That is the time frame 248 PFS events were reported by NWBO for primary completion. For 248 PFS events to have occurred at that time, instead of November 2016 or earlier as some bears have suggested, would imply strong PFS benefit for early treatment patients based on comparisons to other similar trials. Best wishes.
132 patients in the European arm of the trial. % of OS events of total enrolled to finish the trial is 70%. .7 * 132 is the number of OS events needed to "finish the trial". So the 92nd person died in Europe in Jan-Feb.
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