Staring down a $6 billion patent cliff for its prostate cancer drug Xtandi, Astellas aims to counter the inevitable revenue decline with a 200 billion yen ($1.3 billion) cost-savings program anchor | Staring down a $6 billion patent cliff for its prostate cancer drug Xtandi, Astellas aims to counter the inevitable revenue decline with a 200 billion yen ($1.3 billion) cost-savings program anchored in its new five-year strategic plan. But to CEO Naoki Okamura, “it’s not simply saving the cost or reducing the headcount.”