DFI (Disease-free interval event): 1 for patient having new tumor event whether it is a local recurrence, distant metastasis, new primary tumor of the cancer, including cases with a new tumor event whose type is N/A. 0 was defined by: "treatment_outcome_first_course" is "Complete Remission/Response"; or the value is "R0" in the field of "residual_tumor"; or the value is "negative" in the field of "margin_status". If the tumor type did not have any of these fields, then its DFI was NA.
DFI time: "new_tumor_event_dx_days_to" for events, or for censored cases, either "last_contact_days_to" or "death_days_to", whichever is applicable.