I'm writing a retrospective study presenting an overall survival analysis comparing two groups of patients. I implement a Cox regression model with some covariates and then present the results in various tables. In addition, I provide a table with 1, 3, 5 and 10-year overall survivals. My data regard patients treated until 2014.
One of the reviewers asked to clarify how I dealt with patients for whom there are no available data for 5-year survival (those treated from 2010) - "How were these cases examined with regard to the survival analysis?"
I am not sure about what he is asking and I hadn't thought about such aspect. How can I manage the issue and answer the reviewer?