I had a data of 24 cancer patients; their 5-year overall survival (i.e. event as death) was around 57%, however, when I calculated 5-year event-free survival for the same cohort, defining the event as death or relapse, I got 61%.
I have scrutinized the data and I am 99.99% sure there is nothing wrong with it, and I could totally see how this could result from the survival function. I thought Cross Validated community might give more meaningful insights.
Is there anything wrong with this? Did that happen to you before? If so, how do you report it?
Of notice, this didn't happen anymore when the follow up was updated and 2 more cases were included. I also noticed that all the cases that died had also experienced an event before death.