Objectives: Long-term assessment of the efficacy and tolerability of subcutaneous abdominal histrelin acetate implants that have been inserted for more than two years.
Materials and Methods: Retrospective data collected over a six-year period at a single center from charts of 113 patients who received the subcutaneous abdominal histrelin acetate implant.
Results: Following insertion of the first implant, 92.1% and 91.8% of patients had a serum testosterone level of ≤ 30 ng/dL at 24 and 48 weeks, respectively. Serum testosterone levels remained at < 30 ng/dL for 96% of patients at two years and for 100% of patients at 3, 4, and 5 years. The testosterone levels remained significantly less than baseline (P < 0.05). Six patients (5.3%) had androgen-independent progression when followed up on the long term, increasing the mean serum PSA at 3, 4, and 5 years to 35.0 µg/L (n = 22), 30.7 µg/L (n = 13), and 132.9 µg/L (n = 8), respectively. The mean serum PSA was significantly greater than baseline during these years (P < 0.05). Eight patients (7.1%) experienced minor, but not serious, adverse events from the histrelin acetate.
Conclusion: Subcutaneous abdominal histrelin acetate implants are an effective long-term and well-tolerated administration method for treating patients with advanced prostate cancer.
Woolen S, Holzmeyer C, Nesbitt E, Siami PF. Are you the author?
Research Institute of Deaconess Clinic, 421 Chestnut Street, Evansville, IN 47713, USA; Department of Urology, Deaconess Clinic, 421 Chestnut Street, Evansville, IN 47713, USA.
Reference: Prostate Cancer. 2014;2014:490315.