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There is some evidence that letrozole can improve the rate of live births and the rate of pregnancy rate for people who experience anovulatory PCOS, and this treatment may be more effective than SERMs. [63] There is high quality evidence that the rate of people developing ovarian hyperstimulation syndrome is similar between SERMs and letrozole ...
Letrozole, sold under the brand name Femara among others, is an aromatase inhibitor medication that is used in the treatment of breast cancer for post-menopausal women. [ 1 ] It was patented in 1986 and approved for medical use in 1996. [ 4 ]
The Fertility Clinic Success Rate and Certification Act (FCSRCA) of 1992 are United States regulatory requirements that mandate all assisted reproductive technology (ART) clinics report pregnancy success rates data to the Centers for Disease Control and Prevention (CDC) in a standardized manner and for the CDC to publish pregnancy success rates .
Pregnancy rate is the success rate for getting pregnant.It is the percentage of all attempts that leads to pregnancy, with attempts generally referring to menstrual cycles where insemination or any artificial equivalent is used, which may be simple artificial insemination (AI) or AI with additional in vitro fertilization (IVF).
As a result of the 1992 Fertility Clinic Success Rate and Certification Act, the CDC is required to publish the annual ART success rates at U.S. fertility clinics. [29] Assisted reproductive technology procedures performed in the U.S. has over than doubled over the last 10 years, with 140,000 procedures in 2006, [ 30 ] resulting in 55,000 births.
A woman whose menstrual cycles ranged in length from 30 to 36 days would be estimated to be infertile for the first 11 days of her cycle (30-19=11), to be fertile on days 12–25, and to resume infertility on day 26 (36-10=26). When used to avoid pregnancy, such fertility awareness-based methods have a typical-use failure rate of 25% per year. [18]
Aromatase inhibitors are a common fertility treatment to treat women with PCOS. A meta-analysis analyzing live birth rates for women with PCOS treated with clomiphene compared to letrozole found that letrozole resulted in higher live birth rates. [11] However, ovulation induction remains an off-label indication, which affects use.
Letrozole is an aromatase inhibitor that prevents estrogen synthesis and encourages ovulation. Recent studies suggest the use of letrozole before misoprostol or mifepristone for initiation of medical abortion can enhance treatment efficacy and reduce the need for surgical interventions. [72]