Some patients in TCGA data have days_to_death = 0 and days_to_follow_up = NA vice versa. Should I remove these samples before survival analysis? What does days_to_death = 0 mean? Does it mean the patient died the day follow up started?

  • $\begingroup$ Means before the follow-up started. NA means follow-up not appropriate for unspecified reasons. $\endgroup$
    – M__
    Jan 11 at 14:44

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