I can tell you the person I know that has lived 10 years. They were very interested in the genetic makeup of the tumor. Since it is a tumor lysate and they have the tumor tissue they will likely have a lot of this information.
They went back and collected data for a lot of biomarkers that were not understood when the trial started, years before some of these relationships had been discovered of fully understood.
I believe they will likely be able to bank tissue for subsequent use. I believe that ability will allow them to create a unique tissue library that over time, in combination with other data, would be potentially very valuable, though they'd need to get relevant permissions.