At age 42, Milena Remic learned she had advanced-phase chronic myeloid leukemia, a cancer of the white blood cells. To survive, she needed to receive a transplant of blood-forming stem cells from a genetically compatible donor. Ms. Remic, who lives in Slovenia, matched with a donor and underwent the complex procedure to replace her cells with healthy donor cells. It was a success. Now 54, she is committed to helping other patients with blood cancer. Ms. Remic is vice president of the Slovenian Lymphoma and Leukemia Patients Association, and spends her days working on disease awareness and patient support initiatives. She is also involved in a national campaign called Enroll Yourself, which encourages eligible candidates to enroll as potential blood stem cell donors. She credits her own donor with saving her life.