A new study provides guidance for doctors trying to determine if a man has aggressive prostate cancer. Researchers at Kaiser Permanente studied the medical records of more than 200,000 men, age 45 and older, who had not been diagnosed with prostate cancer. They found looking at a man's PSA test results over a period of several years was a better predictor of aggressive prostate cancer than a single measurement. They also found a majority of men saw their PSA score increase three percent each year. The researchers say this could help doctors distinguish which cancers are progressing quickly, from those that are slow-growing and don't need treatment. PSA tests are recommended for men who have symptoms of prostate cancer, like trouble using the bathroom.
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