GlaxoSmiithKline Plc (GSK.L), Europe's biggest drugmaker, said on Monday it had asked U.S. regulators to approve its experimental breast cancer drug Tykerb, a potential rival to the blockbuster Herceptin.
Tykerb is one of three cancer medicines that the British-based firm hopes to launch next year, signalling its arrival as a major force in oncology. The others are cervical cancer vaccine Cervarix and platelet-booster eltrombopag.
