The lead author, Dr. Joan Lappe, said, "“We’re looking at defeating cancer within our lifetime if we utilize this information. This is the first clinical trial to show that boosting Vitamin D status in conjunction with Calcium can affect the overall risk for cancer – a proposition that has tremendous public health potential. By choosing vitamin D rich foods and taking a supplement, Americans can help improve their Vitamin D levels and potentially impact their cancer risk.”
The take away message is to optimize your vitamin D levels year round. Use appropriate sunning technique (do not get burned!) or supplement with vitamin D3/vitamin K2 enough to keep your blood levels 50-70 ng/L year round.