CRISPR Therapeutics

CTX310

In Development

An in vivo gene-editing therapy delivered by lipid nanoparticles that knocks out the ANGPTL3 gene in the liver to lower triglycerides and LDL cholesterol - a potential one-time treatment for severe dyslipidemia and cardiovascular risk, and the lead of CRISPR's in vivo pipeline.

Latest update Sep 10, 2026

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Current status

Phase 1a complete; Phase 1b underway in severe hypertriglyceridemia and refractory hypercholesterolemia (US trials initiated, ex-US ongoing). One-year Phase 1a follow-up presented at ESC Congress on August 28, 2026 and published in NEJM: at the highest dose, mean reductions were 79% ANGPTL3, 48% triglycerides, and 53% LDL, with no treatment-related serious adverse events across 15 participants. A separate Phase 1b clinical update remains due in H2 2026.

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Specifications2

Target
ANGPTL3 (in vivo, liver)
Phase 1a 12-month Effect (highest dose)
Mean LDL -53%

(max 84%); triglycerides -48% (max 78%); ANGPTL3 -79% (max 89%)

Announced next steps from CRISPR Therapeutics that mention CTX310.

  1. H2 2026

    Advance in vivo cardiovascular programs

    TargetH2 2026 (Phase 1b, Lp(a) update)

    Having presented one-year CTX310 (ANGPTL3) Phase 1a follow-up at the European Society of Cardiology Congress on August 28, 2026 (15 participants; highest-dose mean LDL -53% and triglycerides -48% through 12 months; no treatment-related serious adverse events) - simultaneously published in NEJM - CRISPR still owes a separate CTX310 Phase 1b clinical update by year-end 2026, with Kulkarni at Morgan Stanley on September 14 saying the immediate focus is severe hypertriglyceridemia (triglycerides plus biomarkers such as LDL, HbA1c and hepatic fat) to inform pivotal-trial discussions. The company also continues progressing the Lp(a)-lowering program CTX321.

  2. 2026

    Present CTX310 Phase 1b sHTG late-breaking oral at AHA Scientific Sessions

    TargetMonday, November 9, 2026, 8:00 a.m. CST (AHA LBS.05); embargoed until then

  1. CRISPR Therapeutics reports CTX310 durability data at ESC

    CRISPR Therapeutics presented a late-breaking Phase 1a durability update for CTX310, its in vivo gene-editing therapy targeting ANGPTL3, at the European Society of Cardiology Congress in Munich on August 28. Across 15 participants with average follow-up of at least 60 days, the company reported no treatment-related serious adverse events and no grade 3-or-higher liver-transaminase changes, with a separate Phase 1b clinical update still due in the second half of 2026.

    CRISPR Therapeutics

  2. CRISPR Therapeutics starts CTX340 and CTX460 trials in Q2 update

    CRISPR Therapeutics reported second-quarter 2026 results on August 3, ending the quarter with $2,364.4 million in cash and investments and narrowing its net loss to $91.2 million from $208.5 million a year earlier. The company said it initiated Phase 1 trials for CTX340, an in vivo editing candidate for refractory hypertension, and CTX460, the first candidate from its new SyNTase editing platform for alpha-1 antitrypsin deficiency, broadening its in vivo pipeline beyond the cardiovascular program CTX310.

    BioSpace Manila Times (GlobeNewswire)

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