This site became the new on June 19th. Learn more.
Show more Menu IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu IMPORTANT: Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu
Give us feedback

Metformin in Infertile PCOS Patients

This study is currently recruiting participants.
See Contacts and Locations
Verified December 2015 by Stefano Palomba, University Magna Graecia
Information provided by (Responsible Party):
Stefano Palomba, University Magna Graecia Identifier:
First received: July 12, 2007
Last updated: December 1, 2015
Last verified: December 2015

Metformin, an oral biguanide administrated for treating type-2 diabetes mellitus, is a safe and effective drug recently experimented also in patients with polycystic ovary syndrome (PCOS). The administration of metformin induces ovulatory cycles in CC-resistant or -nonresistant patients with PCOS, and improves the ovulation rate as an additional treatment in women who received CC.

To date, it is unknown the best protocol for metformin administration. In particular, it is not known how long patients who ovulate under metformin should continue treatment before switching to second-line ovulation induction therapy. In this regard, in a recent study by the Kaplan-Meier survival analysis we demonstrated that the first pregnancy occurred late after metformin with an estimated median of seven months.

Based on these considerations, the aim of the present study will be to evaluate the clinical efficacy of metformin according to its duration of administration in infertile PCOS patients ovulating under treatment.

Condition Intervention Phase
Polycystic Ovary Syndrome Drug: Metformin Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Efficacy of Long- Versus Short-term Metformin Protocol in Infertile Anovulatory PCOS Patients

Resource links provided by NLM:

Further study details as provided by Stefano Palomba, University Magna Graecia:

Primary Outcome Measures:
  • Pregnancy rate [ Time Frame: 12 months ]

Secondary Outcome Measures:
  • Ovulation rate Abortion rate Live-birth rate Adverse events [ Time Frame: 21 months ]

Estimated Enrollment: 20
Study Start Date: April 2012
Estimated Study Completion Date: December 2016
Estimated Primary Completion Date: June 2016 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Group A
Short protocol
Drug: Metformin
Active Comparator: Group B
Long protocol
Drug: Metformin

Detailed Description:

Infertile PCOS patients having three ovulatory cycles under metformin, administered using tailored protocol, will be enrolled and randomized in two groups (groups A and B). Patients of group A will continue metformin administration for further three cycles followed by six months of progestogens cyclically administered, whereas patients of group B will continue metformin therapy for further nine cycles.

All patients eligible will undergo baseline assessment consisting of anthropometric, hormonal, and ultrasonographic evaluations. During the study, the clinical and reproductive outcomes, and the adverse experience will be evaluated in each patient.

Data will be analyzed using the intention-to-treat principle and a P value of 0.05 or less will be considered significant. Continuous variables will be analyzed with the unpaired t test and general linear model for repeated measures analysis with Bonferroni test for the post-hoc analysis as required. For categorical variables, the Pearson chi-square and Fisher's exact tests will be used. Cumulative pregnancy rate, our primary end-point, will be calculated by the Kaplan-Maier method, and the differences between the two groups will be assessed with the log-rank test. Cox proportional-hazards model will be used to calculate the hazard ratio for new pregnancy in both groups.


Ages Eligible for Study:   18 Years to 35 Years   (Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Polycystic ovary syndrome (using NIH criteria)
  • Anovulatory infertility (using WHO criteria)
  • Ovulatory cycles under metformin (three cycles)

Exclusion Criteria:

  • Age <18 or >35 years
  • Severe obesity (BMI >35)
  • Neoplastic, metabolic, hepatic, and cardiovascular disorders or other concurrent medical illnesses
  • Hypothyroidism, hyperprolactinemia, Cushing's syndrome, and non-classical congenital adrenal hyperplasia
  • Current or previous (within the last six months) use of oral contraceptives, glucocorticoids, antiandrogens, antidiabetic and anti-obesity drugs or other hormonal drugsPrevious use of ovulation induction agents
  • Intention to start a diet or a specific program of physical activity
  • Organic pelvic diseases
  • Previous pelvic surgery
  • Suspected peritoneal factor infertility
  • Tubal or male factor infertility or sub-fertility
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00501904

Contact: Stefano Palomba, MD +39-0961-883234

Pugliese Hospital Recruiting
Catanzaro, Catanzaro, CZ, Italy, Italy, 88100
Contact: Ingrid Tomaino, MD    +39-0961965097   
Principal Investigator: Stefano Palomba, MD         
Sponsors and Collaborators
University Magna Graecia
Principal Investigator: Stefano Palomba, MD Department of Obstetrics & Gynecology, University "Magna Graecia" of Catanzaro
Principal Investigator: Francesco Orio, MD Department of Endocrinology, University "Federico II" of Naples
Principal Investigator: Achille Tolino, MD Department of Obstetrics & Gynecology, University "Federico II" of Naples
  More Information

Responsible Party: Stefano Palomba, Associate Professor, University Magna Graecia Identifier: NCT00501904     History of Changes
Other Study ID Numbers: 05/2006b
Study First Received: July 12, 2007
Last Updated: December 1, 2015

Keywords provided by Stefano Palomba, University Magna Graecia:

Additional relevant MeSH terms:
Ovarian Diseases
Polycystic Ovary Syndrome
Ovarian Cysts
Adnexal Diseases
Genital Diseases, Female
Gonadal Disorders
Endocrine System Diseases
Hypoglycemic Agents
Physiological Effects of Drugs processed this record on September 19, 2017