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Abstract
The
review evaluates the role of vitamin D in carcinogenesis. Based on
ecological studies, the incidence of many cancers has been shown to be
higher in northern countries, suggesting an association with latitude
and solar radiation. Vitamin D produced in skin under the influence of
sun exposure may play a protective role in the process leading to
cancer. Vitamin D deficiency is now recognized as a pandemic, mainly due
to lack of knowledge that sun exposure in moderation is the major
source of vitamin D for most humans. After vitamin D was discovered to
be the necessary element of nourishment to prevent rickets at the
beginning of the twentieth century the theory concerning its role has
evolved. It is now recognized that vitamin D, and particularly its
active form 1.25 (OH)2D, is an important hormone playing a crucial role
in human homeostasis. [1.25(OH)2D3 has been shown to inhibit cancer cell
growth, induce cancer cell maturation, induce apoptosis, and decrease
angiogenesis. Several studies suggested that living at higher
geographical latitudes increased the risk of developing and dying of
colon, prostate, breast and other cancers. People exposed to sunlight
were noted to less likely develop cancer. Several studies evaluated
circulating levels of 25(OH)D and its possible association with cancer.
Case-control studies and laboratory tests have consistently demonstrated
that vitamin D plays an important role in the prevention of breast
cancer. Vitamin D supplementation is a much needed, low cost, effective,
and safe intervention strategy for breast cancer prevention that should
be implemented. It has been shown that vitamin D levels are lower in
ovarian cancer patients. Low 25(OH) D concentration associated with
lower overall survival rate might suggest for the important role of
severe deficiency in more aggressive course of ovarian cancer. Testing
for 25(OH)D in the standard procedure could help to find ovarian cancer
patients with worse prognosis, who would benefit from special attention
and supplementation. Vitamin D3 supplementation in moderate doses
achieving 25(OH)D concentrations of 30-80 ng/ml, can be recommended as
many benefits may be expected, including decreased risk of developing
cancer.
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