1.*Many studies have found solar ultraviolet-B (UVB) vitamin D associated with reduced risk of breast, colon, and rectal cancer.
2.*A randomized controlled trial with 1100 IU/day vitamin D3 plus 1450 mg/day calcium found a 77% reduction in all-cancer incidence.
3.*Geographical studies have found reduced risk in mortality rates for 15-20 types of cancer in regions of higher solar UVB doses.
4.*Observational studies found risk of breast, colon, and rectal cancer falls as vitamin D blood levels rise to over 40 ng/mL (100 nmol/L).
5.*Mechanisms have been proposed to explain how vitamin D acts to reduce the risk of cancer from starting, growing, and spreading.
6.*Those who develop nonmelanoma skin cancer may have produced enough vitamin D to reduce their risk of internal cancers.
7.*Those with higher vitamin D blood levels at time of cancer diagnosis had nearly twice the survival rate of those with the lowest levels.
8.*African-Americans have an increased risk of cancer in part due to lower vitamin D blood levels because of darker skin.
9.*Higher UVB exposure early in life has been found associated with reduced risk of breast and prostate cancer.
10.*Those diagnosed with breast, colon and prostate cancer in summer in Norway had higher survival rates than those diagnosed in winter.
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