Cancer, Vitamin D, Sunlight

Well here is a quandary.
In the last entry I talked about Vitamin D.
And now they are studying the link between sunlight causing or maybe preventing certain cancers and diseases.
Of course radiation causes cancer, but it can also be used to treat cancer.

"Since vitamin D has been shown to play a protective role in a number of internal cancers and possibly a range of other diseases, it is important to study the relative risks to determine whether advice to avoid sun exposure may be causing more harm than good in some populations," Setlow warned.
http://www.guardian.co.uk/science/2009/feb/08/vitamin-d-sun-health

And here's another article:
Doesn't sunlight cause cancer?
Yes, long-term exposure to ultraviolet radiation from the sun (UVA and UVB) has been shown to increase the risk of skin cancer. This is why it is recommended that we wear sunscreen and sun-protective clothing during the summer months.

How can sunlight also protect against cancer?
The answer lies in a vitamin that may play a role in controlling the production of cells - vitamin D. Vitamin D is manfactured in the skin when it is exposed to sunlight and it is this vitamin that may have a protective effect against certain cancers by preventing the overproduction of cells.
http://www.bupa.co.uk/health_information/html/health_news/261103vitd.html

Grape-Seed Extract Kills Leukemia Cells in Lab

And here is another green light for Grape-Seed Extract.
More and more info like this comes in every week.
And it's good that researchers are taking it seriously.

Grape-Seed Extract Kills Leukemia Cells in Lab
An extract from grape seeds forces laboratory leukemia cells to commit cell suicide, according to researchers from the University of Kentucky. They found that within 24 hours, 76 percent of leukemia cells had died after being exposed to the extract.
The investigators, who report their findings in the January 1, 2009, issue of Clinical Cancer Research, a journal of the American Association for Cancer Research, also teased apart the cell signaling pathway associated with use of grape seed extract that led to cell death, or apoptosis. They found that the extract activates JNK, a protein that regulates the apoptotic pathway.
http://www.happynews.com/news/122009/grape%20seed%20extract%20kills%20leukemia%20cells%20lab.htm