No, chapter 11 does not wipe out any share holders unless there is recovery plan to issue new shares and wipeout debt.
when companies are near successful and hope for approvals but are cash strapped, they choose path of Chapter 11 and sit on hands, prepare plan of reorganization, by then news hits, PPS rises, and shorts get wiped out.
NWBO may not even need to go this route, its fear mongering out here as they have real agenda. Imagine not a single analyst (disappointed with Smith on Stocks too) has come out with PR over ASCO minutes.