Ecological studies of ultraviolet B, vitamin D and cancer since 2000.
Grant WB, Mohr SB.
Ann Epidemiol. 2009 Jul;19(7):446-54. Epub 2009 Mar 9.
PMID: 19269856
CONCLUSION: These findings provide strong evidence that vitamin D status plays an important role in controlling the outcome of cancer. Support for the UVB-vitamin D-cancer theory is now scientifically strong enough to warrant use of vitamin D in cancer prevention, and as a component of treatment. More research studies would help to explore whether there are benefits beyond the substantial effects that have been observed.