The notion of recovery has to be defined. The purest definition of recovery would be based on complete eradication of the disease in the individual. Unfortunately, it is not possible to determine it for disease such as cancer, indeed people who appear to be cured by clinical criteria often have recurrences. That's why the concept of recovery requires careful definition. The statistical definition of recovery rely on the excess mortality risk becoming zero [VDCSMGB98] that can be revealed by the fact that the relative survival function tends to a value greater than zero
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