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  • Title: Randomized controlled trial comparing superovulation with letrozole versus recombinant follicle-stimulating hormone combined with intrauterine insemination for couples with unexplained infertility who had failed clomiphene citrate stimulation and intrauterine insemination.
    Author: Gregoriou O, Vlahos NF, Konidaris S, Papadias K, Botsis D, Creatsas GK.
    Journal: Fertil Steril; 2008 Sep; 90(3):678-83. PubMed ID: 17961561.
    Abstract:
    OBJECTIVE: To compare the efficacy of letrozole to recombinant FSH for ovarian stimulation combined with IUI in a group of patients that had failed to conceive after clomiphene citrate (CC) and IUI. DESIGN: Prospective randomized trial with human subjects. SETTING: University-based fertility center. PATIENT(S): Fifty couples with unexplained infertility that failed to conceive after three cycles of CC combined to IUI. INTERVENTION(S): Couples were randomized to undergo superovulation either with letrozole or with recombinant FSH combined to IUI. MAIN OUTCOME MEASURE(S): Clinical pregnancy per cycle of treatment and clinical pregnancy per couple. RESULT(S): Pregnancy rate (PR) per cycle was 8.9% in the letrozole group as compared with 14% in the gonadotropin IUI group. This resulted in a cumulative PR per couple of 24% versus 36% and a take home baby rate of 20% versus 28%. Endometrial thickness was significantly lower in the letrozole group (7.1 +/- 2.3 vs 8.6 +/- 1.8). CONCLUSION(S): Ovarian stimulation with letrozole is associated with acceptable PRs compared with gonadotropin with significant less cost, risks, and patient inconvenience.
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