The answers to questions of (a) the use of external controls and (b) changing of endpoints (e.g. whether data snooping occurred or not) are not black and white. But the nuances are hard to discuss on a message board (actually, everything is hard to discuss on a message board).
I’ve considered these questions and yet hold a sizable position.
I see Sentiment Stocks showed you the 2019 guidelines (See pages 14 and 15) . The trial risk is legally mitigated. Give up ex. Moreover, an endpoint in the trial still evaluates treatment arm against placebo for survival efficacy. Give up.