Abstract
Vitamin D may be involved in the control of proliferation, differentiation and apoptosis of breast cells. Evidences suggest that the vitamin D pathway is deregulated in women with breast cancer, as detected by lower 25(OH)D3 or 1,25(OH)2D3 serum concentration as compared with women without breast cancer, of CYP24A1 gene amplification (that codes the enzyme 24 hydroxilase, which reduces ti…