NorthWest Biotherapeutics Inc (NWBO)

[gropgrip]

Being healed in oncology refers to a patient who survives for at least five years without relapse (recurrence). This definition of "cured" is problematic because many relapses occur at a later date. Thus, patients are included in the cancer success statistics that later die of cancer. However, for most cancers, after five years without a recurrence, average life expectancy approaches that of peers.

From German Wikipedia

However one judges this personally, it seems to be the norm