The National Marrow Donor Program. Meeting the needs of the medically underserved

The National Marrow Donor Program operates the world's largest registry of volunteer unrelated stem cell donors. In recent years, the program has focused on building a large and diverse donor file. After initial recruitment, however, months or years may elapse before a potential donor is contacted on behalf of a searching patient. Here, the author begins to explore factors that influence donor availability at the confirmatory typing stage of the search process.

Over a 1-year period from March 1, 1999 through February 29, 2000, the author evaluated donor unavailability rates at the confirmatory typing stage of the search process. Unavailability rates by donor racial/ethnic group and by donor center were evaluated. To determine the consistency within individual donor centers, the author compared donor unavailability during the first 6 months of the observation period with unavailability during the second 6 months.

Donor unavailability at confirmatory typing was higher among donors registered with domestic (U.S.) donor centers. The self-identified racial or ethnic group of the donor also affected the likelihood the donor will be available when requested. Between individual donor centers, there were large differences in the overall donor unavailability. Rates of donor unavailability tended to remain consistent at individual centers over time.

This study suggests that procedures used at individual donor centers may dramatically impact donor unavailability. Future initiatives should undertake to identify best practice models for donor recruitment, retention, and subsequent contacts.