Postprogression survival by era. Kaplan-Meier estimates of postprogression survival are shown for patients who relapsed or progressed after autologous transplantation done in 2001 to 2010 (red) and 2011 to 2020 (blue). The bottom panels show postprogression survival for patients who underwent subsequent allogeneic transplantation (left) or no allogeneic transplantation (right).