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A large-scale crowd-sourced study of Vitamin D and breast cancer is also taking place. People are modifying the Vit D intake and having it measured, then looking at outcomes.
Search mercola.com
I believe the study will show that sufficient Vitamin D, not too much or too little, correlates with not getting cancer. We are taking that study as gospel from initial positive results and modified our diet and had Vit D blood level checked.
Dermatologists say block the sun from your skin. Healthy people say get plenty of sunshine on your skin, not enough to cause sunburn, but enough to raise your vitamin D level to what it should be. Or supplement if you can't get natural sunshine.
Worth researching. I'm already convinced.