A Study of PRX004 in Subjects With Amyloid Transthyretin (ATTR) Amyloidosis

NCT ID: NCT03336580

Last Updated: 2020-08-20

Basic Information

• Recruitment Status: TERMINATED
• Clinical Phase: PHASE1
• Total Enrollment: 21 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2018-04-05
• Study Completion Date: 2020-07-23

Brief Summary

A Phase 1, open-label study of intravenous (IV) PRX004 as a single agent in subjects with hereditary amyloid transthyretin (hATTR) amyloidosis. The study will consist of 3 phases and will enroll up to a total of 36 subjects. A 3+3 dose escalation component to determine the safety, tolerability, PK, PD, and MTD. An expansion component in anticipated PRX004 RP2D cohorts selected from the Dose Escalation Phase. An extended dosing component for eligible subjects from the Dose Escalation or Expansion phases.

Detailed Description

This Phase 1, open-label consists of 3 phases. The Dose Escalation Phase is a 3+3 dose escalation component to determine the safety, tolerability, PK, PD, and MTD of IV PRX004 when given as a single agent in up to 36 evaluable subjects with hATTR amyloidosis. The Expansion Phase is an expansion component in anticipated PRX004 RP2D cohorts selected from the Dose Escalation Phase (this may occur in addition to cohorts in which additional subjects were added due to the observation of a dose-limiting [DLT] in the Escalation Phase). The Long-term Extension (LTE) Phase is an extended dosing component for eligible subjects from the Dose Escalation or Expansion phases.

The Dose Escalation Phase will follow a standard 3+3 design, in which cohorts of 3 to 6 subjects with hATTR amyloidosis will be enrolled at each dose level to receive IV PRX004 once every 28 days, based on scheduling from Month 1-Day 1 for up to 3 doses. Each subject will participate in only 1 dose escalation cohort. The starting dose of PRX004 will be 0.1 mg/kg.

Dose escalation will occur after the third evaluable subject in a cohort has completed the first 28 days following the first administration of PRX004. Up to 6 dose levels of PRX004 may be investigated (0.1, 0.3, 1, 3, 10, and 30 mg/kg) if tolerable. In the event the starting dose of 0.1 mg/kg is not tolerated, the dose escalationwill be halted and the study stopped.

Each subject will receive a maximum of 3 infusions of PRX004 in the Dose Escalation Phase. Subjects who complete the Month 3-Day 22 Visit in the Dose Escalation or Expansion phases may be eligible to receive up to 15 additional PRX004 infusions in the LTE Phase.

Each subject will receive a maximum of 3 infusions of PRX004 in the Dose Escalation Phase. Subjects who complete the Month 3-Day 22 Visit in the Dose Escalation or Expansion phases may be eligible to receive up to 15 additional PRX004 infusions in the LTE Phase.

Subjects who completed the EOS Visit in the Dose Escalation Phase prior to implementation of Protocol Amendment 2 may re-enter the study in the LTE Phase if they meet specific inclusion/exclusion criteria.

Conditions

Amyloidogenic Transthyretin (ATTR) Amyloidosis

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

PRX004

Dose escalation in up to 6 dose levels

Expansion of previously studied cohort(s) from Dose Escalation

Extended dosing at RP2D

Group Type: EXPERIMENTAL

PRX004

Intervention Type: DRUG

PRX004 (0.1, 0.3, 1, 3, 10, and 30 mg/kg) IV every 28 days

PRX004 IV every 28 days at RP2D(s)

PRX004 IV every 28 days at RP2D(s)

Interventions

PRX004

PRX004 (0.1, 0.3, 1, 3, 10, and 30 mg/kg) IV every 28 days

PRX004 IV every 28 days at RP2D(s)

PRX004 IV every 28 days at RP2D(s)

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

1. Age ≥18 years

2. Ability to understand and willingness to sign an informed consent form prior to initiation of any study procedures

3. Diagnosis of amyloidosis determined by polarizing light microscopy of green birefringent material in Congo Red-stained tissue specimens; and confirmed diagnosis of ATTR amyloidosis by immunohistochemistry, mass spectrometry, documentation of an ATTR mutation by gene sequencing, or 99m technetium-3,3-diphosphono-1,2-propanodicarboxylic acid (99mTc-DPD) scans and/or technetium pyrophosphate (PYP) SPECT cardiac imaging. If scintigraphy is used for diagnosis then the grade must be 2 or greater, indicative of transthyretin amyloidosis-cardiomyopathy (ATTR-CM) (Gillmore, 2016)

4. Known TTR mutation

5. [Inclusion Criterion 5 removed in Amendment 2]

6. Patients receiving concomitant tafamidis or diflunisal may enroll in the study, providing the dose has been stable for the last 6 months

7. Karnofsky Performance Status (KPS) ≥60%

8. Adequate organ function, including all of the following:

1. Adequate bone marrow reserve, defined as the following: absolute neutrophil count ≥1.0 × 109/L; platelet count ≥100 × 109/L; hemoglobin ≥10 g/dL

2. Hepatic: total bilirubin ≤ 2 times the upper limit of normal (× ULN), transaminases (aspartate aminotransferase and/or alanine aminotransferase) ≤3 × ULN; alkaline phosphatase ≤5 × ULN

3. Renal: estimated glomerular filtration rate (eGFR) ≥45 mL/min/1.73 m2

9. If currently receiving a diuretic, must have been on a stable dose for at least 4 weeks prior to the first dose of study drug

10. Systolic blood pressure ≥90 mmHg and ≤180 mmHg

11. Subjects with cardiomyopathy must have an NT-proBNP ≥650 pg/mL and ≤5000 pg/mL (ie, ≥76.9 pmol/L and ≤591 pmol/L) or evidence of septal wall thickening >1.2 cm on echocardiogram

12. Must have a biopsy unless data are available from a previous one. The biopsy may be taken from any tissue or organ affected by ATTR amyloidosis (eg, skin, lip, abdominal fat pad, salivary gland), at the Investigator's discretion. Nerve biopsies are not required.

13. Women of childbearing potential must have 2 negative pregnancy tests during Screening, the second within 24 hours prior to the first administration of study drug, and must agree to use highly effective physician-approved contraception from Screening to 90 days following the last study drug administration

14. Male subjects must be surgically sterile or must agree to use highly effective physician-approved contraception from Screening to 90 days following the last study drug administration

15. Polyneuropathy Disability (PND) Score ≤IIIB

16. Neuropathy Impairment Score (NIS) ≥5 and ≤130

Exclusion Criteria

1. Amyloid light chain or other non-ATTR amyloidosis

2. Any past history of or present abuse of alcohol, diabetes, B12 or folate deficiencies, autoimmune diseases, hereditary disorders other than transthyretin (eg, Charcot-Marie-Tooth), uncontrolled hypothyroidism, or other etiologies for the peripheral neuropathy

3. Received prior liver transplant

4. Planned liver transplant during the study

5. Modified body mass index (mBMI) ≤600 kg/m2 × g/L

6. New York Heart Association (NYHA) Functional Class III-IV (Appendix 2)

7. LVEF ≤45%

8. Uncontrolled symptomatic orthostatic hypotension

9. Myocardial infarction, unstable or uncontrolled angina, severe uncontrolled ventricular arrhythmias, or electrocardiographic evidence of acute ischemia, within 6 months prior to the first dose of study drug

10. Any history of clinically significant sinus pauses on ECG

11. Sinus pauses >3 seconds in the day or sinus pauses >5 seconds at night during the 48-hour pre-dose cardiac monitoring (ie, prior to first dose of study drug)

12. Arrhythmia requiring treatment diagnosed during the 48-hour pre-dose cardiac monitoring (ie, prior to first dose of study drug). Note: subject could be reconsidered for entry into the study if appropriate treatment is obtained

13. Hospitalized for heart failure within the 12 weeks prior to the first dose of study drug

14. Uncontrolled infection, or active malignancy with the exception of the following:

• Adequately treated basal cell carcinoma, squamous cell carcinoma of the skin, or in situ cervical cancer
• Low risk prostate cancer with Gleason score <7 and prostate specific antigen <10 mg/mL
• Any other cancer from which the subject has been disease-free for ≥2 years

15. Clinically significant pleural effusion per Investigator (e.g., presence of pleural effusion ≥30% in either hemithorax)

16. History of Grade ≥3 hypersensitivity-associated AEs or hypersensitivities to other monoclonal antibodies or the excipients found in the PRX004 formulation

17. Known HIV infection or known hepatitis B or C virus carrier

18. Women who are pregnant or breastfeeding

19. Treatment with an investigational agent within 30 days or 5 half-lives (whichever is longer) prior to Month 1-Day 1

20. Any condition which could interfere with, or the treatment for which might interfere with, the conduct of the study or which would, in the opinion of the Medical Monitor or Investigator unacceptably increase the subject's risk by participating in the study

21. Treatment with patisiran or inotersen within 90 days or 5 halflives (whichever is longer) prior to Month 1-Day 1

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

Sponsors

Prothena Biosciences Limited

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Locations

Tufts Medical Center

Boston, Massachusetts, United States

Mayo Clinic Minnesota

Rochester, Minnesota, United States

Oregon Health and Science University

Portland, Oregon, United States

Penn Presbyterian Medical Center

Philadelphia, Pennsylvania, United States

Centro Hospitalar do Porto

Porto, , Portugal

Hospital Universitario Puerta de Hierro - Majadahonda

Majadahonda, Madrid, Spain

Umeå University Hospital

Umeå, , Sweden

Countries

United States; Portugal; Spain; Sweden

References

Capustin M, Frishman WH. Transthyretin Cardiac Amyloidosis and Novel Therapies to Treat This Not-so-rare Cause of Cardiomyopathy. Cardiol Rev. 2021 Sep-Oct 01;29(5):263-273. doi: 10.1097/CRD.0000000000000387.

Reference Type: DERIVED

PMID: 34397539 (View on PubMed)

Other Identifiers

2017-003521-15

Identifier Type: EUDRACT_NUMBER

Identifier Source: secondary_id

PRX004-101

Identifier Type: -

Identifier Source: org_study_id