Tredway D, Schertz JC, Bock D, Hemsey G, Diamond MP. Anastrozole single-dose protocol in women with oligo- or anovulatory infertility: results of a randomized phase II dose-response study.
Fertil Steril 2011;
95:1725-9.e1-8. [PMID:
21316048 DOI:
10.1016/j.fertnstert.2010.11.068]
[Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 11/22/2010] [Accepted: 11/23/2010] [Indexed: 11/29/2022]
Abstract
OBJECTIVE
To compare the effects of anastrozole and clomiphene citrate (CC) on follicular development and ovulation in infertile women with ovulatory dysfunction.
DESIGN
Phase II, prospective, randomized, assessor-blind, multicenter, dose-finding, noninferiority study.
SETTING
Outpatient.
PATIENT(S)
Infertile women with ovulatory dysfunction, aged 18-35 years, and body mass index <35 kg/m(2).
INTERVENTION(S)
Single-dose anastrozole at 5 mg (n = 39), 10 mg (n = 39), 20 mg (n = 39), or 30 mg (n = 38) or a 5-day course of CC at 50 mg/d (n = 39) as starting doses.
MAIN OUTCOME MEASURE(S)
The primary endpoint was the ovulation rate in the first treatment cycle (cycle 1). Ovulation was defined as a midluteal phase serum P level ≥ 10 ng/mL or clinical pregnancy.
RESULT(S)
In cycle 1 the ovulation rates for a single dose of anastrozole at 5, 10, 20, and 30 mg were 46.2%, 41.0%, 23.1%, and 28.9%, respectively, whereas that for CC at 50 mg/d was 61.5%. Among women with fewer than six menses per year, the cumulative ovulation rates over three cycles were comparable in the anastrozole 5 mg (52.4%) and CC 50 mg/d (42.3%) groups.
CONCLUSION(S)
In terms of ovulation rates in cycle 1, single-dose anastrozole at 5, 10, 20, and 30 mg was not as effective as CC at 50 mg/d for 5 days (noninferiority was not shown).
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