In view of the absence of data published on the changes of the vitamin and calcium metabolism in patients of a breast cancer receiving adjuvant chemotherapy combined with corticosteroids in antiemetic aiming and a basal calcium vitamin deficiency. A non randomized study evaluating the percentage of change in the vitamin and calcium balance and the occurrence of a hypercalciuria between initiation and the end of the adjuvant chemotherapy seems necessary, both from the scientific point of view, but also to estimate the usefulness of these markers in clinical practice track.