Editas Medicine Reports Data Demonstrating Subretinal Injection of EDIT-101 Well-tolerated in Non-human Primates
“In this study, we administered either EDIT-101 or a non-human primate surrogate vector using the procedure that we plan to use in the Phase 1/2 study, and we found that EDIT-101 was well-tolerated over the duration of the study based on a panel of clinical tests. Importantly, neither the presence of pre-existing nor induced immunity in non-human primates to either AAV5 or Staph. aureus Cas9 impacted productive editing,” said
In this study, non-human primates were given a subretinal injection of vehicle control, EDIT-101, or VIR-067, an NHP-surrogate vector, with or without prophylactic, transient steroid treatment, and followed for six to 13 weeks. Ocular tolerability was assessed by ophthalmic examination using the modified SUN, Hackett-McDonald and SPOTS uveitis scoring systems and intraocular pressure measurements. Surgery procedure-related responses were mild, transient, and comparable between vehicle- and EDIT-101 or VIR-067-treated eyes.
Both EDIT-101 and VIR-067 were well tolerated in animals treated with prophylactic steroids. Delayed, mild inflammation was observed infrequently in animals that were not treated with prophylactic steroids. There was no delayed inflammation observed in EDIT-101 treated eyes after discontinuation of prophylactic steroids. Comparable intraocular pressures were reported between vehicle- and EDIT-101- or VIR-067-treated eyes throughout the study. Additionally, low levels of pre-existing or induced immunity to Staphylococcus aureus Cas9 (SaCas9) did not correlate with ocular inflammation, whereas the anti-AAV5 capsid immune response in non-immunosuppressed animals may contribute to delayed ocular inflammation. Nevertheless, neither SaCas9- nor AAV5-specific immunity impacted the pharmacological activities of the study drug.
About Leber Congenital Amaurosis
Leber Congenital Amaurosis, or LCA, is a group of inherited retinal degenerative disorders caused by mutations in at least 18 different genes. It is the most common cause of inherited childhood blindness, with an incidence of two to three per 100,000 live births worldwide. Symptoms of LCA appear within the first year of life, resulting in significant vision loss and blindness. The most common form of the disease, LCA10, is a monogenic disorder caused by mutations in the CEP290 gene and is the cause of disease in approximately 20‑30 percent of all LCA patients.
As a leading genome editing company,
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Source: Editas Medicine, Inc.