Pharmacology of Adjuvant Hormonotherapy in Breast Cancer

Inclusion Criteria: 1. Patient of more than 18 years old (menopaused or not) 2. Invasive breast cancer non-metastatic locally controlled by surgery with or without radiotherapy. Previous treatment with chemotherapy is allowed including trastuzumab 3. Cancer hormone-expressing ER and / or PR (\> 10% tumor cells in Technical HIC) 4. Having a staging exploring bone, liver, lung and showing no abnormality secondary (for sub-centimeter tumors, the staging is not necessary) 5. WHO \<2 6. Before the initiation of adjuvant hormonal therapy (tamoxifen, anastrozole, letrozole or exemestane) and whatever the approach chosen by the investigator (5 years of tamoxifen, 5 years of anti-aromatase or sequential patterns) 7. signed Consent collected before any specific procedure in the study 8. Patient member in a national insurance scheme. Exclusion Criteria: 1. Patient previously treated for breast cancer receiving hormonal therapy with tamoxifen, anastrozole, letrozole or exemestane regardless of the scheme 2. Metastatic Breast cancer 3. History of another cancer diagnosed within 5 years before or uncontrolled except carcinoma in situ of cervix carcinoma, nonmelanoma skin, breast cancer (in this case, treatment with hormone therapy should be stopped for at least 6 months) 4. Any other medical or psychiatric condition or laboratory abnormality severe acute or chronic making the inclusion of the patient in the study inappropriate in the opinion of the investigator 5. Patient unable to follow procedures, visits, examinations described in the study 6. Pregnant women or nursing mothers can not participate in the study 7. Women of childbearing age must use effective contraception at study entry and up to at least three months after the end of treatment 8. Patient under legal guardianship