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JOURNAL ARTICLE

Successful treatment with intrauterine delivery of dexamethasone for repeated implantation failure

Tao Zhang, Chunyu Huang, Yan Du, Ruochun Lian, Meilan Mo, Yong Zeng, Gil Mor
American Journal of Reproductive Immunology: AJRI 2017, 78 (6)
28921750

PROBLEM: Effective therapy for endometrial receptivity of patients with repeated embryo implantation failure (RIF) is far undeveloped. Whether intrauterine perfusion of dexamethasone (DXM), local administration of drugs with less systematic side-effects, benefit for embryo implantation by suppressing uterine NK (uNK) cells to improve endometrial receptivity remains unknown.

METHOD OF STUDY: Women with RIF were analyzed for the correlation between the percentage of uNK cells during implantation window and following clinical pregnancy rate to determine the appropriate range of uNK for embryo implantation. Women with RIF and extremely increased uNK cells were treated with transvaginal intrauterine perfusion of DXM. Quantification of uNK cells before and after this treatment was analyzed by immunohistochemistry staining for understanding potential underlying mechanism. Pregnancy outcome was evaluated for the efficiency and safety of this novel therapy.

RESULTS: The clinical pregnancy rate was decreased if the percentage of uNK cells was higher than the 75th percentile (18.06%), which was considered as the cutoff value for increased uNK cells. All eight patients with increased uNK cells responded to DXM-induced decrease on uNK cells number, and seven got clinical pregnancy. Three delivered with a healthy baby at term without any pregnancy complication and three achieved an ongoing pregnancy, but one suffered from early miscarriage.

CONCLUSION: We report for the first time the beneficial effect of intrauterine perfusion of DXM for patients with RIF characterized by high number of uNK cells. The potential mechanism is downregulation of the proportion of uNK cells, which may improve endometrial receptivity and enhance embryo implantation.

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