SAN DIEGO--(BUSINESS WIRE)--Ardea Biosciences, Inc. (Nasdaq:RDEA) announced today that it has initiated a Phase 1/2 study of RDEA119, its lead mitogen-activated ERK kinase (MEK) inhibitor for the treatment of cancer, in combination with Nexavar, which is currently approved for the treatment of unresectable hepatocellular carcinoma and advanced renal cell carcinoma.