Statistics studies are usually performed over an extended time period . The study itself usually lasts about 5 years or longer. Add another 1-2 years to write the research paper and get it into print. This means that survival or remission statistics are about 5-10 years old or older. Remember that any set of statistics applies to a specific list of criteria.
Clinical trials have a rigid list of things which determine who can participate in the study.
No matter how similar your situation is, if your personal circumstances are only slightly different, the statistics are not totally applicable to you and your situation. Statistics only really apply to the mythical human being who reacts like everybody else .Even if you appear to fit the criteria of a specific study, each human body reacts in a different way to the same situation. For example, if we all eat the exact same amount of an identical food, there will be many different reactions. Statistical numbers can be manipulated to appear good or bad , to emphasize one side over the other. Statistical group size makes big differences in the results.