Editas Medicine Targets 2026 Patient Dosing for LDL Gene-Editing Therapy

Key Points

• Editas Medicine remains on track to dose patients in 2026 in a Phase I/II trial of EDIT-401, an in vivo CRISPR therapy designed to lower LDL cholesterol by increasing LDL receptor production.
• EDIT-401 reduced LDL cholesterol by an average of 90% in non-human primates and also lowered lipoprotein(a) and ApoB, potentially offering greater LDL reduction than PCSK9-based therapies.
• The company expects initial safety data in the first quarter of 2027 and broader safety and efficacy data later that year. Editas reported $212 million in cash, which it expects will fund operations into the second half of 2028.

Editas Medicine NASDAQ: EDIT outlined its strategy as an in vivo gene-editing company and said it remains on track to dose patients this year in a clinical study of its lead program, EDIT-401, for lowering LDL cholesterol.

Speaking at the Cantor Healthcare Conference, President and Chief Executive Officer Gilmore O’Neill said the company has completed its shift toward developing in vivo therapeutics using CRISPR editing. Editas is prioritizing programs designed to produce meaningful efficacy improvements, use mechanisms differentiated from other drug modalities, offer measurable biomarkers for rapid clinical decision-making, and potentially be delivered through a single infusion or injection.

EDIT-401 Targets LDL Receptor Upregulation

EDIT-401 is designed to reduce LDL cholesterol by increasing levels of the LDL receptor, which removes LDL cholesterol from circulation. O’Neill said the program uses CRISPR-Cas9 and CRISPR-Cas12 editing tools to mimic naturally occurring gain-of-function genetic variants rather than applying gene editing to mechanisms accessible through antibodies, antisense therapies or siRNA medicines.

The company’s approach is based on a naturally occurring LDLR variant identified in an Icelandic family whose members had low LDL cholesterol levels but were otherwise healthy, according to O’Neill. The variant involved a deletion in the three-prime untranslated region of the LDLR gene, removing microRNA binding sites and extending the messenger RNA’s half-life, enabling production of more LDL receptor protein.

Editas selected a guide RNA pair that does not perfectly replicate the naturally occurring deletion but was more potent in exploratory work, O’Neill said. In non-human primate studies, EDIT-401 produced a mean 90% reduction in LDL cholesterol, along with reductions in other atherogenic lipoproteins including lipoprotein(a) and ApoB. The company said it observed at least a sixfold increase in LDL receptor expression in the liver in those studies.

O’Neill contrasted the strategy with approaches targeting PCSK9, saying PCSK9 inhibition may face a ceiling effect because it prevents degradation of LDL receptors already produced by liver cells rather than directly increasing LDLR production. He said reductions of roughly 50% to 60% with PCSK9-directed approaches have been transformative but that Editas aims to produce greater LDL lowering through a different mechanism.

Clinical Timeline and Trial Design

Editas has submitted documentation to Australia’s Human Research Ethics Committee, or HREC, for EDIT-401 and is answering questions related to items such as the informed-consent form and starting dose. O’Neill said the company remains on schedule to dose patients this year, though he declined to specify the exact timing before receiving HREC clearance. If clearance were received, site activation could require a couple of months before the first patient is dosed, he said.

The planned Phase I/II study has two parts. Part one will use serial dose-escalating cohorts under a 3+3 design, with at least three patients per cohort and at least four cohorts. Editas is targeting a human-equivalent dose of about 0.6 milligrams per kilogram, which O’Neill said corresponds to the dose level expected to be fully efficacious based on non-human primate findings.

• First-cohort safety data are expected in the first quarter of next year.
• Top-line safety and efficacy data across multiple dose cohorts are expected later in 2027.
• Part two would expand the number of patients treated at the selected dose, with enrollment anticipated to be completed by the end of 2028.

O’Neill said the company expects to review results from the first phase of the study with regulators as it considers a pivotal program. He said approvals based on LDL cholesterol outcomes have precedent in studies involving a couple hundred patients, although any such plan would depend on discussions with regulators.

Market Opportunity and Financial Position

O’Neill said a substantial number of high-risk patients remain above LDL cholesterol goals despite treatment with statins, inclisiran and other therapies. Citing Merck’s Coral Reef study, he said 50% of patients receiving inclisiran alongside other cholesterol-lowering medicines did not achieve LDL cholesterol below 40 milligrams per deciliter. He estimated the potential U.S. population of patients with heterozygous familial hypercholesterolemia and established cardiovascular disease who remain above target at roughly 9 million to 10 million.

Chief Financial Officer Amy Parison said Editas had $212 million in cash as of the second quarter and expects its capital to fund operations into the second half of 2028. She said the runway is intended to support advancement through the first part of the Phase I/II study and into part two, allowing the company to seek human proof of concept for EDIT-401.

Editas also continues discovery-stage work on an in vivo hematopoietic stem cell-targeting program with potential applications in sickle cell disease and thalassemia. However, O’Neill said the company’s primary allocation of resources remains focused on advancing EDIT-401.

About Editas Medicine (NASDAQ:EDIT)

Editas Medicine is a clinical-stage biotechnology company focused on translating the power of gene editing into a new class of transformative genomic medicines. Founded in 2013 and headquartered in Cambridge, Massachusetts, the company leverages proprietary CRISPR/Cas9 and CRISPR/Cas12a (Cpf1) platforms to develop therapies aimed at correcting disease-causing genetic mutations. Editas Medicine's research and development efforts span multiple therapeutic areas, including inherited retinal diseases, hemoglobinopathies, and oncology.

The company's pipeline includes EDIT-101, a lead candidate designed to treat Leber congenital amaurosis type 10 (LCA10), which has entered early-stage clinical trials, and EDIT-301, targeting sickle cell disease and β-thalassemia using an ex vivo editing approach.

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