Vitamin D Supplementation to Correct the Vitamin D Deficiency for Breast Cancer

Inclusion Criteria: * Breast adenocarcinoma should receive 6 cycles of adjuvant chemotherapy * Women ≥ 18 years old (no age limit) * Performance status :0 or 1 * Patients must be affiliated to a Social Security System * Signed informed consent obtained before any study specific procedures. * Vitamin D deficiency confirmed ( vitamin D result must be \< at 30 ng/ml) Exclusion Criteria: * Metastatic disease * Patients with previous or concomitant other (not breast cancer) malignancy within the past 5 years EXCEPT adequately treated basal or squamous cell carcinoma of the skin or in situ carcinoma of the cervix. Patients who have had a previous other malignancy must have been disease free for at least five years * calcium or colecalciferol contraindications (vitamin D hypersensitivity - disease or an other condition result in hypercalcaemia or hypercalciuria -Calcic lithiasis- high vitamin D level) * Presence of the following diseases in the last 3 years : endocrinal disease, A phosphor calcic disorder treated by vitamin D supplementation at 1000 UI/day or more (this patient who have received a dose \< 1000 UI/day, will be included after have to stop Vitamin D at least 48 hours ) - Osteopenia or osteoporosis confirmed treated * Concomittant treatment with an other experimental product * Pregnant or breastfeeding women * Legal incapacity or physical, psychological or mental status interfering with the patient's ability to sign the informed consent or to terminate the study.