Diversity Gaps Closing Slowly Through New Matching Science in the Bone Marrow Transplant Market

In previous years, Stanford Medicine published results from a Phase 1 trial in Nature Medicine that quietly shifted expectations for patients who once faced the harshest conditioning regimens. Three children with Fanconi anemia received an antibody directed against CD117 instead of radiation or the chemotherapy agent busulfan. The antibody, briquilimab, cleared their own blood-forming stem cells without the DNA damage those traditional agents cause.

All three children, each younger than ten and from different ethnic backgrounds, reached nearly 100 percent donor chimerism by two years later. None experienced graft rejection. One of them, Ryder Baker from Seguin, Texas, now plays pickleball and soccer, energy levels restored after years of fatigue and frequent infections.

Expanding the Circle of Possible Donors

• For decades roughly one-third of patients never reached transplant because a fully matched donor could not be found.
• Recent work has changed that arithmetic. Researchers at Stanford combined the CD117 antibody with selective removal of alpha/beta T-cells from the donor graft.
• This step lowers the risk of graft-versus-host disease and makes half-matched parental donors far more usable.
• Parallel efforts by the National Marrow Donor Program through the ACCESS trial have tested post-transplant cyclophosphamide after transplants from mismatched unrelated donors.
• Interim findings shared at major hematology meetings show that outcomes for 7/8 matches can approach those of fully matched grafts for many adults with blood cancers.
• Haploidentical transplants from family members now account for a substantial share of allogeneic procedures in major centers, giving patients who once had no options a realistic path forward.

The Living Global Network of Volunteers

The World Marrow Donor Association currently lists more than 43.7 million potential adult donors and cord-blood units across 56 countries. In the United States the C.W. Bill Young Cell Transplantation Program reported more than 9.4 million adult registrants by the end of fiscal year 2025 and facilitated over 8,400 unrelated transplants that year.

Genetic diversity on the registries continues to grow, though match rates still vary by ancestry. New registrants from underrepresented communities are being added steadily, and search algorithms now surface workable mismatched options more quickly. These numbers represent real people who have agreed to step forward when a stranger’s life depends on it.

Stories That Stay With Clinicians

• Beyond the trial data sit individual lives.
• A 39-year-old man with chronic myeloid leukemia received a haploidentical graft from a relative more than a decade ago and remains in continuous remission, marking ten cancer-free years in 2023.
• Pediatric teams at Johns Hopkins and other centers have now performed hundreds of haploidentical transplants for high-risk leukemias and lymphomas with toxicity profiles comparable to traditional fully matched procedures.
• Caregivers, often parents or spouses who spend weeks in isolation rooms, describe the strange mixture of hope and exhaustion that accompanies every blood count.
• Their experiences are beginning to shape how transplant units organize support, recognizing that the recovery of the patient is tightly bound to the resilience of the people who stay at the bedside.

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Looking at the Practice as It Exists Today

Transplant teams are learning to tailor intensity more carefully. Older adults and patients with additional medical conditions who once would have been turned away are now candidates for lower-toxicity approaches. The same antibody platform being tested in Fanconi anemia is under consideration for frail cancer patients who cannot tolerate full-dose radiation or busulfan.

At the same time, centers continue to refine graft processing and infection prevention so that the weeks after infusion become less perilous. Each successful case, whether a child returning to the soccer field or an adult returning to work, adds quiet evidence that the procedure is becoming both safer and more widely reachable. The work remains unfinished, yet the direction of travel is unmistakable: more patients, more kinds of patients, and fewer irreversible side effects.