Dr. Chance introduces a variety of unknowns into Kate’s future: namely, whether she goes into remission, and what to do for her treatment in the (more likely) event that she doesn’t. Rather than entertaining all of these complex possibilities, Sara attempts to prepare herself by asking about Kate’s death. However, Dr. Chance’s response about the percentage of children in the ward who will survive serves as a reminder that the future is uncertain; Kate could die, but she could survive, too.