We are using cBioPortal data from the CoadRead data set to analyze overall survival.
We would like to know what is the start point for time of overall survival- is it time of diagnosis or time of first treatment or some other time point.
We had assumed that the start point was time of diagnosis but then we noticed that a number of cases had a followup time of "0" and 3 of these cases are patients who died.
We would especially like to know what is meant by a followup time of '0" for a patient who has died. Does this represent someone whose colorectal cancer was diagnosed at autopsy?
Thank you for your help!
Department of Biomedical Sciences
University of Minnesota Medical School Duluth