KM plots using data from a Local Xena Hub

To visualize and perform a KM analysis, we use two columns/rows of data, time to event and event. These data must be loaded in a phenotype file. The phenotype file can contain other data as well.

Note that you will need to name the headers in your phenotype file EXACTLY what we recognize. See the list of recognized headers for each type of survival/interval below.

This data can be in days, months, years, etc.

Time to Event and Event

Time to Event is a duration variable for each subject having a beginning and an end anywhere along the timeline of the complete study. It begins when the subject is enrolled into a study or when treatment begins, and ends when the end-point (event of interest, for example, death or metastasis) is reached or the subject is censored from the study.

Censoring means the total survival time for that subject cannot be accurately determined. This can happen when something negative for the study occurs, such as the subject drops out, is lost to follow-up, or the required data is not available or, conversely, something good happens, such as the study ends before the subject had the event of interest occur, i.e., they survived at least until the end of the study, but there is no knowledge of what happened thereafter.

Event indicates what the 'event' was for a patient, 1 for the event, for example, death or metastasis, and 0 for censored.

Help text was partially taken from A PRACTICAL GUIDE TO UNDERSTANDING KAPLAN-MEIER CURVES.

Recognized header names for different types of survival

Below is a table of the column/row header names we recognize for each type. Note that these header names are case sensitive.

Survival Type

'Time to Event' Header name

'Event' Header name

Overall Survival

OS.time

OS

Disease free interval

DFI.time

DFI

Disease specific survival

DSS.time

DSS

Progression free interval

PFI.time

PFI

Local recurrence interval

LRI.time

LRI

Distant metastasis interval

DMI.time

DMI

Distant disease free survival

DDFS.time

DDFS

Invasive disease free survival

IDFS.time

IDFS

Regional recurrence

RR.time

RR

Relapse

Relapse.time

Relapse

Metastasis

Metastasis.time

Metastasis

Distant recurrence interval

DRI.time

DRI

Distant metastasis free survival

DMFS.time

DMFS

Example Overall Survival

sample

OS

OS.time

TCGA-AB-1234-01

0

100

TCGA-AB-6789-01

1

200

TCGA-CD-1234-01

0

300

TCGA-CD-5678-01

1

400