Examining Uterine Natural Killer Cells in Patients with Repeated ICSI Failures

Uterine Natural Killer (uNK) Cell Expression in Patients With Repeated ICSI Failures: A Multicenter Cohort Study

Observational Tanta University · NCT04867759

This study is trying to see if the activity of certain immune cells in the uterus affects the chances of getting pregnant for women who have had repeated failures with a fertility treatment called ICSI.

Quick facts

Study typeObservational
Enrollment120 (estimated)
Ages20 Years to 40 Years
SexFemale
SponsorTanta University Academic / other
Locations1 site (Tanta)
Trial IDNCT04867759 on ClinicalTrials.gov

What this trial studies

This observational study investigates the role of uterine natural killer (uNK) cells in patients who have experienced repeated failures with intracytoplasmic sperm injection (ICSI). It involves performing endometrial biopsies on participants to assess the expression of uNK cells, particularly focusing on their activity levels during the menstrual cycle. The study aims to correlate uNK cell activity with endometrial thickness and the likelihood of successful implantation. By understanding the relationship between uNK cells and implantation failure, the study seeks to provide insights into potential interventions for improving ICSI outcomes.

Who should consider this trial

Good fit: Ideal candidates for this study are women aged 20-40 who have experienced more than two failures with IVF or ICSI.

Not a fit: Patients with prior uterine surgery, immunological diseases, or those who have previously been tested for uNK cells may not benefit from this study.

Why it matters

Potential benefit: If successful, this study could lead to improved strategies for managing patients with repeated ICSI failures, potentially increasing their chances of successful pregnancies.

How similar studies have performed: While the role of uNK cells in implantation has been explored, this specific approach in relation to repeated ICSI failures is relatively novel and has not been extensively tested.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Patients with IVF/ICSI failures more than 2 times
* Age 20-40 years

Exclusion Criteria:

* prior uterine surgery
* immunological disease
* previous testing to uNK cells

Where this trial is running

Tanta

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions Repeated Implantation FailureICSI FailureuNatural Killer Cells
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.