Sangamo Announces ASGCT 2024

Fabry Disease

Isaralgagene civaparvovec
(formerly known as ST-920)
  • Status
    Phase 1/2
  • Partner
    Wholly owned
  • Technology
    Liver-targeted AAV gene therapy


Fabry disease is a lysosomal storage disorder caused by mutations in the galactosidase alpha gene (GLA), which leads to deficient alpha-galactosidase A (α-Gal A) enzyme activity, which is necessary for metabolizing globotriaosylceramide (Gb3). The buildup of Gb3 in the cells can cause serious damage to vital organs, including the kidney, heart, nerves, eyes, gut and skin.

Symptoms of Fabry disease can include decreased or absent sweat production, heat intolerance, angiokeratoma (skin blemishes), vision problems, kidney disease, heart failure, gastrointestinal disturbance, mood disorders, neuropathic pain and tingling in the extremities.

Genomic medicine approach

Isaralgagene civaparvovec is a liver-tropic rAAV 2/6 vector carrying the cDNA for human α-Gal A that is delivered through a single dose IV infusion. Isaralgagene civaparvovec aims to deliver a working copy of the GLA gene to the liver so that liver cells can start producing functional α-Gal A.

Phase 1/2 STAAR Study

The Phase 1/2 STAAR study is a global open-label, single-dose, dose-ranging, multicenter clinical study designed to evaluate the safety and tolerability of gene therapy candidate isaralgagene civaparvovec. Isaralgagene civaparvovec requires a one-time infusion.

The STAAR study enrolled patients who are on enzyme replacement therapy (ERT), are ERT pseudo-naïve (defined as having been off ERT for six or more months), or who are ERT-naïve.


Isaralgagene civaparvovec has received Orphan Drug, Fast Track and RMAT designations from the U.S. Food and Drug Administration (FDA), Orphan Medicinal Product and PRIME designations from the European Medicines Agency (EMA), and ILAP designation from the U.K. Medicines and Healthcare products Regulatory Agency (MHRA).

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