Patients with terminal or end-stage cancer sometimes do not understand their actual chances of survival. This misunderstanding can affect their decisions regarding treatments and end-of-life care. Patients may misunderstand their survival chances for several reasons. For example, some patients may continue to believe they will be cured despite being told otherwise. Families may sometimes contribute to patients' misunderstandings by hiding or downplaying negative information. Moreover, doctors may not discuss survival chances with patients, or they may give patients inaccurate information. Few studies have investigated doctors' willingness to give terminally ill patients information about their chances of survival.