Provision of Informed Consent

Resectable breast cancer patients, with histological confirmation

Patients eligible to receive hormonal adjuvant treatment with Anastrozole

They are allowed patients treated with adjuvant chemo or radiotherapy concurrently

Patients previously treated with Tamoxifen that had to withdraw treatment due to other reason than endometrial changes are allowed

Postmenopausal patients(aged 50 years or over/ without menses in the last months/ FSH level \>40UI/L / women under 50 years with FSH levels\>40UI/L).

Women showing progesterone and/or estrogen receptors positive.

Assessment of Endometrial Changes in Postmenopausal Women With Breast Cancer in Adjuvant Treatment With Anastrozole