I am working on one of the Ovarian cancer TCGA clinical data . I would like to classify patients into two classes based on the survival. I took the column days to death (short : less than three years survival (3653) and long : > 3653 : greater than three year survival and classified the data.
It is also mentioned to use of days to death or days to last follow up for survival analysis (http://www.omnesres.com/tools/tcga/.
I am following one the publication where number of short and long survival are different from my observed count. https://academic.oup.com/jamia/article/22/1/109/832766.
Other study : (147 ST /193 LT )
In my case I have : ( ST 178/166 LT)
In my case, I just took column days to death and classified data into two classes. There are other columns are available such as "yearstobirth" "vitalstatus" "daystodeath" "daystolastfollowup"
I will appreciate all suggestions in case, if my approach need to be adapted.