Hysteroscopic Evaluation of Endometrial Changes in Breast Cancer Women with or without Hormone Therapies: Results from a Large Multicenter Cohort Study

ABSTRACT Study objective The primary aim of our study was to investigate the incidence of endometrial pathologies, especially endometrial cancer, in women with breast cancer treated with Tamoxifen (TAM), aromatase inhibitors (AIs) or receiving no treatment (NT). The secondary aim was to identify, in this cohort, ultrasonographic findings that represent robust indications for hysteroscopy and endometrial biopsy, to avoid unnecessary second level diagnostic procedures. Design Multicenter retrospective cohort study (Clinical Trial ID: NCT03898947). Setting Data were collected from different Italian Centers: “Regina Elena” National Cancer Institute of Rome, "Arbor Vitae" Centre of Rome, “Gaetano Martino” University Hospital of Messina, “Villa Sofia-Cervello” Hospital of Palermo. Patients We selected and consecutively included patients with a history of breast cancer who had undergone hysteroscopy for ultrasonographic or clinical indications between January 2007 and December 2016. Intervention Diagnostic hysteroscopy with endometrial biopsy or operative hysteroscopy, when clinically indicated. Measurements and Main Results A higher percentage of patients in the TAM and AIs groups had a normal endometrium compared to those in the NT group, whereas the incidence of endometrial polyps was higher in the NT group than in the others; no significant differences were observed among the three groups for other benign conditions or for pre-malignant and malignant uterine diseases, such as endometrial atypical hyperplasia and adenocarcinoma. Conclusion TAM treatment does not seem to be associated with a higher rate of endometrial cancer in women with breast cancer compared to women treated with AIs or no treatment.