Xtandi was sold by its inventor, Dr. Sawyers, to MDVN because it has too many side effects. He is now working for JNJ getting final FDA approval for ARN509 which is more effective and has fewer sides effects than Xtandi.
That approval will not come in years. Besides, they have to compare head-to-head with Xtandi in these patient populations. Oops, you may have a better drug, but you are too late in the gaem.