Women´s period comprises different hormonal stages, being one of them the stage for maximum receptivity and proper embryo implantation. This stage is named window of implantation (WOI), and is characterized by a specific molecular pattern than can be assessed by the Endometrial Receptivity Analysis (ERA® test), developed by Igenomix. Determining the WOI allows to schedule a personalized embryo transfer (pET) when the endometrium is most receptive for the implantation.
The main objective of the present study is to improve our knowledge on the endometrial factor in an infertile population with previous implantation failures. To do so, a diagnosis of the endometrial receptivity to determine the WOI (ERA®) and the microbiome (EMMA®) of each participant will be performed, assessing its impact on deferred embryo transfers in terms of reproductive outcomes.
Participants will follow their previously programmed IVF/ICSI treatment and, only when one embryo with no major anomalies is reported by PGT-A (Preimplantation Genetic Testing for Aneuploidies), they will be asked to attend to the specific study visit for endometrial fluid and biopsy samples collection. These samples will be used to determine the patient's WOI (ERA®) and endometrial microbiome (EMMA®). The results of neither of the tests will be disclosed to the patient or the doctor, being only used for the study purpose. After this visit, the patient will follow the pre-established schedule for an embryo transfer and pregnancy assessment.
Who can participate
Age range
18 Years – 41 Years
Sex
FEMALE
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion Criteria:
* Study ICF signature.
* Female age between 18 and 41 years (both included).
* IVF/ICSI (own or donated gametes) patients with ≥1 previous failed euploid/low-range mosaic embryo transfer(s) or ≥2 previous failed transfers with non-tested good quality embryos. (ROPA method is allowed).
* ≥1 PGT-A tested euploid/low-range mosaic blastocyst (day 5/6) available to be transferred (SET or DET according to medical recommendation).
* BMI 18.0 - 30.0 Kg/m2.
* Negative serological tests for HIV, HBV, HCV, RPR.
Exclusion Criteria:
* No HRT in the biopsy and/or the embryo transfer cycle.
* Intrauterine device (IUD) carriers within 3 months before sample collection.
* Surrogate pregnancy (in those countries where it is allowed).
* Adenomyosis or any pathological finding affecting the endometrial cavity such as polyps/sub-mucosal myomas, intramural myomas \> 4 cm, or hydrosalpinx. (Note: Patients are allowed to participate if the pathology is previously operated at least 3 months before the endometrial samples are obtained).
* Recurrent Pregnancy Loss (RPL ≥2 previous intrauterine miscarriages).
* Active endometritis and salpingitis at the moment of the inclusion.
* Endometriosis stage \> I (stages II, III and IV) according to ASRM classification.
* Atrophic endometrium (\< 6 mm) in the ERA® and/or embryo transfer cycle.
* Endometrial receptivity test and/or microbiome test done before ICF signature.
* Preimplantation Genetic Testing for Chromosomal Structural Rearra…
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.