ABSTRACT
Recurrent implantation failure (RIF) is a poorly defined clinical scenario marked by failure to achieve pregnancy after multiple embryo transfers. The causes and definitions of implantation failure are heterogeneous, posing limitations on study design as well as the interpretation and application of findings. Recent studies suggest a novel, personalized approach to defining RIF. Here, we review the implantation physiology and definitions of the implantation rate, failure, and RIF.
Subject(s)
Embryo Implantation/physiology , Embryo Transfer/methods , Fertilization in Vitro/methods , Treatment Failure , Embryo Transfer/trends , Endometrium/physiology , Female , Fertilization in Vitro/trends , Humans , Pregnancy , Pregnancy Rate/trends , RecurrenceSubject(s)
Clomiphene , Infertility , Gonadotropins , Humans , Letrozole , Ovulation Induction , Treatment OutcomeABSTRACT
OBJECTIVE: To examine the association between ovarian conservation and oncologic outcome in surgically-treated young women with early-stage, low-grade endometrial cancer. METHODS: This multicenter retrospective study examined women aged <50 with stage I grade 1-2 endometrioid endometrial cancer who underwent primary surgery with hysterectomy from 2000 to 2014 (US cohort nâ¯=â¯1196, and Japan cohort nâ¯=â¯495). Recurrence patterns, survival, and the presence of a metachronous secondary malignancy were assessed based on ovarian conservation versus oophorectomy. RESULTS: During the study period, the ovarian conservation rate significantly increased in the US cohort from 5.4% to 16.4% (Pâ¯=â¯0.020) whereas the rate was unchanged in the Japan cohort (6.3-8.7%, Pâ¯=â¯0.787). In the US cohort, ovarian conservation was not associated with disease-free survival (hazard ratio [HR] 0.829, 95% confidence interval [CI] 0.188-3.663, Pâ¯=â¯0.805), overall survival (HR not estimated, Pâ¯=â¯0.981), or metachronous secondary malignancy (HR 1.787, 95% CI 0.603-5.295, Pâ¯=â¯0.295). In the Japan cohort, ovarian conservation was associated with decreased disease-free survival (HR 5.214, 95% CI 1.557-17.464, Pâ¯=â¯0.007) and an increased risk of a metachronous secondary malignancy, particularly ovarian cancer (HR 7.119, 95% CI 1.349-37.554, Pâ¯=â¯0.021), but was not associated with overall survival (HR not estimated, Pâ¯=â¯0.987). Ovarian recurrence or metachronous secondary ovarian cancer occurred after a median time of 5.9â¯years, and all cases were salvaged. CONCLUSION: Our study suggests that adoption of ovarian conservation in young women with early-stage low-grade endometrial cancer varies by population. Ovarian conservation for young women with early-stage, low-grade endometrial cancer may be potentially associated with increased risks of ovarian recurrence or metachronous secondary ovarian cancer in certain populations; nevertheless, ovarian conservation did not negatively impact overall survival.
