PROS-2 Dose Response Effects of Exogenous Testosterone on the Prostate
- Conditions
- Healthy
- Interventions
- Registration Number
- NCT01327495
- Lead Sponsor
- University of Washington
- Brief Summary
The investigators will conduct a three-month, randomized, placebo-controlled trial comparing the effects of increasing doses of androgen supplementation with Testosterone (T) gel on the prostate in healthy men who are treated with acyline to block gonadal androgen production.
- Detailed Description
The investigators overall goals are (i) to determine the relationship between serum and prostate tissue hormone concentrations in men in response to increasing doses of exogenous androgens; (ii) to determine the impact that alterations in serum and tissue testosterone concentrations have on prostate epithelial cell function and phenotype; and (iii) to determine the relationships between prostatic androgens and alterations in the tissue microenvironment. The investigators will perform a study in healthy, middle-aged men to address the following Specific Aims:
Specific Aims: To compare the dose-response relationships between serum testosterone and intraprostatic androgens and androgen action, and serum testosterone and anabolic activity in healthy, middle-aged men.
Hypothesis: The investigators hypothesize that very low levels of serum testosterone will lower concentrations of intraprostatic testosterone and dihydrotestosterone (DHT). However, when serum testosterone concentrations are within or even above the normal range there will be no significant increases in intraprostatic testosterone and dihydrotestosterone. In contrast, the investigators expect that anabolic activity will increase with increasing concentrations of circulating testosterone.
Secondarily, the investigators hypothesize that increasing levels of serum testosterone beyond the low normal range will have little impact on androgen action within the prostate.
Approach: The investigators will conduct a randomized, placebo-controlled trial in healthy men who are medically castrated and administered one of five different doses of testosterone gel (Androgel) for 12 weeks.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- Male
- Target Recruitment
- 62
In good health, without severe systemic illness (i.e., renal, liver, cardiac or lung disease, cancer, insulin dependent diabetes)
- Male between the ages of 25 and 55 years old
- Able to understand and comply with protocol instructions and requirements
- International Prostate Symptom Score (IPSS) <11
- Agrees to not donate blood during the study
- Normal serum total T, LH, FSH, urine analysis, COMP, CBC and sperm count
- History of, or current breast cancer or prostate cancer
- Clinically significant findings on digital rectal exam such as nodules, areas of induration or any other malignancy or abnormal prostate ultrasound
- History of invasive therapy for BPH
- Current or past treatment with a 5α-reductase inhibitor
- History of drug or alcohol abuse within the past 12 months
- History of a bleeding disorder or anticoagulation
- Skin disease that might interfere with T-gel absorption
- Participation in another drug study in the past 3 months
- A first-degree relative (i.e. father, brother) with a history of prostate cancer
- History of infertility or desire for fertility within 6 months, or current pregnant female partner
- Weight >320 pounds or BMI > 40
- PSA Level > 2.1
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description Arm 1: Placebo placebo acyline Placebo acyline every 2 weeks for two weeks + daily placebo gel x 12 weeks Arm 1: Placebo placebo gel Placebo acyline every 2 weeks for two weeks + daily placebo gel x 12 weeks Arm 2:1.25g Testosterone Testosterone 1% gel 1.25 g Acyline (300µg/kg every two weeks) + testosterone 1% gel 1.25 g daily x 12 weeks Arm 3: 2.5g Testosterone Testosterone 1% gel 2.5 g Acyline (300µg/kg every two weeks) + testosterone 1% gel 2.5 g daily x 12 weeks Arm 4: 5g Testosterone Testosterone 1% gel 5.0 g Acyline (300µg/kg every two weeks) + testosterone 1% gel 5.0 g daily x 12 weeks Arm 5: 10g Testosterone testosterone 1% gel 10 g Acyline (300µg/kg every two weeks) + testosterone 1% gel 10 g daily x 12 weeks Arm 6: 15g Testosterone testosterone 1% gel 15 g Acyline (300µg/kg every two weeks) + testosterone 1% gel 15 g daily x 12 weeks Arm 2:1.25g Testosterone Acyline Acyline (300µg/kg every two weeks) + testosterone 1% gel 1.25 g daily x 12 weeks Arm 4: 5g Testosterone Acyline Acyline (300µg/kg every two weeks) + testosterone 1% gel 5.0 g daily x 12 weeks Arm 3: 2.5g Testosterone Acyline Acyline (300µg/kg every two weeks) + testosterone 1% gel 2.5 g daily x 12 weeks Arm 5: 10g Testosterone Acyline Acyline (300µg/kg every two weeks) + testosterone 1% gel 10 g daily x 12 weeks Arm 6: 15g Testosterone Acyline Acyline (300µg/kg every two weeks) + testosterone 1% gel 15 g daily x 12 weeks
- Primary Outcome Measures
Name Time Method Serum Testosterone 12 weeks Dihydrotestosterone (DHT) 12 weeks Prostate Tissue Testosterone Concentrations After Treatment 12 weeks To measure intraprostatic testosterone levels
Prostate Tissue DHT Concentrations After Treatment 12 weeks To measure intraprostatic dihydrotestosterone \[DHT\] levels
- Secondary Outcome Measures
Name Time Method Prostate Specific Antigen 12 weeks Prostate Volume 12 weeks International Prostate Symptom Score (IPSS) 12 weeks IPSS score: 0-7 mildly symptomatic, 8-19 moderately symptomatic, 20-35 severely symptomatic
Trial Locations
- Locations (1)
University of Washington
🇺🇸Seattle, Washington, United States