Report

T Lymphocyte-Directed Gene Therapy for ADA SCID: Initial Trial Results After 4 Years

Science  20 Oct 1995:
Vol. 270, Issue 5235, pp. 475-480
DOI: 10.1126/science.270.5235.475

Abstract

In 1990, a clinical trial was started using retroviral-mediated transfer of the adenosine deaminase (ADA) gene into the T cells of two children with severe combined immunodeficiency (ADA SCID). The number of blood T cells normalized as did many cellular and humoral immune responses. Gene treatment ended after 2 years, but integrated vector and ADA gene expression in T cells persisted. Although many components remain to be perfected, it is concluded here that gene therapy can be a safe and effective addition to treatment for some patients with this severe immunodeficiency disease.

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