The protocol involves measurement of 25 hidroxy vitamin D, gene expression of cytochrome and vitamin D receptor , endoxifen, tamoxifen, exemestane, and other metobolites related to nutrition and endocrine metabolism.
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Hidroxy Vitamin D Concentration
Timeframe: One time after minimum 3 months of tamoxifen, anastrozole or exemestane treatment (endocrine therapy)
Body Composition
Timeframe: One time at enroll with at least 3 months of endocrine therapy