Keryx Biopharmaceuticals Inc on Tuesday said its drug to treat iron deficiency anemia in chronic kidney disease patients not yet requiring dialysis met the goals of a late stage clinical trial, potentially paving the way for an expanded approval of the treatment. In the 16-week study of 234 patients with moderate to severe kidney disease, 52 percent of those who received Keryx's ferric citrate saw their hemoglobin levels rise by at least 1 gram per deciliter of blood during the trial.