for people ages 18-75 (full criteria)
at La Jolla, California and other locations
study started
estimated completion



The purpose of AROAAT2001 (SEQUOIA) is to evaluate the safety, efficacy and tolerability of multiple doses of the investigational product, Fazirsiran Injection, administered subcutaneously to participants with alpha-1 antitrypsin deficiency (AATD).

Official Title

A Placebo-Controlled, Multi-dose, Phase 2 Study to Determine the Safety, Tolerability and Pharmacodynamic Effect of Fazirsiran (TAK-999, ARO-AAT) in Patients With Alpha-1 Antitrypsin Deficiency (AATD) [SEQUOIA]


Participants will be enrolled to receive multiple subcutaneous injections of Fazirsiran Injection (also referred to as TAK-999 Injection or ARO-AAT Injection) or placebo. Eligible participants will require a pre-dose biopsy completed as part of the study within the screening window. However, any participant with a biopsy result within 1 year of screening showing no fibrosis does not require a pre-dose biopsy. Only participants who have liver fibrosis will undergo a post-dose biopsy and may continue treatment in an open-label phase.


Alpha 1-Antitrypsin Deficiency, Fazisiran Injection


You can join if…

Open to people ages 18-75

  • Diagnosis of AATD
  • Liver biopsy at Screening indicating liver fibrosis (score less than F4); a patient with no fibrosis may participate based on a previous biopsy conducted within one year
  • Women of childbearing potential must have a negative pregnancy test, cannot be breastfeeding, and must be willing to use contraception
  • Willing to provide written informed consent and to comply with study requirements
  • Non-smoker for at least 1 year
  • No abnormal finding of clinical relevance at Screening

You CAN'T join if...

  • Clinically significant health concerns other than AATD
  • Previous diagnosis or diagnosis at Screening of definitive liver cirrhosis
  • Previous lung or liver transplant due to AATD
  • Regular use of alcohol within one month prior to Screening
  • Use of an investigational agent or device within 30 days prior to dosing or current participation in an investigational study involving therapeutic intervention
  • Use of illicit drugs within 1 year prior to Screening

    NOTE: additional inclusion/exclusion criteria may apply, per protocol


  • University of California San Diego Altman Clinical and Translational Research Institute
    La Jolla California 92037 United States
  • UCLA David Geffen School of Medicine, Center for Health Sciences
    Los Angeles California 90095 United States


in progress, not accepting new patients
Start Date
Completion Date
Arrowhead Pharmaceuticals
Phase 2 Alpha-1 Antitrypsin Deficiency Research Study
Study Type
About 40 people participating
Last Updated