Clinical trial NCT00861588: Effects of Isoflavone in Patients With Watchful Waiting Benign Prostate Hyperplasia
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Benign Prostate Hyperplasia
Keywords: complementary & alternative medicine
randomized control trial
uroflowmetry
quality of life
benign prostate hyperplasia
Lead sponsor: Chinese University of Hong Kong
Sponsor class: OTHER
Collaborators: name: School of Pharmacy, CUHK
First posted: 2009-03-13
Enrollment: 176
Sex: MALE
Minimum age (years): 45
Maximum age (years): 85
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: Benign prostatic hyperplasia (BPH) is a common problem among aging Caucasian men that produces significant morbidity and hea1th care costs. It is likely that BPH is just as common among Chinese men. Debate exists as to whether currently available surgical and pharmacological options for BPH are appropriate for men in the watchful-waiting stage of this condition. Evidence suggests that the consumption of soy isoflavones is related to lower rates of BPH among Asian men. The advantages of soy isoflavones over conventional therapies may include better patient compliance, improved safety and lower cost. Despite the fact that soy isoflavones are safe and contain a health-conferring ingredient with a defined mechanism of action, no randomised control trial has been performed using isoflavones to treat BPH. Therefore, a randomised control trial is proposed to test the tolerability and effectiveness of soy isoflavones (Soylife) verses placebo in 182 men with defined watchful waiting BPH over a period of 12 months. In this trial, patients who fulfill the inclusion criteria, will either be given 40mg of soy isoflavones capsule (once daily) or a placebo capsule. They will be reviewed every three months with maximal urine flow rate, international prostate symptoms score and quality of life measured. Baseline tests include RFT, LFT, FBC, MSU, PSA and testosterone and to be repeated at 6th month and 12th month. The investigators hypothesize that this intervention will reduce lower urinary tract symptoms and slow the progression of the disease.


Eligibility criteria: Inclusion Criteria:

* Chinese ethnicity
* Age between 45-85 years
* Diagnosed to have watchful waiting BPH (Qmax\< 15 ml/sec together with a voided volume of more than 150 mls)
* Not on any concurrent alternative medications for BPH
* Mentally capable to give informed written consent and willing to comply with study requirements

Exclusion Criteria:

* Prefers to have conventional medical or surgical treatment for BPH
* Concurrent treatment for unstable chronic diseases including unstable angina, poorly controlled DM (HbA1c \>7.5), less than 3 months post-MI or frequent exacerbation of COPD (more than 3x in the last year)
* Known to have prostate cancer or kidney and/or liver failure
* Urinary symptoms due to known causes other than BPH including neurogenic bladder, urinary tract infection, bladder cancer, bladder stone, urethral stricture
* Previous history of prostatic surgery
* Illiterate or having difficulty in filling in a patient diary

Primary outcomes:
measure: The primary safety endpoint is tolerability i.e. discontinuation due to an adverse event. The primary efficacy outcome will be an improvement in the urine flow rate by at least 2ml/sec after 12 months treatment when compared to placebo.
timeFrame: 12 months
measure: The secondary efficacy outcome measure will include an improvement in symptoms and quality of life measured in the International Prostate Symptom Score (IPSS) and Sf-36 respectively.
timeFrame: 12 months
Secondary outcomes:
measure: The secondary efficacy outcome measure will include an improvement in symptoms and quality of life measured in IPSS and Sf-36 respectively.
timeFrame: 12 months
Other outcomes:
Locations:
city: Hong Kong
country: Hong Kong
facility: The Chinese University of Hong Kong
Study officials:
References:
citation: Wong WC, Wong EL, Li H, You JH, Ho S, Woo J, Hui E. Isoflavones in treating watchful waiting benign prostate hyperplasia: a double-blinded, randomized controlled trial. J Altern Complement Med. 2012 Jan;18(1):54-60. doi: 10.1089/acm.2010.0077.