Full-scale prevention trials will then start.

However trials investigating their use as palliative treatment have failed to show positive results while no prevention trial has been completed.

Lowering cholesterol concentrations and mortality: a quantitative review of primary prevention trials.

Another problem arises from the 'low risk' situation in prevention trials.

That the ethics of prevention trials is often a resource driven argument is tacitly assumed but rarely explicitly stated.

Four principles therefore underlie randomised prevention trials.

During prevention clinical trials, information is collected about the effects of a new prevention method and how well it works.

Before beginning the prevention trial, the Australian researchers conducted a preliminary study to test the criteria they were using to determine high risk.

None of these primary prevention trials was designed to detect differences in breast cancer mortality.

The staff is actively participating in approximately 150 clinical and prevention trials to provide optimal patient treatments.