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Regular blood tests can detect 86% of ovarian cancers before the point at which women normally would be diagnosed, according to a trial. Ovarian cancer kills an estimated 140 thousand women around the world each year. The 14-year British trial involved more than 200 thousand women. Professor Usha Menon coordinated the trial at University College London and explained how important the findings were... (Picture: Blood analysis. Credit: Thinkstock)