Particle beam radiation - also known as proton therapy - is a "promising" cancer treatment, but potential advantages over alternative radiation therapies remain unproven due to a lack of long-term comparative studies, according to a Sept. 14 Agency for Healthcare Research and Quality technical brief. AHRQ says it sponsored the rapid-turnaround technical report to provide an update on the emerging technology given its limited evidence base. The report was published in the Sept. 15 Annals of Internal...