Swiss pharmaceuticals producer Roche Holding AG said Nov. 15 it has received approval from the U.S. regulators for its anemia drug Mircera, but is still awaiting resolution of a patent case before launching the drug in the United States.

Mircera, which has been approved by the U.S. Food and Drug Administration for patients with anemia caused by kidney failure, is the subject of a legal tussle between Roche and rival Amgen Inc.