No crystal ball
Two very different questions are: 1) What are my chances of being cured? 2) What is my life expectancy?
For #1, we often give the percentage of patients who were alive at some fixed time point (e.
g. 60% after 5 years). For #2, we may give the median number of years lived by previous patients. A median is the 50th percentile. It means that half of patients lived longer and other half shorter.