It sucks to die a couple days before the Nobel committee announces your long awaited award. What is even worse is dying of the problem your research was meant to solve, ei Cancer. The other potential bummer is that the Nobel rules state the recipient must be alive at the time of the announcement.
Poor Steinman was not alive. The good news is that his life was extended because of his immunotherapy. Just not extended enough.
If I ever need immunotherapy the only guarantee I want is that I will live long enough to get my Nobel prize.