The Effectiveness and Safety of the Prolonged Down-regulation Protocol for Controlled Ovarian Hyperstimulation

January 15, 2019 updated by: Jiang Li, Peking University People's Hospital

The Effectiveness and Safety of the Early Follicular Phase Prolonged Down-regulation Protocol for Controlled Ovarian Hyperstimulation: a Randomized, Paralleled, Controlled, Multicenter Trial

Since the first "tube baby", Louise Brown, was born in the United Kingdom in 1978, many infertile couples have been benefitted from in vitro fertilization and embryo transfer (IVF-ET) and intracytoplasmic sperm injection (ICSI). Although a late starter, China is developing rapidly in ART and playing a more and more important role in the area of reproductive medicine.

In spite of the continuous development in ART, so far, the overall success rate of IVF/ICSI is still hovering around 25-40%. There are many factors influencing the success rate of IVF/ICSI. Among them, an appropriate controlled ovarian hyperstimulation (COH) protocol is directly associated with the number of oocyte retrieved, as well as the number and quality of embryos, which exert an important influence on the success rate of IVF/ICSI. The luteal phase pituitary down-regulation protocol is one of the most widely used COH protocols in clinical practice, particularly in China. Though effective, it may lead to an increased incidence of ovarian hyperstimulation syndrome (OHSS), as well as a negative impact on endometrial receptivity. The coping strategy is to freeze all the embryos and transfer in the next cycle. Though avoiding the above mentioned adverse effects, such strategy increases the time to pregnancy (TTP) and therefore results in certain psychological and economic burdens for infertile couples.

In recent years, some Chinese researches applied the early follicular full-dose down-regulation protocol that is always performed to women with endometriosis to a more general IVF/ICSI population and found a clinical pregnancy rate of 64% in the fresh embryo transfer cycle, much higher than that of the luteal phase down-regulation protocol. Furthermore, since this protocol decrease the risk of progesterone elevation on hCG day, it increases the fresh embryo transfer rate and shortens TTP.

Given most studies regarding the effectiveness and safety of the early follicular phase full-dose down-regulation protocol are retrospective studies, the results may be biased by several confounding factors. Therefore, we would like to conduct a multicenter, randomized controlled trial to compare the pregnancy outcome and safety indicators between the early follicular phase full-dose down-regulation protocol and the luteal phase down-regulation protocol.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Unknown

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Background:

Since the first "tube baby", Louise Brown, was born in the United Kingdom in 1978, many infertile couples have been benefitted from in vitro fertilization and embryo transfer (IVF-ET) and intracytoplasmic sperm injection (ICSI). It is reported that there are over 5 million babies born with the help of assisted reproductive technology (ART). According to the 2015 national data published by Human Fertility and Embryology Authority (HFEA, 48,147 women received 61,726 IVF/ICSI cycles and gave birth to 17,041 newborns. In the United States, 169,602 IVF/ICSI cycles were performed in 2014 and 68,791 tubal babies were born. China has a huge population base, and therefore has a substantial number of infertile couples. Although a late starter, China is developing rapidly in ART and playing a more and more important role in the area of reproductive medicine.

In spite of the continuous development in ART, so far, the overall success rate of IVF/ICSI is still hovering around 25-40%. The live birth rate per stimulated cycle is 25.6% in the UK in 2015, fluctuating from 1.9% in women aged 45 and elder to 32.2% in women younger than 35 years old. The IVF/ICSI success rate in 2014 in the US is similar. In China, according to the data submitted by 115 reproductive medicine centers on the ART data reporting system developed by Chinese Society of Reproductive Medicine, the delivery rate is about 40%. Hence, there is much room for improvement regarding the live birth rate of IVF/ICSI, which is of great significance to infertile couples.

There are many factors influencing the success rate of IVF/ICSI, e.g. the infertile couples' age, the controlled ovarian hyperstimulation (COH) protocol, the quality and number of embryos for transferring, the endometrium and luteal phase support protocol, etc.. Among them, an appropriate COH protocol is directly associated with the number of oocyte retrieved, as well as the number and quality of embryos, which exert an important influence on the success rate of IVF/ICSI. The luteal phase pituitary down-regulation protocol is one of the most widely used COH protocols in clinical practice, particularly in China. In this protocol, gonadotropin releasing hormone agonist (GnRHa) administered in the previous luteal phase induces a state of down regulation of the pituitary gland via competitive occupying and further exhausting the GnRH receptors in the pituitary, which inhibits the endogenous luteinizing hormone (LH) peak and avoid spontaneous ovulation, decreasing the cycle cancellation rate. But the classic down-regulation protocol may lead to an increased incidence of ovarian hyperstimulation syndrome (OHSS), as well as a negative impact on endometrial receptivity due to the progesterone elevation after multiple oocytes development. The coping strategy is to freeze all the embryos and transfer in the next cycle. Though avoiding the above mentioned adverse effects, such strategy increases the time to pregnancy (TTP) and therefore results in certain psychological and economic burdens for infertile couples.

In recent years, some Chinese researches applied the early follicular down-regulation protocol that is always performed to women with endometriosis to a more general IVF/ICSI population and found a clinical pregnancy rate of 64% in the fresh embryo transfer cycle, much higher than that of the luteal phase down-regulation protocol. The possible mechanism is that it may improve the down regulation of LH and the endometrial receptivity, therefore having a better control of LH during COH, increasing the endometrial thickness on hCG day, as well as the embryo implantation rate and clinical pregnancy rate. Furthermore, since this protocol decrease the risk of progesterone elevation on hCG day, it increases the fresh embryo transfer rate and shortens TTP.

Objective:

Given most studies regarding the effectiveness and safety of the early follicular phase down-regulation protocol are retrospective studies, the results may be biased by several confounding factors. Therefore, we would like to conduct a multicenter, randomized controlled trial to compare the pregnancy outcome and safety between the early follicular phase and luteal phase down-regulation protocols.

Study design:

  1. Screening： 1) Evaluation: vital signs, physical examination, laboratory test (routine tests+ AMH+ chromosome) and ultrasound examination (evaluating the ovarian reserve function); 2) Screening: to decide whether the women can be included in the study or not; 3) Collection of basic information (via electronic medical records and questionnaires): demographic characteristics, the history of infertility, menstrual, marriage and childbearing, the past history and surgery history, and the history of adverse environmental exposure;
  2. Inclusion and randomization: After the evaluation, patients met the eligible criteria will be informed, and those who sign the consent form will be included in this study. We will randomly assign women (1:1) to early follicular phase down-regulation group (intervention group) or luteal phase down-regulation group (control group), using a central randomization system with block sizes of 4 to 6 (changing constantly) and setting hospital as a stratification factor.
  3. Blinding: The researchers (physicians, nurses and embryologists) and patients are not blinded due to the nature of both interventions while the data analysts are blinded.
  4. Intervention and control: The treatment period is from the down-regulation day to the day of oocyte retrieval, and the participants receive one of the following treatments:

1) Early follicular phase prolonged down-regulation group (intervention group): Patients have a injection of 3.75mg long-acting GnRHa (Dipherelin®, IPSEN, France) on the 1st-4th day of menstrual cycle as pituitary down-regulation.

2) Luteal phase long down-regulation group (intervention group): Patients have a injection of short-acting GnRHa (Decapeptyl®, Ferring, Germany) 0.1mg per day, 10-12 days before the menstruation as pituitary down-regulation.

5. Embryo transfer and Luteal phase support: Patients will receive luteal phase support with intramuscular progesterone (60mg/day) since the day of oocyte retrieval. On day 3 after oocyte retrieval, two top quality cleavage-stage embryos will be transferred via a catheter under transabdominal ultrasound guidance. The patients will lie in bed for 15 minutes after the procedure. Luteal phase support will be switched to 8% progesterone sustained-releasing vaginal gel (Crinone®, Merck, Switzerland) 90mg and dydrogesterone (Duphaston®, AbbottBiologicals, Netherlands) 20mg per day and continued for at least 2 weeks. For those who get pregnancy, luteal phase support will be continued to 10 weeks of gestation. The dosage adjustment will be determined by physicians of each study site according to their personal experience.

6. Pregnancy evaluation and follow up: All the information will be recorded in our follow-up forms designed specifically for each follow-up visit.

  1. Biochemical determination: 14±4 days after embryo transfer, serum β-hCG will be tested to determine pregnancy.
  2. Clinical pregnancy determination: 28±4 days after embryo transfer, a transvaginal ultrasound scan will be performed to confirm the presence of fetal sac, yolk sac and fetal heart.
  3. Ongoing pregnancy determination: A transvaginal ultrasound scan will be performed at 10-12 weeks of gestation to confirm ongoing pregnancy. The presence of first-trimester pregnancy complications (e.g. OHSS, ectopic pregnancy, miscarriage etc.) will be registered according to the participant's medical record and a telephone follow-up.
  4. 28 weeks of gestation: A telephone follow-up will be conducted to collect the information regarding the second trimester pregnancy complications.
  5. 37 weeks of gestation: A telephone follow-up will be conducted to collect the information regarding the third trimester pregnancy complications.
  6. Delivery information: A telephone follow-up will be made to collect delivery information including gestational age, delivery mode, delivery complications and infant information such as birth weight, any birth defect, etc.
  7. Postpartum information: Postpartum information includes complications of both the mother and the infant, which will be collected 6 weeks after delivery.

For those not receiving a fresh embryo transfer (e.g. due to OHSS), and those not achieving live birth and with surplus cryopreserved embryos, the outcome of frozen-thawed embryo transfer cycles will be followed up and recorded as well.

7. Outcome measures:

1) Main outcome: live birth rate (effective indicator) per stimulated cycle. 2) Secondary outcomes include effective and safety indicators. 8. Biostatistic analysis method and sample size calculation:

  1. Sample size will be calculated based on superiority test: α=0.05, 1-β=0.80. The reported live birth rate is about 30%, while the live birth rate of the prolonged protocol is predicted to be around 40% based on previous retrospective studies. We set the delta value as 6%, and the ratio between groups will be 1:1; therefore, the sample size of each group is 851. Taking into consideration a drop rate of 10%, we expect to ultimately have a total of 1892 enrollees, with 946 participants in each group.

  2. Statistical analysis method:

    1. Statistical description We will adopt descriptive statistical analysis to summarize the participants' demographic characteristics, physical examination, laboratory tests, other health information and the outcome indicators. The continuous variables will be described with means and standard deviation (or median and interquartile range), while the categorical variable will be described with frequency and percentage. The proportion of drop-off cases will be calculated and analyzed.
    2. Comparable analysis It will be used to compare the demographic and other baseline characteristics to make sure the comparability of the two groups. If the continuous variables follow the normal distribution, t test will be performed; if not, the rank sum test or a normal transformation will be performed. For the categorical variables, chi-square test or Fisher's exact test will be performed.
    3. Statistical analysis for the outcome measures Between-group differences for categorical and continuous outcome variables will be assessed by logistic regression and linear regression, respectively.
    4. Safety analysis Adverse events and reaction will be listed and analyzed using the chi-square test.
    5. The analysis for the primary outcome and important outcome measurements will be based on both the intention-to-treat analysis and per-protocol analysis. The results of these two analyses will be compared in the final analysis.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Anticipated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
1892

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 4

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Contact Backup

  • Name: Fumei Gao, MD
  • Phone Number: 86-10-88324436

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

20 years to 35 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

Female

Description

Inclusion Criteria:

  1. Women aged between 20 to 35 years old and with a history of infertility (fail to get pregnant after over one year's regular, unprotected sex), who receive IVF/ICSI for one of the following reasons:

    ① Tubal factor: e.g. peritubal adhesions, tubal obstruction, etc.. Patients with hydrosalpinx can be enrolled after salpingectomy or tubal ligation;

    ② Male factor: e.g. oligospermia, asthenozoospermia, teratozoospermia, etc.;

    ③ Unexplained infertility: patients with a history of infertility more than 1 year but with no specific cause for infertility (ovulation, tubal, endometrial and male factor), or still not get pregnant after the above-mentioned causes being removed.

  2. Women with a normal ovarian reserve according to: ①basal steroid hormone on day 2-4 of menstrual cycle: basal FSH≤10mIU/ml, estradiol (E2) <50pg/ml;②1.5<anti-Müllerian hormone (AMH)<4.0；③8≤antral follicle count (AFC) ≤15;
  3. First IVF/ICSI cycle;
  4. BMI≥18 and ≤25kg/m2;
  5. Informed consent

Exclusion Criteria:

  1. Women with a negative reproductive history, including a history of:

    ① recurrent miscarriage: women with twice and more than twice spontaneous miscarriage, missed abortion, biochemical pregnancies, etc.;

    ② fetal malformation or chromosomal abnormalities;

    ③ intrauterine death.

  2. Women with a history of one side adnexectomy;
  3. Women with a poor ovarian response or diminished ovarian reserve (based on Bologna' criteria);
  4. Women with ovulation dysfunction;
  5. Women with PCOS (based on Rotterdam's criteria);
  6. Women with endometriosis;
  7. Women with the following uterine abnormalities: uterine malformation (unicornuate uterus, uterus bicornis, uterus duplex, mediastinum uterus), adenomyosis, submucosa myoma, intrauterine adhesion;
  8. Chromosomal abnormality for either or both of the couple;
  9. Women with contraindications for ART or pregnancy: uncontrolled diabetes mellitus, cardiac disease, undiagnosed liver and/or renal function, vaginal bleeding, suspected or a past history of cervical cancer, endometrial cancer, breast cancer, and a history of deep venous thrombosis, pulmonary embolism, stroke, etc.;
  10. Women who are enrolled in other clinical trials.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: early follicular phase down-regulation
Patients have a injection of 3.75mg long-acting Triptorelin acetate (Dipherelin®, IPSEN, France) on the 1st-4th day of menstrual cycle. If complete pituitary down-regulation is achieved after 28-42 days, exogenous gonadotropins will be given according to the participants' BMI. The physician will monitor the follicular growth and adjust the dose of exogenous gonadotropins accordingly. When the desired follicle size is reached, human chorionic gonadotropin will be administered. Oocyte retrieval will be performed 36-38 hours after pre-ovulatory hCG injection transvaginally under ultrasound monitoring. Oocyte retrieved will be cultured in vitro for 3-6h before being fertilized via IVF or ICSI. Two top-quality Day 3 cleavage embryos will be transferred 72h after retrieval.
Drug: Triptorelin acetate
Achieve pituitary down regulation with triptorelin acetate and start controlled ovarian stimulation after complete pituitary down regulation
Other Names:
  • recombinant follicular stimulating hormone (rFSH)
  • recombinant luteinizing hormone (rLH)
  • urinanry human postmenopausal gonadotropin (HMG)
Active Comparator: luteal phase down-regulation
Patients have a injection 0.1mg short-acting Triptorelin acetate (Decapeptyl®, Ferring, Germany) every day, 10-12 days before the next menstrual cycle. If complete pituitary down-regulation is achieved after 14-21 days, exogenous gonadotropins will be given according to the participants' BMI. The physician will monitor the follicular growth and the serum hormone level and adjust the dose of exogenous gonadotropins accordingly. When the desired follicle size is reached, human chorionic gonadotropin will be administered. Oocyte retrieval will be performed 36-38 hours later under ultrasound monitoring. Oocyte retrieved will be cultured in vitro for 3-6h before being fertilized via IVF or ICSI. Two top-quality Day 3 cleavage embryos will be transferred 72h after retrieval.
Drug: Triptorelin acetate
Achieve pituitary down regulation with triptorelin acetate and start controlled ovarian stimulation after complete pituitary down regulation
Other Names:
  • recombinant follicular stimulating hormone (rFSH)
  • recombinant luteinizing hormone (rLH)
  • urinanry human postmenopausal gonadotropin (HMG)

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
live birth rate per transferred cycle
Time Frame: 28 weeks of gestation
the number of live births (after 28 gestational week) divided by the number of transferred fresh cycles ×100%;
28 weeks of gestation

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
live birth rate per stimulated cycle
Time Frame: 28 gestational week
the number of live births (after 28 gestational week) divided by the number of all patients who started COH×100%
28 gestational week
biochemical pregnancy rate per stimulated cycle
Time Frame: 12-15 days after embryo transfer
the number of patients with a serum beta hCG of at least 10mIU/ml divided by the number of all patients who started COH ×100%
12-15 days after embryo transfer
clinical pregnancy rate per stimulated cycle
Time Frame: 28-30 days after embryo transfer
the number of patients with a intrauterine gestational sac divided by the number of all patients who started COH×100%
28-30 days after embryo transfer
ongoing pregnancy rate per stimulated cycle
Time Frame: 10-12 weeks of gestation
the number of patients with a viable intrauterine pregnancy divided by the number of all patients who started COH×100%
10-12 weeks of gestation
biochemical pregnancy rate per transferred cycle
Time Frame: 12-15 days after embryo transfer
the number of patients with a serum beta hCG of at least 10mIU/ml divided by the number of transferred fresh cycles ×100%
12-15 days after embryo transfer
clinical pregnancy rate per transferred cycle
Time Frame: 28-30 days after embryo transfer
the number of patients with a intrauterine gestational sac divided by the number of transferred cycles×100%
28-30 days after embryo transfer
ongoing pregnancy rate per transferred cycle
Time Frame: 10-12 weeks of gestation
the number of patients with a viable intrauterine pregnancy divided by the number of transferred fresh cycles×100%
10-12 weeks of gestation
pregnancy loss rate
Time Frame: till 28 weeks of gestation
the number of miscarriage and intrauterine fetal death cases divided by the number of participants with clinical pregnancy
till 28 weeks of gestation

Other Outcome Measures

Other Outcome Measures

For clinical trials, a planned measurement described in the protocol that is used to determine the effect of an intervention/treatment on participants. For observational studies, a measurement or observation that is used to describe patterns of diseases or traits, or associations with exposures, risk factors, or treatment. Types of outcome measures include primary outcome measure and secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
the incidence of moderate to severe OHSS
Time Frame: since oocyte retrieval to 13 weeks gestation
the number of severe OHSS cases divided by the number of participants receiving oocyte retrieval
since oocyte retrieval to 13 weeks gestation
pregnancy complications
Time Frame: since embryo transfer to delivery (during pregnancy)
all the complications occurred during pregnancy, e.g. preeclampsia, gestational diabetes, etc.
since embryo transfer to delivery (during pregnancy)
adverse fetal outcomes
Time Frame: 1 month after delivery
all the recorded adverse fetal outcomes, e.g. fetal malformation etc
1 month after delivery
neonatal birth weight
Time Frame: at delivery
birth weigh of the neonate at delivery
at delivery

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Peking University People's Hospital

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Peking University First Hospital
The Second Hospital of Hebei Medical University
West China Hospital
The First Affiliated Hospital of Zhengzhou University
Henan Provincial People's Hospital
Second Affiliated Hospital of Zhengzhou University
Second Affiliated Hospital of Wenzhou Medical University
First Affiliated Hospital of Wenzhou Medical University
First Affiliated Hospital of Guangxi Medical University
Shanxi Provincial Maternity and Children's Hospital
Jiangxi Maternal and Child Health Hospital
Guangxi Maternal and Child Health Hospital
Yinchuan Municipal Maternal and Child Health Hospital
Xinjiang Jiayin Hospital

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Huan Shen, MD,phD, Peking University
  • Principal Investigator: Li Jiang, MD,MPH, Peking University

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

  • Moher D, Hopewell S, Schulz KF, Montori V, Gotzsche PC, Devereaux PJ, Elbourne D, Egger M, Altman DG; Consolidated Standards of Reporting Trials Group. CONSORT 2010 Explanation and Elaboration: Updated guidelines for reporting parallel group randomised trials. J Clin Epidemiol. 2010 Aug;63(8):e1-37. doi: 10.1016/j.jclinepi.2010.03.004. Epub 2010 Mar 25. Erratum In: J Clin Epidemiol. 2012 Mar;65(3):351.
  • The United Kingdom national data. Human Fertility and Embryology Authority. 2015
  • The United States national assisted reproductive technology(ART) data. Centers for Disease Control and Prevention.2015
  • Chinese Reproductive Medicine Society national assisted reproductive technology (ART) data. 2015
  • L Hu, Y Sun. The impact of various controlled ovarian hyperstimulation (COS) protocols on the outcome of in vitro fertilization and embryo transfer (IVF-ET). Journal of Practical Obstetrics and Gynecology. 2014;30(10);723-725.
  • Y Hu, T Ding, Y Zhao, Q Wu. The comparison of the birth outcome of in vitro fertilization and embryo transfer (IVF-ET) after two different down-regulation protocols. Maternal and Child Health Care of China.2017;32(4):808-810.
  • D Xu, Q Wu. The comparison of the application of ultra-long down-regulation protocol and antagonist protocol in in vitro fertilization and embryo transfer (IVF-ET). Jiangxi Medical Journal. 2015;50(1):13-15.
  • Q Su, Q Wu, L Tian, Y Li. The clinical analysis of different controlled ovarian hyperstimulation (COS) protocols in in vitro fertilization and embryo transfer (IVF-ET). Jiangxi Medical Journal. 2014;49(8):723-725.
  • Y Li, Q Wu, Y Yi. The impact of the follicular phase ultra-long long down-regulation protocol on PCOS patients' outcome after in vitro fertilization and embryo transfer (IVF-ET). Jiangxi Medical Journal. 2014;49(2):117-120.
  • L Nie, Q Wu, Y Zhang, J Chen. The analysis of the application of the follicular phase ultra-long down-regulation protocol in patients with fine ovarian reserve but a failed previous in vitro fertilization (IVF)/ intracytoplasmic sperm injection (ICSI) and embryo transfer. Progress in Obstetrics and Gynecology. 2011;20(6):470-472.
  • F Gong, K Luo, G Lu. The effectiveness of the modified ultra-long down-regulation protocol in PCOS patients receiving in vitro fertilization and embryo transfer (IVF-ET). Basic and Clinical Medicine. 2010，30(9)：984-987.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Anticipated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
February 1, 2019

Primary Completion (Anticipated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
September 1, 2020

Study Completion (Anticipated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 31, 2020

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
January 15, 2019

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 15, 2019

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
January 18, 2019

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
January 18, 2019

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 15, 2019

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
January 1, 2019

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • prolonged down regulation

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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