An international symposium on breast cancer at the end of 2011 featured a presentation from researchers who looked at the Vitamin D levels of women at the time they were diagnosed with breast cancer. The main finding: women with higher levels of D at diagnosis had significantly smaller tumors. Additional analysis of the follow-up data in this study showed that there was some relationship (termed of “borderline significance”) between higher levels of Vitamin D and lower risk of death from breast cancer. Furthermore, researchers detected a significant relationship between Vitamin D deficiency and risk of breast cancer relapse over a three year period.
The researchers suggested that Vitamin D’s anti-inflammatory effects might be the main mechanism by which Vitamin D levels influence breast cancer tumor size. The scientists presenting this research also called for further study to establish a clear cause-and-effect relationship between Vitamin D supplementation and breast cancer prevention. They also urged more research to determine the usefulness of Vitamin D supplementation as an additional therapy to bolster standard breast cancer treatments.
We accessed information about this presentation at the Dec. 2011 San Antonio Breast Cancer Symposium at
For more on Vitamin D dosage recommendations, see NYBC’s entries for this very inexpensive supplement: