proportion of patients receiving CS (identified by NDC codes) during AA or ENZ treatment (observation period-defined as first to end of last AA or ENZ prescription) was reported using descriptive statistics. Additionally, dosing and medication possession ratio (MPR) were calculated for the subset of patients receiving P.
Results: A total of 3 228 AA-treated and 675 ENZ-treated PC patients were identified. Baseline comorbidities patterns were similar between treatment groups for hypertension (AA 55%, ENZ 56%), diabetes (25% both groups), and cardiovascular disease (28% both groups). The mean (SD) observation period for AA-treated patients was 142 (133) days and for ENZ-treated patients was 74 (46) days.
Conclusions: CS use was common in PC patients prior to and during treatment with AA and ENZ. While this data set may underreport CS use, patterns of CS use are consistent with clinical trial data. Further research based on data with longer follow-up and additional observational datasets is warranted.
Presented by Marie-Helene Lafeuille, Amanda Grittner, Patrick Lefebvre, Lorie A. Ellis, and R. Scott McKenzie at the 24th International Prostate Cancer Update - February 19 - 22, 2014 - Cascade Conference Center - Vail, Colorado USA
Groupe d’analyse, Ltee, Montreal, QC, Canada
Janssen Scientific Affairs LLC, Horsham, PA