A new study suggests a little time off -- a drug holiday -- can cut down on troubling side-effects of prostate cancer treatment for some patients without hastening death. The Canadian-led research shows men who were given intermittent courses of drugs that suppress the production of male hormones lived as long as men who received continuous therapy. But the men on the intermittent course had fewer of the unpleasant side-effects that go along with this type of prostate cancer treatment.