title: [Comparison of clinical outcomes of four protocols for frozen-thawed embryo transfer cycle].
abstract: OBJECTIVE
  To compare the clinical outcome of 4 protocols of frozen-thawed embryo transfer cycle to select the optimal endometrial preparation method for frozen-thawed embryos transfer.
  
  
  METHODS
  A retrospective analysis of the 4 clinical protocols was conducted including natural cycle, down-regulated hormone replacement treatment (HRT) cycle, hMG cycle and natural cycle+hCG in endometrial preparation for 419 frozen-thawed embryos transfer cycle, and the clinical pregnancy rate, implantation rate, early abortion rate, ectopic pregnancy rate , ongoing pregnancy rate and delivery rate were compared between the 4 protocols.
  
  
  RESULTS
  There was no significant difference between the 4 groups with different clinical protocols in age, duration of infertility, reason of infertility, number of embryo transferred and endometrial thickness. The 4 protocols differed little in the implantation rate, clinical pregnancy rate, biochemical pregnancy rate, early abortion rate, ectopic pregnancy rate, ongoing pregnancy rate and delivery rate in the four clinical protocols.
  
  
  CONCLUSIONS
  The 4 clinical protocols for frozen-thawed embryos transfer all have favorable clinical outcome, and choice of a specific protocol should be made according to the a comprehensive consideration of the individual conditions of the patient.
authors.affiliation: Department of Obstetrics and Gynecology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.
authors.forename: Shi-ling
authors.initials: SL
authors.lastname: Chen
authors.forename: Jin-xia
authors.initials: JX
authors.lastname: He
authors.forename: Hua-dong
authors.initials: HD
authors.lastname: Song
authors.forename: Shu-zhen
authors.initials: SZ
authors.lastname: Li
authors.forename: Xiao-ning
authors.initials: XN
authors.lastname: Liu
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.forename: Fu-qi
authors.initials: FQ
authors.lastname: Xing
mesh_terms: D000328:Adult; D006063:Chorionic Gonadotropin / Q000627:therapeutic use; D015925:Cryopreservation / Q000379:methods*; D010064:Embryo Implantation; D004624:Embryo Transfer / Q000379:methods*; D004717:Endometrium / Q000187:drug effects; D015914:Estrogen Replacement Therapy; D005260:Female; D012739:Gonadal Steroid Hormones / Q000627:therapeutic use; D007987:Gonadotropin-Releasing Hormone / Q000627:therapeutic use; D006801:Humans; D007247:Infertility, Female / Q000628:therapy; D007986:Luteinizing Hormone / Q000627:therapeutic use; D008875:Middle Aged; D010062:Ovulation Induction / Q000379:methods; D011247:Pregnancy; D011256:Pregnancy Outcome; D018873:Pregnancy Rate; D012189:Retrospective Studies
chemical_list: D006063:Chorionic Gonadotropin; D012739:Gonadal Steroid Hormones; D007987:Gonadotropin-Releasing Hormone; D007986:Luteinizing Hormone