Condition category
Nutritional, Metabolic, Endocrine
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims
In vitro fertilisation (IVF) is an assisted reproductive technology (ART) technique to help people with fertility problems to have a baby. Patients undergoing IVF receive various treatments to stimulate the release of multiple eggs from the ovaries. Sometimes a type of medication called gonadotropin-releasing hormone (GnRH) antagonists are used to prevent patients from releasing the eggs too early i.e., before the time of the egg pickup procedure. The GnRH antagonist is routinely given on day five of ovarian stimulation treatment, or can be administered before or after day five. One particular clinical condition in which the use of GnRH antagonists has been reported to be beneficial is in patients with polycystic ovarian syndrome (PCOS), where a sex hormone imbalance leads to the growth of benign masses on the ovaries. In these patients the use of GnRH antagonists reduced the incidence of severe ovarian hyperstimulation syndrome (OHSS), where too many eggs develop in the ovaries, making them very large and painful. The aim of this study is to compare two treatment schedules used in women with PCOS during IVF. Both treatment schedules are used in routine clinical practice. However, the choice between the two is based on the judgment of the treating physician because there are no studies that have looked at whether one schedule is better than the other.

Who can participate?
Women aged 18-40 with PCOS undergoing ART

What does the study involve?
Participants are randomly allocated into one of two groups. One group receives GnRH antagonist
on day one, while the other group receives GnRH antagonist on day five of ovarian stimulation. The embryo implantation rate, pregnancy rate, delivery rate, miscarriage rate, and the incidence of severe OHSS are compared between the two groups.

What are the possible benefits and risks of participating?
There are no direct anticipated benefits from participating in the study. However, participation may help in the advancement of science by finding out which treatment schedule is superior to the other or to find out that the two schedules are similarly successful. There is no specific risk of participating in the study. Both schedules have been used in clinical practice with success. There are other potential risks and complications associated with the clinical practice of ovarian stimulation and IVF. Such risks include, but are not limited to, the risk of anaesthetic, bleeding, which may require further surgery to control, infection, multiple pregnancy, higher incidence of miscarriage and ectopic pregnancy, and higher incidence of congenital malformation (birth defects) and chromosomal (genetic) abnormalities in babies born as a result of IVF. There is also a possible link between the use of fertility medication and ovarian cancer. Patients who use fertility medications are at increased risk of a condition called severe hyperstimulation syndrome, which could result in serious complications such as blood clot formation, kidney failure, fluid in the peritoneal cavity and around the lungs, and ovarian twisting, which would require surgery to correct.

Where is the study run from?
Hurley Medical Center (USA)

When is the study starting and how long is it expected to run for?
January 2006 to December 2009

Who is funding the study?
IVF Michigan, P.C. (USA)

Who is the main contact?
Dr Mostafa Abuzeid

Trial website

Contact information



Primary contact

Dr Mostafa Abuzeid


Contact details

Two Hurley Plaza
Suite 209
United States of America
+ 1 810 262 9714

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

Controlled ovarian hyperstimulation with long versus conventional protocol of gonadotropin-releasing hormone (GnRH) antagonist in women with polycystic ovarian disease (PCOD) undergoing assisted reproduction: a randomized controlled trial


Study hypothesis

The purpose of this study was to test the hypothesis that in women with polycystic ovarian syndrome (PCOS), early initiation of GnRH-ant. (day 1 of ovarian stimulation) is associated with higher implantation rate compared to conventional GnRH-antagonist protocol (starting on day 5 of ovarian stimulation).

Ethics approval

Institutional Review Board at Hurley Medical Center, 31/10/2006, ref: 195632-1

Study design

Single-center physician-blinded prospective randomized trial

Primary study design


Secondary study design

Randomised controlled trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details to request a patient information sheet


Polycystic ovarian syndrome


Controlled ovarian stimulation (COS) for intracytoplasmic sperm aspiration (ICSI) procedures in infertile patients with polycystic ovarian syndrome (PCOS). Two groups were studied.

The study group (group 1) received GnRH- antagonist subcutaneously (SC) starting on the same day on the beginning of COS using SC recombinant follicle stimulating hormone(r-FSH) 150-225 IU daily.

The control group (group 2) received GnRH- antagonist SC starting on treatment day 5 of SC r-FSH (150 -225 IU daily).

The implantation rate, clinical pregnancy rate, delivery rate, miscarriage rate, and the incidence of severe ovarian hyperstimulation syndrome between the two groups were compared.

Intervention type



Not Applicable

Drug names

Recombinant follicle stimulating hormone

Primary outcome measure

Implantation rates evaluated at the end of the study

Secondary outcome measures

1. Clinical pregnancy, delivery, and miscarriage rates
2. The incidence of severe ovarian hyperstimulation syndrome (OHSS)

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Women (age between 18-40 years) with PCOS, undergoing assisted reproductive technology (ART). PCOS was defined according to Rotterdam criteria at least 2 of the following 3 features:
1.1. Oligo and/or anovulation
1.2. Clinical and/or biochemical signs of hyperandrogenism and
1.3. Polycystic ovary on ultrasound scan (The Rotterdam ESHRE/ASRM-sponsored PCOS consensus workshop group 2004)

Participant type


Age group




Target number of participants


Participant exclusion criteria

1. Hypothyroidism
2. Hyperprolactinemia
3. Non-classical form of congenital adrenal hyperplasia
4. Cushing’s syndrome
5. Androgen-secreting tumors

Recruitment start date


Recruitment end date



Countries of recruitment

United States of America

Trial participating centre

Hurley Medical Center
United States of America

Sponsor information


Hurley Medical Center (USA)

Sponsor details

Two Hurley Plaza
Suite 209
United States of America
+ 1 810 262 9714

Sponsor type

Hospital/treatment centre



Funder type

Hospital/treatment centre

Funder name

IVF Michigan, P.C. (USA)

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Not provided at time of registration

Intention to publish date

Participant level data

Not provided at time of registration

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

14/02/2017: Plain English summary added.