Personal FET in RIF Patients According to Histological Dating of Endometrial of Natural/ Hormone Replacement Cycle

Study Overview
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Brief Summary
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At present, the evaluation criterion of endometrial receptivity is controversial. The development of a molecular diagnostic tool, the endometrial receptivity array (ERA) for diagnosis of endometrial receptivity . But use of this test in patients with RIF has shown that the window of implantation (WOI) is displaced in only a quarter of these patients and use of a personalized embryo transfer (pET) on the day designated by ERA improves reproductive performance with higher cost .what is known to the others'population? The morphological changes observed on histology for each specific day after ovulation were described by Noyes and his colleagues in 1950 . An endometrial biopsy that shows a difference of more than 2 days between the histologic dating and actual day after ovulation is considered to be ''out of phase''. But such pET studies according to the Noyes criterion are lacking . The aim of this study is to explore the Personal frozen-thawed embryo transfer in unexplained RIF patients according to the blinded histological dating of endometrial biopsies .

Official Title
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Personal Frozen-thawed Embryo Transfer in Unexplained RIF Patients According to the Blinded Histological Dating of Endometrial Biopsies of Natural/ Hormone Replacement Cycle

Conditions
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Infertility, Female

Intervention / Treatment
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* Procedure: personal embryo transfer


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: The inclusion criteria for RIF group were: •unexplained repeated implantation failure (RIF) which is defined as the absence of a gestational sac on ultrasound at 5 or more weeks after embryo transfer (ET) after 3 embryo transfers with high quality embryos or after the transfer of ≥10 embryos in multiple transfers. The inclusion criteria for control group were: age <35 years; regular menstrual cycles of 24-35 days; baseline follicle- stimulating hormone (FSH) < 9.0 IU/L; endometrial thickness ≥8.0 mm on the day of hCG administration. Exclusion Criteria: uterine abnormalities (double uterus, bicornuate uterus, unicornuate uterus); intrauterine adhesions（moderate - severe）, endometriosis, adenomyosis, untreated hydrosalpinx, uterine fibroids (submucosal fibroids, nonmucosal fibroids >4.0 cm and/or endometrial pressure) history of adverse pregnancy (including spontaneous abortion, stillbirth, and fetal malformation).

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 40 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: RIF group<br>According to the histological dating of endometrium of natural/hormone replacement cycle in control group, to explore the effectiveness of intervention by advanced or delayed personal embryo transfer . The establishment of standard control group: Frozen embryo transfer patients according to the inclusion and exclusion criteria were evaluated for histological dating by endometrial biopsy on 7 days after ovulation/P+7. After routine time transfer in the frozen embryo transfer cycle, the standard of histological dating were determined according to the pregnancy outcome of the FET cycle . pET in RIF patients was delayed one(ovulation +4/P+4, OV/P+4) / two days(OV/P+3) or advanced one day(OV/P+9). Day 5 blastocysts were transferred with this strategy in natural cycles. | Procedure: personal embryo transfer<br>* According to the histological dating of endometrium of natural/hormone replacement cycle in control group, to explore the effectiveness of intervention by advanced or delayed personal embryo transfer . The establishment of standard control group: Frozen embryo transfer patients according to the inclusion and exclusion criteria were evaluated for histological dating by endometrial biopsy on 7 days after ovulation/P+7. After routine time transfer in the frozen embryo transfer cycle, the standard of histological dating were determined according to the pregnancy outcome of the FET cycle . pET in RIF patients was delayed one(ovulation +4/P+4, OV/P+4) / two days(OV/P+3) or advanced one day(OV/P+9). Day 5 blastocysts were transferred with this strategy in natural cycles.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| clinical pregnancy rate | clinical pregnancy rate | at least one intrauterine gestational sac with cardiac action by ultrasound performed 28 days after embryo transfer | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Biochemical pregnancy | Biochemical pregnancy | 14 days after embryo transfer |