A prospective cohort study at a Tertiary University Hospital. From January to December 2018, we enrolled women with the following criteria: abnormal uterine bleeding in post-menopause, endometrial thickening in pre-or post-menopause; tamoxifen usage. Patients underwent office hysteroscopy with a 5-mm continuous-flow hysteroscope and endometrial biopsies were taken using miniaturized instruments. Senior operators had to foresee histopathological diagnosis using a questionnaire. Histopathological examination was conducted to confirm the diagnosis.
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Inclusion Criteria: * abnormal uterine bleeding in post-menopause * ultrasonographic detection of endometrial thickening in pre-menopause * ultrasonographic detection of endometrial thickening in post-menopause * follow-up after Tamoxifen-based therapy regimens Exclusion Criteria: * severe urinary symptoms * history of severe comorbidities (autoimmune disorders, chronic diseases and severe cardiac disease)