AVI - Saying that the FDA is "looking into the company" as the reason for the halt is entirely uninformative in my opinion. This captures every possibility because the FDA clearly would not have halted if they weren't looking into something. Could be consenting or other record keeping inadequacies, manufacturing issues, failure to adhere to protocol, etc. If it was for patient safety, they would not have allowed ANY patients to continue in the study because they were still receiving the DCVAX injections - that did not happen. My understanding is that the FDA does not halt for lack of efficacy - they are willing to let companies spend their money on trials as long as they are safe. So, yes, it was halted for something but the fact that they allowed those in the study to continue receiving treatment and the halt was lifted indicates that it was not a fatal issue.
Regarding your previous reply, I agree that the lack of info on interim efficacy analyses is weird - did they choose not to do it and "save alpha" but just never said so? Cannot imagine an independent DSMB would do an analysis then lie about it because they did not like results (thought a DSMB member said they did NOT do one). In the bigger picture beyond design and analysis details, there seems to be something accounting for unusually long survival based on blinded data to this point.