Abstract
Introduction Multiple studies have been performed to evaluate the efficiencies of various endometrial preparation protocols. However, to date, the most appropriate method of endometrial preparation for frozen-thawed embryo transfer (FET) remains debated. To our knowledge, there are no studies comparing FET cycle endometrial preparation protocol for PGT patients, and this study is the first study to compare FET cycle endometrial preparation protocols for PGT patients. Material & methods This retrospective analysis included 2398 FET cycles for 1497 preimplantation genetic testing (PGT) patients with regular menstrual cycles who underwent frozen-thawed single blastocyst transfer from January 2014 to December 2017. The patients were divided into two groups according to the method of endometrial preparation for FET: 586 cycles were natural cycles(NC), and 1812 cycles were hormone replacement treatment (HRT). Reproduction-related clinical outcomes of the two groups were compared. Results The NC group showed a higher clinical pregnancy rate (54.78% vs 51.66%, P=0.188) and live birth rate (45.22% vs 43.21%, P=0.394) than did the HRT group, but these differences were not statistically significant. Moreover, endometrial thickness was significantly greater in the NC group (9.91±2.05 mm vs 8.95±1.53 mm, P Conclusion Our study shows a trend towards higher pregnancy rate and live birth rate for NC compared to HRT. Large randomized controlled trials are warranted to confirm this trend. Additionally, NC is safer than HRT, avoiding ectopic pregnancy and adverse obstetric outcomes.
Published Version
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