Patients in need of a bone marrow transplant are unable to find an appropriate donor match approximately 50 percent of the time.
"And so you've got 50% of the time people can't find someone to have their bone marrow donated." (said at 0:16:28)
The likelihood of finding an appropriate donor match for a hematopoietic stem cell (bone marrow) transplant varies significantly based on racial and ethnic background as well as the level of matching required (e.g., 8/8 vs 10/10 high-resolution HLA matching). Stating a flat 50% failure rate oversimplifies registry data. In the United States National Marrow Donor Program (Be The Match) registry, white patients of European descent have a 72–75% probability of finding a fully matched (8/8) unrelated adult donor, whereas patients from racial and ethnic minority groups face lower match probabilities, ranging from 23–30% for Black/African American patients to 44–46% for Asian/Pacific Islander and Hispanic patients. Overall, while 50% is a reasonable rough approximation when averaged across diverse populations, the actual success rate in finding a match ranges from 23% to 75% depending heavily on ethnicity.
- context: HLA match likelihoods for hematopoietic stem-cell grafts in the U.S. registry. (The New England journal of medicine 2014) · cited 1107x in the literature
"The likelihood of finding an optimal donor varies among racial and ethnic groups, with the highest probability among whites of European descent, at 75%, and the lowest probability among blacks of South or Central American descent, at 16%. Likelihoods for other groups are intermediate." (abstract, results, passage verified)
pubmedfull study (doi) - context: 8/8 and 10/10 high-resolution match rate for the be the match unrelated donor registry. (Biology of blood and marrow transplantation : journal of the American Society for Blood and Marrow Transplantation 2015) · cited 59x in the literature
"The 8/8 match rate for WH PP improved from 68% in 2009 to 72% in 2012. Corresponding match rates were 41% to 44% for HIS, 44% to 46% for API, and 27% to 30% for AFA, for 2009 and 2012, respectively." (abstract, results, passage verified)
pubmedfull study (doi)
Thousands of people die each year due to the lack of a suitable match or donor resource for bone marrow transplants.
"thousands of people die every year because they do not have a proper resource for their bone marrow transplant or whatever they need. Thousands of them, all right?" (said at 0:50:21)
Allogeneic hematopoietic stem cell transplantation (HSCT) is a potentially curative therapy for life-threatening hematologic malignancies and non-malignant disorders. While thousands of patients worldwide historically faced fatal delays or disease progression due to the lack of a suitable fully matched human leukocyte antigen (HLA) donor—with severe racial disparities where optimal unrelated adult donor match likelihoods drop as low as 16% for certain ethnic groups—the donor landscape has evolved substantially. The expansion of volunteer registries (e.g., the National Marrow Donor Program/NMDP), umbilical cord blood banks, and the widespread adoption of haploidentical (half-matched) family donors with post-transplant cyclophosphamide means that nearly all patients now have an identifiable donor source. Nonetheless, significant numbers of patients still succumb to disease due to delays in finding compatible donors, lack of optimal matches among diverse ancestries, and healthcare access barriers.
- context: HLA match likelihoods for hematopoietic stem-cell grafts in the U.S. registry. (The New England journal of medicine 2014) · cited 1107x in the literature
"Our models indicated that most candidates for HSCT will have a suitable (HLA-matched or minimally mismatched) adult donor. However, many patients will not have an optimal adult donor--that is, a donor who is matched at high resolution at HLA-A, HLA-B, HLA-C, and HLA-DRB1. The likelihood of finding an optimal donor varies among racial and ethnic groups, with the highest probability among whites of European descent, at 75%, and the lowest probability among blacks of South or Central American descent, at 16%." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Breaking Access Barriers to Autologous Stem Cell Transplantation and Chimeric Antigen Rece… (Transplantation and cellular therapy 2026) · cited 1x in the literature
"Additionally, delays and lack of referral from physicians to cellular therapy specialists add to the problem, risking relapse and missed opportunity for these treatments. Addressing these barriers with a sense of urgency, especially in the era of expanding cell therapy indications, could save many patients from succumbing to disease." (abstract, results, passage verified)
pubmedfull study (doi)