Obviously, I wasn't happy about this! I do not recall ever having made such a claim. If I have, please point it out and I will make a full retraction and apology. The study in question is Vitamin D and calcium supplementation reduces cancer risk: results of a randomized trial.
Please note: Ignoring cancer diagnoses within the first 12 months removes results from women who had undiagnosed cancer at the start of the study.
What the study shows:
Taking 1,100iu/day of Vitamin D3 + 1,400-1,500mg/day of Calcium: When analyzed by intention to treat, cancer incidence was lower in the Ca + D women than in the placebo control subjects (P < 0.03). When analysis was confined to cancers diagnosed after the first 12 mo, RR for the Ca + D group fell to 0.232 (CI: 0.09, 0.60; P < 0.005). 0.232 is a reduction of 77%.What the study doesn't show:
Taking Vitamin D3 only reduces the RR for cancer incidence. I believe that it probably does.Taking Ca + D reduces the RR for cancer recurrence. I believe that it probably does.
Taking more than 1,100iu/day of Vitamin D3 reduces cancer incidence more. I believe that it probably does.
Taking Ca + D reduces the RR for cancer incidence in pre-menopausal women. I believe that it probably does.
Taking Ca + D reduces the RR for cancer incidence in men. I believe that it probably does.
Taking Ca + D increases the RR for breast cancer mortality. I believe that the opposite is the case.
Anything other than what the study shows.
See also Is Vitamin D Shooting Me in the Foot?
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