Become a perfect match: join the Australian Bone Marrow Donor Registry. Every 40 minutes someone in Australia is diagnosed with blood cancer, and for many a blood stem cell transplant from a complete stranger is their only hope. Donors need to be specifically matched to the patient, which makes it tricky to find a donor for patients with rare tissue types. Joining the Registry is quick and easy, and the more people that join the better chances patients have of finding a perfect donor match.