Conclusion
Overall, the statistical insignificance of the 12.1 percentage point difference in the live birth rate (40.7% vs. 28.6%) between the GnRH-a group and the controls in AC-FET. However, the improvement of the pregnancy outcome supports the non-inferiority of GnRH-a added during the luteal phase in AC-FET. Our results offered informative references for further analysis and studies. The possible beneficial effect of GnHR-a in FET needs to be confirmed by further larger-scale clinical trials.