To really understand rare conditions, you need a lot of data from a lot of patients. But no one hospital or center usually sees more than a few patients with any given rare disease, precisely because they’re rare.
This is where case registries become important. These research collaborations, which usually span several institutions, typically focus on a single rare disease or a few related conditions, serving as a data warehouse for collecting information from as many patients and as many places as possible.
One thing that most people don’t realize about stem cell transplants (also called bone marrow or hematopoietic stem cell transplants) is that for patients, the transplant itself is probably the easiest part of the process. The grueling part is the preparation for a transplant, called conditioning.