 - Both ER and PgR negative primary tumor. Evidence of distant metastases M1 Neo-adjuvant hormonotherapy. Chronic use of oral anticoagulants such as warfarin or acenocoumarol. Psychiatric disorders preventing proper informed consent. Concomitant malignancies except for adequately treated carcinoma in situ of the uterine cervix or basal squamous cell carcinoma of the skin. 