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Amgen’s anemia rollercoaster — Biotechnology titan Amgen may have dodged a bullet when a study released Thursday showed that its anemia drug Aranesp didn’t shorten the lives of patients, after several other studies had suggested the opposite. But its anemia franchise isn’t out of the woods yet. A Wednesday report in the Journal of the American Medical Association revealed that for-profit dialysis clinics prescribe far higher doses of anemia drugs to their patients than do their non-profit counterparts, suggesting a profit motive behind the overuse of drugs that have been linked to cardiovascular problems at high doses.