The median age for all people of the same general group with the same type of cancer in the same stage.
If you were diagnosed with Stage 4 Lung Cancer, it would start with a list of all survival times for people with Stage 4 Lung Cancer, filtered to the same gender and potentially other factors and then sorted in from most to least. The number in the middle would be the life expectancy.
If using a range instead it would be a range that covers ~78% of people on the list centered around that middle point.
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