Narrator: This is Science Today. Using worldwide data collected by a new tool called GLOBOCAN, researchers at the University of California, San Diego have found a clear association between deficient sunlight exposure and breast cancer. Dr. Cedric Garland, a cancer prevention specialist at the university's Moores Cancer Center, says the database found that breast cancer incidence was highest at the highest latitudes in both hemispheres.
Garland: They're based on the comparison of the incidence rates of these cancers in 177 countries in the world from the World Health Organization using a new database called GLOBOCAN. In using this tool, we're able to determine whether the distribution of disease conforms to what's called a cosine law, which is a law that relates to the intensity of sunlight. And we found that they all conform to the same law. Namely, as you get further away from the equator, you have more and more incidence of these cancers and as you get close, they virtually disappear.
Narrator: This is the fourth paper from this research team to show a strong association between vitamin D and cancer using the global incidence data. For Science Today, I'm Larissa Branin.