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Alpha1-Antitrypsin DeficiencyPhase 1/2NCT04722887

A Study to Evaluate Safety, Tolerability and Pharmacokinetics of Two Different Doses of Alpha1-Proteinase Inhibitor Subcutaneous (Human) 15% in Participants With Alpha1-Antitrypsin Deficiency

A Phase 1/2 study testing Alpha-1 15% and Liquid Alpha1-Proteinase Inhibitor (Human) in people with Alpha1-Antitrypsin Deficiency, run by Grifols Therapeutics LLC at 5 sites in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The purpose of this study is to evaluate the safety and tolerability of 72 milligrams per kilogram (mg/kg) and 180 mg/kg Alpha-1 15%, administered as a single-dose subcutaneous (SC) infusion and subsequently as weekly SC infusions over 8 weeks in participants with Alpha1-Antitrypsin Deficiency (AATD). Read more about this study

Who is it for?
Ages 18 to 80 years
Conditions the study is for
Alpha1-Antitrypsin Deficiency
What is being tested?
Alpha-1 15% and Liquid Alpha1-Proteinase Inhibitor (Human)
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
17 participants
Where
5 sitesUnited States
Study dates
16 Dec 2021to 1 Aug 2025
Phase
Phase 1/2
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 80 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Main Inclusion Criteria:

  • Have a diagnosis of congenital Alpha1-antitrypsin deficiency (AATD) with an allelic combination of ZZ, SZ, Z(null), (null)(null), S(null), or "at-risk" alleles (subjects with "at-risk" alleles must be individually evaluated for eligibility by the Medical Monitor).
  • Have a documented pre-Alpha1-Proteinase Inhibitor (PI) augmentation therapy serum alpha-1 antitrypsin (AAT) level <11 micromolar (μM) (80 milligrams per decilitre (mg/dL) if measured by radial immunodiffusion or 50 mg/dL if measured by nephelometry).
  • Subjects may be naïve to Alpha1-PI augmentation therapy or may be currently receiving Alpha1-PI augmentation therapy or received Alpha1-PI augmentation therapy within the past. If the subject is currently receiving Alpha1-PI augmentation therapy of any kind, he/she must be willing to discontinue that treatment for at least 25 days prior to the Week 1 (Baseline) Visit and remain off any kind of Alpha1-PI treatment, other than the IPs for this study, while participating in the study.
  • At the Screening Visit, have a post-bronchodilator forced expiratory volume (FEV1) ≥30% and <80% of predicted and FEV1/forced vital capacity (FVC) <70% (Global Initiative for Chronic Obstructive Lung Disease (GOLD) stage II or III).

Main Exclusion Criteria:

  • Have had a moderate or severe Chronic obstructive pulmonary disease (COPD) exacerbation during the 4 weeks before the Week 1 (Baseline) Visit.
  • Have history of lung or liver transplant.
  • Have any lung surgery during the past 2 years (excluding lung biopsy).
  • Have severe concomitant disease (example, congestive heart failure, clinically significant pulmonary fibrosis, malignant disease [except for skin cancers other than melanoma], history of acute hypersensitivity pneumonitis reaction, or current chronic hypersensitivity pneumonitis).
  • Females who are pregnant, breastfeeding or, if of child-bearing potential, unwilling to practice a highly effective method of contraception (oral, injectable, or implanted hormonal methods of contraception, placement of an intrauterine device (IUD) or intrauterine system (IUS), condom or occlusive cap with spermicidal foam/gel/film/cream/suppository, male sterilization, or true abstinence) throughout the study.
  • Have smoked during the past 6 months or a positive urine cotinine test at the Screening Visit that is due to smoking.
  • Participate in another Investigational product (IP) study within one month prior to the Week 1 (Baseline) Visit.
  • Have history of anaphylaxis or severe systemic response to any plasma-derived Alpha1-PI preparation or other blood product(s).
  • Use systemic steroids above a stable dose equivalent to 5 mg/day prednisone (i.e., 10 mg every 2 days) within the 4 weeks prior to the Week 1 (Baseline) Visit. It is recommended to maintain the same dose throughout the study.
  • Use systemic or aerosolized antibiotics for a chronic COPD exacerbation within the 4 weeks prior to the Week 1 (Baseline) Visit.
  • Have known selective or severe Immunoglobulin A (IgA) deficiency.

Trial locations and contacts

5 sites in 1 country.

5 sites in 1 country

United States5 sites
  • GC2008 Study Site 101

    Charleston, South Carolina, 29425

  • GC2008 Study Site 103

    Cleveland, Ohio, 44195

  • GC2008 Study Site 108

    Gainesville, Florida, 32610

  • GC2008 Study Site 107

    Los Angeles, California, 90025

  • GC2008 Study Site 102

    Miami, Florida, 33136

Other trials in United States

About this study

Official title: A Multi-Center, Single-Dose and Repeat-Dose Over Eight Weeks, Sequential Cohort Study to Evaluate Safety and Tolerability as Well as Pharmacokinetics of Two Different Doses of Alpha1-Proteinase Inhibitor Subcutaneous (Human) 15% Administered Subcutaneously in Subjects With Alpha1-Antitrypsin Deficiency

The purpose of this study is to evaluate the safety and tolerability of 72 milligrams per kilogram (mg/kg) and 180 mg/kg Alpha-1 15%, administered as a single-dose subcutaneous (SC) infusion and subsequently as weekly SC infusions over 8 weeks in participants with Alpha1-Antitrypsin Deficiency (AATD).

Being tested
Alpha-1 15%, Liquid Alpha1-Proteinase Inhibitor (Human)
Keywords
Pulmonary Emphysema, Alpha-1 Antitrypsin Deficiency, AATD, Alpha-1 PI Deficiency, Alpha-1 Proteinase Inhibitor, Emphysema, Pathologic Processes, Pulmonary Disease, Chronic Obstructive, Lung Diseases, Obstructive, Lung Diseases, Respiratory Tract Diseases, Liver Diseases, Digestive System Diseases, Genetic Diseases, Inborn, Subcutaneous Emphysema, Alpha1-Antitrypsin, Trypsin Inhibitors, Serine Proteinase Inhibitors, Protease Inhibitors, Enzyme Inhibition
Medical subject headings
alpha 1-Antitrypsin Deficiency, Pulmonary Emphysema, Emphysema, Pathologic Processes, Pulmonary Disease, Chronic Obstructive, Lung Diseases, Obstructive, Lung Diseases, Respiratory Tract Diseases

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Alpha-1 15%Biological

    Alpha1-Proteinase Inhibitor (Human), 15%, Subcutaneous infusion

  • Liquid Alpha1-Proteinase Inhibitor (Human)Biological

    Also called Prolastin®-C Liquid

    Intravenous infusion

Study groups in NCT04722887
Study groupRoleWhat they receive
Cohort 1: Treatment Period 1 (Alpha-1 15%, 72 mg/kg)ExperimentalParticipants will receive Alpha-1 15% 72 mg/kg, single subcutaneous (SC) infusion in treatment-period 1 (Single-Dose) at Week 1.
Receives: Biological: Alpha-1 15%
Cohort 1: Single-Dose Data Evaluation Period (Liquid Alpha 1-Proteinase Inhibitor 60 mg/kg)ExperimentalFollowing the week-long treatment period 1, participants in Cohort 1 will enter 21 days of washout/serial pharmacokinetic (PK) phase and then the single-dose data evaluation period. During the single-dose data evaluation period, Liquid Alpha1- Proteinase Inhibitor (PI) 60 mg/kg, weekly intravenous (IV) Infusions will be administered from intravenous-dose Week 1 (single-dose Week 5) for up to Week 78, with the last IV dose given 1 week prior to the first repeat Alpha-1 15% SC dose.
Receives: Biological: Liquid Alpha1-Proteinase Inhibitor (Human)
Cohort 1: Treatment Period 2 (Alpha-1 15%, 72 mg/kg)ExperimentalFollowing treatment period 1 and single-dose data evaluation period, participants in Cohort 1 will enter treatment period 2 (Repeat-Dose) and will receive Alpha-1 15% 72 mg/kg, for 8 weekly SC infusions.
Receives: Biological: Alpha-1 15%
Cohort 2: Treatment Period 1 (Alpha-1 15%, 180 mg/kg)ExperimentalParticipants will receive Alpha-1 15% 180 mg/kg, single SC infusion in treatment-period 1 (Single-Dose) at Week 1.
Receives: Biological: Alpha-1 15%
Cohort 2: Single-Dose Data Evaluation Period (Liquid Alpha1-Proteinase Inhibitor 120 mg/kg)ExperimentalFollowing the week-long treatment period 1, participants in Cohort 2 will enter 21 days of washout/serial pharmacokinetic (PK) phase and then the single-dose data evaluation period. During the single-dose data evaluation period, Liquid Alpha1-PI 120 mg/kg, weekly IV Infusions will be administered from intravenous-dose Week 1 (single-dose Week 5) for up to Week 78, with the last IV dose given 1 week prior to the first repeat Alpha-1 15% SC dose.
Receives: Biological: Liquid Alpha1-Proteinase Inhibitor (Human)
Cohort 2: Treatment Period 2 (Alpha-1 15%, 180 mg/kg)ExperimentalFollowing treatment period 1 and single-dose data evaluation period, participants in Cohort 2 will enter treatment period 2 (Repeat-Dose) and will receive Alpha-1 15% 180 mg/kg, for 8 weekly SC infusions.
Receives: Biological: Alpha-1 15%

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Number of Participants With Treatment Emergent Adverse Events (TEAEs)

    AE that occurred at any time from the beginning of IP administration until the final visit of the clinical trial was considered TEAE.

    Measured: Up to 668 days

  2. Number of Participants With Suspected Adverse Drug Reactions (ADRs)

    All noxious and unintended responses to a medicinal product or study treatment related to any dose was considered suspected ADRs. The phrase "responses to a medicinal product" means that a causal relationship between a medicinal product or study treatment and an AE is at least a reasonable possibility.

    Measured: Up to 668 days

  3. Number of Participants With Infusion Site Reactions (ISRs)

    Treatment-emergent ISRs have onset on or after date of the first administration of study treatment up to on or before 28 days after last administration of study treatment. An ISR was counted in the period during which it started.

    Measured: Up to 668 days

  4. Number of Participants With Serious Adverse Events (SAEs)

    An adverse event is considered serious if, in the judgment of the investigator or sponsor, it results in death, is life-threatening, requires hospitalization or prolongs an existing hospitalization (admission for 24 hours or more, including emergency room stays), causes significant or persistent disability, results in a congenital anomaly or birth defect, or is an important medical event that may jeopardize the subject or require intervention to prevent these outcomes.

    Measured: Up to 668 days

  5. Number of Participants With Any TEAE Leading to Study Withdrawal

    TEAE Leading to Study Withdrawal refers to a TEAE that results in a participant permanently discontinuing or withdrawing from a clinical study because of the adverse event.

    Measured: Up to 668 days

  6. Number of Participants With Chronic Obstructive Pulmonary Disease (COPD) Exacerbations

    The definition of an exacerbation of COPD is an increase in respiratory symptoms (dyspnea, increased cough, and/or production of sputum) over baseline that usually requires medical intervention.

    Measured: Up to 668 days

  7. Number of Participants With Any Adverse Events Associated With Abnormalities in Vital Signs (Heart Rate, Blood Pressure, Respiratory Rate, and Temperature)

    Clinically significant vital sign abnormalities were presented as adverse events, with clinical relevance based on the Investigator's judgment.

    Measured: Up to 668 days

  8. Change From Baseline in Forced Expiratory Volume in 1 Second (FEV1)

    FEV1 was performed according to ATS/ERS guidelines. At each visit, testing was performed both pre- and post-bronchodilator (BD) administration.

    Measured: Single-Dose Week 5/Intravenous Week 1, and Repeat-Dose Weeks 1, 4, and 9

  9. Change From Baseline in Forced Vital Capacity (FVC)

    FVC was performed according to ATS/ERS guidelines. At each visit, testing was performed both pre- and post-bronchodilator (BD) administration.

    Measured: Single-Dose Week 5/Intravenous Week 1, and Repeat-Dose Weeks 1, 4, and 9

  10. Number of Participants With Any Adverse Events Associated With Abnormalities in Laboratory Parameters (Chemistry, Hematology, Urinalysis)

    Out of the normal range laboratory results judged by the Investigator as clinically significant in the context of the participant's medical history were considered adverse events.

    Measured: Up to 668 days

  11. Immunogenicity: Number of Participants With Alpha1-PI Antibodies

    Immunogenicity testing was performed using validated assays in a multi-tiered approach.

    Measured: Treatment Period 1- Single-Dose Week 1; Treatment Period 2- Repeat-Dose Weeks 1 and 9

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted25 Jan 2021
  2. Study start16 Dec 2021
  3. Primary completion1 Aug 2025
  4. Study completion1 Aug 2025

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1/2
Primary purpose
Treatment
Allocation
Non-randomised
Intervention model
Sequential
Masking
None (open label)
Enrolment
17 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04722887
Sponsor's protocol ID
GC2008
Status last verified
Sep 2026
First submitted
20 Jan 2021
Last updated
8 Oct 2026
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 1/2 study testing Alpha-1 15% and Liquid Alpha1-Proteinase Inhibitor (Human) in people with Alpha1-Antitrypsin Deficiency, run by Grifols Therapeutics LLC at 5 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 8 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 5 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this combined phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 8 Oct 2026). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Number of Participants With Treatment Emergent Adverse Events (TEAEs) (time frame: Up to 668 days). The study lists 11 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 8 Oct 2026.

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