I think there is a problem even on a higher level. I am not aware for example that the detailed history of cancer patients, is recorded centrally for later data

I think there is a problem even on a higher level. I am not aware for example that the detailed history of cancer patients, is recorded centrally for later data analysis. Which treatment worked, which did not? Even airlines now share data about flights to help engineer around the world to find remedies for problems with small incidence levels. I wonder why that is so complicated in the case of cancer