Gene therapy offers hope for 'Bubble Boy' disease, but leukemia risk remains

NCT ID NCT01129544

Completed Disease control Sponsor: David Williams Source: ClinicalTrials.gov ↗

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This trial tested a gene therapy for children with SCID-X1, a severe immune disorder, who do not have a matched bone marrow donor. The treatment involves harvesting the child's own bone marrow cells, fixing the broken gene in the lab, and infusing the corrected cells back after mild chemotherapy. Of the 8 children enrolled, some saw immune improvement, but the therapy carries a risk of leukemia, as seen in earlier studies.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: gene therapy (retrovirus-mediated gene transfer)
What this could lead to: If successful, this could offer a treatment option for SCID-X1 patients who lack a matched bone marrow donor, potentially restoring immune function without the need for lifelong medication.
What could go wrong: This is an early-phase trial with only 8 participants. Previous similar trials caused leukemia in 5 out of 20 children, and one child died. The procedure may not work for everyone, and long-term risks are still unknown.

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Conditions

The condition(s) this trial relates to.

severe combined immunodeficiency T-B+ severe combined immunodeficiency due to gamma chain deficiency X-Linked Combined Immunodeficiency Diseases

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

SEVERE COMBINED IMMUNODEFICIENCY

Contacts and locations

Locations

Children's Hospital Boston

Boston, Massachusetts, 02116, United States
Cincinnati Children's Medical Center

Cincinnati, Ohio, 45229, United States
Mattel Children's Hospital - UCLA

Los Angeles, California, 90095, United States

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