I wonder what happened to those 3 unlucky guys for who it didn't work. Were they just too physically weakened+had too much tumors to survive the resulting cytokine storm, leaving the doctors with a grim choice between letting patient die of cancer by suppressing T-cells too much, or from cytokine storm by not suppressing them enough? Or there was simply no result from these T-cells, like they failed to multiply to work, or failed to work after multiplying?