NorthWest Biotherapeutics Inc (NWBO)

[exwannabe]

No need to reverse engineer it.

As virtually always the case when looking at incomplete survival data the reported estimated median is the 50% cross of the KM curve.

Start at 100%. Every time period drop in proportion to the number of events / number then at risk. Say the curve was at 30% at 4 years. The next month half of the remaining patients event. The curve would then be at 15%.

Even when the trial is over the reported median will be the KM number. Not the time of the 166th event (unless they find all the lost souls).

Back on the earlier threads, you can not treat medians like means and average the average. Might get you in the ballpark at best. And in this data set can be way off as seen with meirluc's post.