This is consistent with a study almost a decade ago. That study was done in colon cancer and with a higher dosage, although still fairly small. It found a survival benefit to the vitamin D supplementation as well.

There are numerous Vitamin D studies that show no survival benefit, but they all used ridiculously low dosages. Some do not even reach the standard INFANT dose, much less an adult dose.

To date, no randomized controlled trial I have seen has used a large dose of Vitamin D, though. This trial was quite small, and most of a the patients were still Vitamin D deficient. What would happen with larger doses? What if the patients were well into the healthy level of serum Vitamin D? I would really like to see that.