Efficacy and Safety of AG10 in Subjects with Transthyretin Amyloid Polyneurophathy

NCT ID: NCT04418024

Last Updated: 2024-09-19

Basic Information

• Recruitment Status: WITHDRAWN
• Clinical Phase: PHASE3
• Study Classification: INTERVENTIONAL
• Study Start Date: 2020-10-21
• Study Completion Date: 2024-04-30

Brief Summary

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)

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.

Conditions

Transthyretin-Related (ATTR) Familial Amyloid Polyneuropathy

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: TRIPLE

Study Groups

AG10 800 mg

TTR stabilizer administered orally twice daily (BID)

Group Type: EXPERIMENTAL

AG10

Intervention Type: DRUG

TTR stabilizer administered orally twice daily (BID)

Placebo

Placebo administered orally twice daily (BID)

Group Type: PLACEBO_COMPARATOR

Placebo

Intervention Type: DRUG

Non-active control

Interventions

AG10

TTR stabilizer administered orally twice daily (BID)

Intervention Type: DRUG

Placebo

Non-active control

Intervention Type: DRUG

Other Intervention Names

Oral AG10; Placebo Oral Tablet

Eligibility Criteria

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

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 90 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Eidos Therapeutics, a BridgeBio company

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Mark McGovern, RN, CCRN

Role: STUDY_DIRECTOR

Eidos Therapeutics, a BridgeBio company

Locations

Eidos Therapeutics

San Francisco, California, United States

Countries

United States

Other Identifiers

2018-004670-10

Identifier Type: EUDRACT_NUMBER

Identifier Source: secondary_id

AG10-333

Identifier Type: -

Identifier Source: org_study_id