Author Response to “In Defense of the UVB-Vitamin D-Cancer Hypothesis.”

Excerpt

In his letter criticizing my article on Vitamin D, cancer, and dysregulated phosphate metabolism, William B. Grant, Ph.D., declares a conflict of interest, writing that he receives funding from a well-known vitamin supplement firm. In researching my article, my main focus was purposively not placed on the plethora of research studies from the past showing mixed findings of vitamin D supplementation and cancer prevention—a body of research which Dr Grant referred to as supporting the UVB-vitamin D-cancer hypothesis. Rather, my objectives included briefly summarizing findings from the most recent large clinical trials of vitamin D supplementation and cancer, such as the Vitamin D and Omega 3 Trial (VITAL) [1] and the Vitamin D Assessment study (ViDA) [2]. Although these major studies do not support cancer prevention with vitamin D supplementation, nevertheless, my article stressed that vitamin D supplementation and cancer prevention remains an unsettled issue due to variable findings. …