This part of the article was intriguing:
Figuring some women may have entered the study with undiagnosed cancer, the researchers excluded the results in the first year and assessed only the final three. The findings became even more powerful, with the women getting calcium and vitamin D3 experiencing a 77 percent lower cancer risk.
A few years ago on this blog I pointed to evidence that suggested sun exposure (and thus vitamin D blood levels) was tied to a lower risk of internal cancers. The evidence appears to be mounting that Vitamin D does in fact prevent cancer (and maybe even Multiple Sclerosis).