In studies, people with a certain type of prostate cancer taking Zytiga (Abiraterone) delayed starting chemotherapy by about 8 months. Treats metastatic, castration-resistant prostate cancer (mCRPC). Zytiga (Abiraterone) is an oral tablet that's taken once a day.
Onslaught is a military term that refers to an attack against an enemy. It's safe to say that no one wants to be caught on the receiving end of an onslaught, because there will be lots of danger, destruction and probably death.
The definition of barrage is  a large volume of something, or a huge amount of things happening all at once. An example of a barrage is when 100 reporters all shoot questions at the president at the same time. An example of barrage is a large amount of gunfire with the purpose of keeping the enemy forces from moving forward.