Objective: To evaluate the efficacy of Letrozole in induction of ovulation in cases of CC-resistant PCOS and to
compare between Letrozole responders and non-responders.
Design: Prospective trial in infertility patients treated with CC
Setting: Benha University Hospital Clinic, Egypt.
Patient(s): Forty-four infertile women with anovulatory PCOS who failed to ovulate with CC.
Intervention(s): Letrozole was given in a dose of 2.5 mg/day from day 3 to day 7 of the menstrual cycle. When the
dominant follicle reached a diameter > 18 mm, HCG 10.000 U was given and timed intercourse was advised.
Main outcome measure(s): Occurrence of ovulation, endomertial thickness, cervical score & pregnancy rate
Results: On the day of HCG administration, the mean number of follicles > 18mm was 1.21, the mean endometrial
thickness was 10.2 mm and cervical mucus score was 11.42. Ovulation occurred in 24 cases (54.6%) and pregnancy
in 6 cases (25%). There was no significant difference between Letrozole responders and non-responders as regards
the age, period of infertility, BMI, waist circumference, LH, FS H or LH/FSH ratio.