Study of Histrelin Subdermal Implant in Patients With Prostate Cancer

• Suppression of testosterone via the percent of patients whose testosterone was at or below chemical castration levels (<=50 n/dL) through 52 weeks of treatment. [ Time Frame: 52 weeks ] [ Designated as safety issue: Yes ]
  

• Secondary efficacy was assessed by serum LH, PSA, and PAP, WHO Performance Status, Pain Level assessment, the National Prostatic Cancer Project (NPCP) assessment for objective clinical status, PSA status, time to disease progression, and QoL. [ Time Frame: 52 weeks ] [ Designated as safety issue: Yes ]
  

This trial was an open-label, randomized, parallel treatment, active-control multicenter study in adult males with documented metastatic prostate cancer disease who were judged to be candidates for hormone therapy.

Within 21 days prior to implant insertion, all prospective enrollees were entered into a screening period to provide medical history, demographic information, physical examination, laboratory evaluations, 12-lead ECG, bone scan, chest x-ray, liver ultrasound, concomitant medications and procedures, and a physician assessment including pain level and WHO performance scale in order to assess eligibility for the study. Written informed consent was obtained before any procedures were undertaken.

Once inclusion/exclusion criteria were met, baseline evaluations (physical assessment and examination, vital signs and weight, clinical laboratory evaluations, concomitant medications and procedures, adverse events, and a Quality of Life questionnaire) were obtained prior to implant insertion on Day 1 [Visit 1]. All appropriately screened patients were to then receive either histrelin acetate 50-mg or Zoladex 3-Month 10.8 mg implant based on 1:1 randomization at Day 1 [Visit 1]. Patients with implants were evaluated at Week 1 and 2 [Visits 2 and 3] post-insertion for testosterone and PSA concentrations, vital signs, adverse events, and concomitant medications and procedures. The Zoladex implants were replaced at Weeks 12, 24, 36, and 48 [Visits 6, 9, 12, and 15], while the histrelin acetate implants were replaced at Week 52 (Visit 16), respectively. Patients were followed monthly from Weeks 4 to 60 [Visits 4 to 18] to evaluate testosterone and PSA concentrations, adverse events, concomitant medications and procedures, disease progression, and urine and serum histrelin in the renal/hepatic impairment subgroup. Periodic clinical and subjective assessments were completed for all patients.