As a stagnated stand-alone treatment, DCVAX-L is 10-15 years too late. Neuroscience understanding has moved, so much so that GBM4 is not even recognised as a diagnosis any more by WHO.
NWBO owns a Nokia 3310, in a world of IPhone 14+
There will be NO NWBO buyout.
Advent almost certainly at a later date, as they produce combination variants for third parties , BUT for that, ADVENT does not need NWBO to get an MAA.