AF's twitter is biased to say the very least.
Marqibo is administered to heavily pretreated patients, i.e. patients with no more options/medicines left. In the natural course of things, they are, unfortunately, dying. Marqibo prolongs life but not for all patients, and therefor it cannot will not prevent all deaths.
It is sad that someone must misrepresent these facts, abusing the ill fate of dying people.
It makes you also wonder what the effect of Marqibo would be if applied at an earlier stage of the concerned diseases.