The authors did find a slight reduction in cancer incidence although this conclusion was questioned in the Journal of the American Medical Association.

Compared with placebo, men taking a daily multivitamin had a statistically significant reduction in the incidence of total cancer, with a hazard ratio (HR) = 0.92 (95% confidence interval (CI) 0.86-0.998; P = .04).

[3] The paper's co-principal investigator, Dr. J. Michael Gaziano, a cardiologist, was quoted by The New York Times as saying "it certainly appears there is a modest reduction in the risk of cancer from a typical multivitamin.

Second, they questioned the study's abilities to deliver on the question of whether a multivitamin would be protective in a well-nourished population (Bayesian probability) stating: "The plausibility of a protective effect is reduced by the absence of a clear path through which 30 different vitamins and minerals would cause a decline in the risk of multiple cancers and, especially, by the negative pattern of prior results."

[2] From the same double-blind study, they found that taking a daily multivitamin did not have any effect in reducing heart attacks and other major cardiovascular events, MI, stroke, and CVD mortality.