Conservatively treated endometrial intraepithelial neoplasia/cancer: Risk of intrauterine synechiae.

INTRODUCTION: To determine whether progestin type or number of dilation and curettage procedures (D&Cs) were associated with intrauterine synechiae (IS) or pregnancy outcomes in patients conservatively treated for endometrial intraepithelial neoplasia (EIN) or endometrial cancer (EC). MATERIALS AND METHODS: We evaluated patients conservatively treated for EIN or EC from 2000 to 2017 at an academic center. IS were identified hysteroscopically. We calculated proportions for categorical variables and tested associations between D&C number, progestin, and pregnancy outcomes using Pearson chi-squared and Fisher's exact tests. A post-hoc power analysis indicated sufficient power to detect livebirth. RESULTS: We analyzed 54 patients, 15 with EIN (28 %) and 39 with EC (72 %), with a mean age of 34 ± 1.2 years. Progestin treatment types included megestrol acetate (MA) (n = 24), MA with levonorgestrel intrauterine device (LngIUD) (n = 10), MA followed by LngIUD (n = 3), and LngIUD alone (n = 6). Mean number of D&Cs was 3.9 ± 0.9. Overall, 53 subjects underwent hysteroscopy; 10 (19 %) had IS. When D&Cs were grouped into 0-2, 3-4 and ≥5, each increase in D&C group had a 2.9 higher odds of IS (OR: 2.91, p = 0.04, CI: 1.05-10.02). LngIUD was associated with a nonsignificant 46 % decrease in the odds of IS (OR: 0.54, p = 0.66, CI: 0.08-2.87). Twenty-two women attempted pregnancy; 14 women achieved a total of 20 pregnancies and 9 women had total of 15 livebirths (41 % livebirth rate). The number of D&Cs and progestin treatment type were not associated with pregnancy outcomes. DISCUSSION: Among 54 patients conservatively treated for EC/EIN, nearly 20 % developed IS. However, hysteroscopic and/or fertility treatments may improve pregnancy outcomes.