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A hormone treatment used in a small study did not slow aging-related prostate growth, researchers said. The study included 114 men, age 50 or older. They were asked to apply a gel to the skin of their trunk or upper leg each day for 2 years. They were randomly assigned into two groups. One group received a gel that contained the hormone dihydrotestosterone. The gel for the other group contained no hormone. At the beginning and end of the study, the men had ultrasound tests to show prostate size. In both groups, the size increased over time. There was no difference between the groups. The journal Annals of Internal Medicine published the study November 15.

Some heart patients get dangerous levels of radiation from tests, a new study suggests. The study included 1,000 people. All were heart patients at Columbia University Medical Center. Medical records were used to add up each person’s total radiation dose from tests. These included an advanced stress test called myocardial perfusion imaging (MPI). This test uses a radioactive substance to highlight blood flow patterns to the heart. Nearly 1 out of 3 people who got this test received at least 100 millisieverts of radiation from all tests. That dose is considered high enough to possibly increase cancer risk. About 1 out of 9 people received at least double that dose. Nearly 1 out of 5 people in the study received 3 or more MPI tests. The study was presented at a conference. Reuters Health news service wrote about it November 15.