JNJ bought Aragon Pharma which owns ARN509. Aragon is run by Dr. Sawyers who also invented Xtandi. Dr. Sawyers sold his Xtandi to MDVN because he had a better drug which was safer, more effective and cheaper to produce than Xtandi. MDVN could have bought ARN509 from Dr. Sawyers, but David Hung wanted to steal it by suing Dr. Sawyers. MDVN lost its patent in court and now ARN509 was bought by JNJ who will shortly move it to Phase 3 and final approval.
MDVN didn't exactly help themselves out either by selling out entire company right to AZN. Even at peak exposure to market the losses continue to pile up. One day, after the insiders are seriously down leeching the company dry of any wealth, you will just (ticker delisted) on the search bar.