This has contributed to an increase in registrations at Matchis, the Dutch center for stem cell donors in Leiden and Nijmegen. This organization links donors to patients, everything is done almost anonymously. This all seems simple, but it is not because there are set requirements. As soon as there is a match with a patient, follow-up research with the potential donor follows, which are matched by Matchis. “In my father’s case, that didn’t work out then,” he says.