title: Letrozole, berberine, or their combination for anovulatory infertility in women with polycystic ovary syndrome: study design of a double-blind randomised controlled trial.
abstract: BACKGROUND
  Letrozole is being used as an alternative to clomiphene citrate in women with polycystic ovary syndrome (PCOS) requiring ovulation induction. Berberine, a major active component of Chinese herbal medicine rhizoma coptidis, has been used to improve insulin resistance to facilitate ovulation induction in women with PCOS but there is no study reporting the live birth or its potential as a complementary treatment to letrozole. We aim to determine the efficacy of letrozole with or without berberine in achieving live births among 660 infertile women with PCOS in Mainland China.
  
  
  METHODS
  This study is a multicentre randomised, double-blind trial. The randomisation scheme is coordinated through the central mechanism and stratified by the participating site. Participants are randomised into one of the three treatment arms: (1) letrozole and berberine, (2) letrozole and berberine placebo, or (3) letrozole placebo and berberine. Berberine is administered three times a day (1.5 g/day) for up to 24 weeks, starting on day 1 after a spontaneous period or a withdrawal bleeding. Either letrozole or letrozole placebo 2.5 mg is given daily from day 3 to day 7 of the first three cycles and the dose is increased to 5 mg/day in the last three cycles, if not pregnant. The primary hypothesis is that the combination of berberine and letrozole results in a significantly higher live birth rate than letrozole or berberine alone.
  
  
  BACKGROUND
  The study was approved by the ethics committee of the First Affiliated Hospital of Heilongjiang University of Chinese Medicine. Study findings will be disseminated through peer-reviewed publications and conference presentations.
  
  
  BACKGROUND
  ClinicalTrials.gov identifier: NCT01116167.
authors.affiliation: Department of Obstetrics and Gynecology, National Key Discipline, Specialty and Clinical Base, Heilongjiang University of Chinese Medicine, Harbin, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Hongying
authors.initials: H
authors.lastname: Kuang
authors.forename: Wenjuan
authors.initials: W
authors.lastname: Shen
authors.forename: Hongli
authors.initials: H
authors.lastname: Ma
authors.forename: Yuehui
authors.initials: Y
authors.lastname: Zhang
authors.forename: Elisabet
authors.initials: E
authors.lastname: Stener-Victorin
authors.forename: Ernest
authors.initials: E
authors.lastname: Hung
authors.forename: Yu
authors.initials: Y
authors.lastname: Ng
authors.forename: Jianping
authors.initials: J
authors.lastname: Liu
authors.forename: Haixue
authors.initials: H
authors.lastname: Kuang
authors.forename: Lihui
authors.initials: L
authors.lastname: Hou
authors.forename: Xiaoke
authors.initials: X
authors.lastname: Wu
keywords: REPRODUCTIVE MEDICINE