Efficacy and Safety of AG10 in Subjects with Transthyretin Amyloid Polyneurophathy (ATTRibute-PN)

A Phase 3, Randomized, Double-Blind, Placebo-Controlled Study of the Efficacy and Safety of AG10 in Subjects with Symptomatic Transthyretin Amyloid Polyneuropathy (ATTRibute-PN Trial)

See updated study design under NCT04882735. Phase 3 efficacy and safety of AG10 compared with placebo in subjects with symptomatic Transthyretin Amyloid Polyneuropathy (ATTR-PN)

Study Overview

• Status: Withdrawn
• Conditions: Transthyretin-Related (ATTR) Familial Amyloid Polyneuropathy
• Intervention / Treatment: Drug: AG10; Drug: Placebo

Detailed Description

** See updated study design under ClinicalTrials.gov Identifier NCT04882735. **

Transthyretin amyloid polyneuropathy (ATTR-PN), also called "Familial Transthyretin-Mediated Amyloid Polyneuropathy (FAP)" is a hereditary condition caused by mutations in the TTR gene. It is estimated that around 10,000 people in the world are affected.

In ATTR-PN, amyloid builds up in the nerves that detect temperature, pain, and touch. Patients with ATTR-PN can experience a loss of sensation, tingling, numbness, or pain in the hands and feet (also called peripheral neuropathy).

In this study Eidos is researching the investigational drug AG10 800mg (2 tablets) administered orally twice a day. Through the study, Eidos wants to evaluate the efficacy and safety of AG10 in patients with ATTR-PN versus placebo.

This is an 18 month, placebo-controlled study. This means that, during the 18 month study, investigators conducting the research and study participants will not know whether the study participant is receiving AG10 or placebo.

The primary outcome of the study is the difference between AG10 and placebo groups in the Modified Neurologic Impairment Score +7 (mNIS+7) at 18 months of treatment versus baseline.

At the end of 18 months, participants may be eligible to receive investigational AG10, and there is no placebo. This is called an "open label extension." This part of the study may help us better understand the safety related to taking AG10 over a longer period of time.

• Study Type: Interventional
• Phase: Phase 3

Contacts and Locations

Study Locations

• United States
  • California
    • San Francisco, California, United States, 94104
      • Eidos Therapeutics

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 14 years to 86 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Be male or female ≥18 to ≤90 years of age;
• Have Stage I or II symptoms (polyneuropathy disability [PND] ≤IIIa) of ATTR-PN and an established diagnosis of ATTR-PN as defined by physical exam findings and/or neurophysiological test findings consistent with the diagnosis of ATTR-PN;
• Have an NIS of 5 to 130 (inclusive) during screening;
• Have a nerve conduction studies (NCS) score [sum of the sural sensory nerve action potential (SNAP), tibial compound muscle action potential (CMAP), ulnar SNAP, ulnar CMAP, and peroneal CMAP] of ≥2 points during screening. NCS is a component of mNIS+7;
• Have a mutation consistent with ATTR-PN either documented in medical history or confirmed by genotyping obtained at Screening prior to randomization. *No genetic testing is needed for subjects who are recipients of domino liver transplants;
• Have an anticipated survival of ≥2 years
• Have Karnofsky performance status ≥60 %;

Exclusion Criteria:

• Had a prior liver transplantation or is planning to undergo liver transplantation with a wild-type organ graft as treatment for symptomatic ATTR-PN during the study period.

Note: Recipients of a "domino" liver transplant from an ATTR-PN donor who have developed ATTR-PN mediated by their graft are allowed under this protocol, as long as re-transplantation to treat ATTR-PN is not planned during the study period and meets all other eligibility criteria;

• Has sensorimotor or autonomic neuropathy not related to ATTR-PN; for example, autoimmune disease or monoclonal gammopathy, malignancy, or alcohol abuse;
• Has Vitamin B-12 levels below the lower limit of normal (LLN);
• Has clinical evidence of untreated hyper/hypothyroidism;
• Has leptomeningeal TTR amyloidosis;
• Has Type 1 diabetes;
• Has had Type 2 diabetes for ≥5 years;
• Has active hepatitis B or C or known human immunodeficiency virus (HIV) infection;
• Has NYHA heart failure classification >Class II
• Had a malignancy within 2 years, except for basal or squamous cell carcinoma of
• Is currently undergoing treatment for ATTR-PN with patisiran, inotersen, or other gene silencing agents, marketed drug products lacking a label indication for ATTR- PN (e.g., diflunisal, doxycycline), natural products or derivatives used as unproven therapies for ATTR-PN (e.g., green tea extract, tauroursodeoxycholic acid [TUDCA]/ursodiol), within 14 days, or 90 days for patisiran and 180 days for inotersen prior to dosing. Prior to screening, tafamidis, if already prescribed to potential subjects as part of their established background therapy, is allowed at the labeled dosage and administration of 20 mg/day for the treatment of ATTR-PN with, i in the opinion of the Investigator, evidence of disease progression while on tafamidis treatment

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Triple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: AG10 800 mg; TTR stabilizer administered orally twice daily (BID)	Drug: AG10; TTR stabilizer administered orally twice daily (BID); Other Names: Oral AG10
Placebo Comparator: Placebo; Placebo administered orally twice daily (BID)	Drug: Placebo; Non-active control; Other Names: Placebo Oral Tablet

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change from baseline to Month 18 of treatment in Modified Neuropathy Impairment	Evaluate the difference between the AG10 and placebo groups in Modified Neuropathy Impairment which is a composite scale that asses,in part, muscle weakness, sensory loss, and decreased muscle stretch reflexes. It is calculated on a scale of 0 to 304 with higher scores indicating a worsening of the disease.	18 Months

Collaborators and Investigators

• Sponsor: Eidos Therapeutics, a BridgeBio company
• Investigators: Study Director: Mark McGovern, RN, CCRN, Eidos Therapeutics, a BridgeBio company

Study record dates

Study Major Dates

• Study Start (Actual): October 21, 2020
• Primary Completion (Estimated): March 31, 2024
• Study Completion (Estimated): April 30, 2024

Study Registration Dates

• First Submitted: May 22, 2020
• First Submitted That Met QC Criteria: June 1, 2020
• First Posted (Actual): June 5, 2020

Study Record Updates

• Last Update Posted (Actual): September 19, 2024
• Last Update Submitted That Met QC Criteria: September 11, 2024
• Last Verified: June 1, 2021

More Information

Terms related to this study

• Keywords: TTR; Amyloidosis; Polyneuropathy; Transthyretin; Amyloid; TTR-mediated amyloidosis; Amyloidosis, Hereditary, Transthyretin-Related; Familial Amyloid Polyneuropathies; ATTR-PN; Familial ATTR-PN; Amyloidosis, hereditary
• Additional Relevant MeSH Terms: Metabolic Diseases; Nervous System Diseases; Genetic Diseases, Inborn; Neuromuscular Diseases; Neurodegenerative Diseases; Peripheral Nervous System Diseases; Proteostasis Deficiencies; Metabolism, Inborn Errors; Heredodegenerative Disorders, Nervous System; Amyloidosis, Familial; Amyloidosis; Polyneuropathies; Amyloid Neuropathies; Amyloid Neuropathies, Familial
• Other Study ID Numbers: AG10-333; 2018-004670-10 (EudraCT Number)

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: Yes