title: An open-label study of the effects of a 24-day regimen of gestodene 60 microg/ethinylestradiol 15 microg on endometrial histological findings in healthy women.
abstract: OBJECTIVE
  This open-label, non-comparative study was conducted at a single center to evaluate the effects on the endometrium of a 24-day regimen of a combined oral contraceptive containing gestodene (GTD) 60 microg and ethinylestradiol (EE) 15 microg.
  
  
  METHODS
  Healthy parous women who were > or = 18 years old and had had regular menstrual cycles for the prior 3 months were randomly assigned to one of two groups. Subjects in group A underwent endometrial biopsies during the late luteal phase of the pretreatment cycle and between days 15 and 24 of cycle 6. Subjects in group B had biopsies between days 15 and 24 of cycle 3 and during the late luteal phase of the post-treatment cycle. GTD 60 microg/EE 15 microg was taken for the first 24 days of a 28-day cycle, followed by placebo pills for 4 days, for a total of six cycles.
  
  
  RESULTS
  Data from 27 women were included in the analyses. Eleven of the 13 evaluable baseline biopsies were classified as secretory. Three of nine subjects with evaluable biopsies at cycle 3 and four of nine subjects with evaluable biopsies at cycle 6 had an atrophic endometrium. Post-treatment biopsies showed a typical secretory endometrium in seven of 11 subjects with evaluable biopsies.
  
  
  CONCLUSIONS
  The results of this study show that the 24-day regimen of GTD 60 microg/EE 15 microg produced effective endometrial suppression.
authors.affiliation: Bosch Medicentrum, Groot Ziekengasthuis, Den Bosch, The Netherlands.
authors.forename: H P
authors.initials: HP
authors.lastname: Oosterbaan
mesh_terms: D000328:Adult; D003277:Contraceptives, Oral, Combined / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology*; D003280:Contraceptives, Oral, Synthetic / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology; D004334:Drug Administration Schedule; D004717:Endometrium / Q000187:drug effects*; D004967:Estrogens / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology*; D004997:Ethinyl Estradiol / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology*; D005260:Female; D006801:Humans; D008597:Menstrual Cycle / Q000187:drug effects; D009652:Norpregnenes / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D003277:Contraceptives, Oral, Combined; D003280:Contraceptives, Oral, Synthetic; D004967:Estrogens; D009652:Norpregnenes; C033273:Gestodene; D004997:Ethinyl Estradiol