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Alpha-1 15%

Phase 3

Alpha 1 Antitrypsin Deficiency | Small molecule | Other |Grifols, S.A.|Last Updated: Aug 11, 2026

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Trial Design

RandomizedCONTROLLED
Total Trials1
Total Enrollment40

FDA Designations

No designations recorded

Clinical trial landscape

Alpha-1 15% · 2 trials · 2 indications

Phase 3 1Phase 1 1
NCT07555483A Non-inferiority Pharmacokinetic and Safety/Tolerability Study of Two Different Doses of Weekly SC Alpha1-PI 15% Compared With Corresponding Standard IV Alpha1-PI in Participants With Alpha1-Antitrypsin Deficiency (AATD)Alpha 1 Antitrypsin Deficiency
RECRUITING40 Analytics
PHASE3RECRUITING
A Non-inferiority Pharmacokinetic and Safety/Tolerability Study of Two Different Doses of Weekly SC Alpha1-PI 15% Compared With Corresponding Standard IV Alpha1-PI in Participants With Alpha1-Antitrypsin Deficiency (AATD)
Alpha 1 Antitrypsin DeficiencyUnlock trial analytics

Study Endpoints

Primary Endpoints

Steady-state AUC of alpha1-PI over the weekly dosing interval (from 0 to 7 days) (AUC0-7 days) in the IV Treatment Period 1 and in the SC Treatment Period 2 for both dose levels
Week 1 to Week 16
Number of Participants With Adverse Events (AEs)
Up to 668 days
Number of Participants With Suspected Adverse Drug Reactions (ADRs)
Up to 668 days
Number of Participants With Infusion Site Reactions
Up to 668 days
Number of Participants With Serious Adverse Events (SAEs)
Up to 668 days
Number of Participants With AEs and SAEs Leading to Discontinuation
Up to 668 days
Number of Participants With Chronic Obstructive Pulmonary Disease (COPD) Exacerbations
Up to 668 days
Number of Participants With Clinically Significant Abnormalities in Vital Signs (Heart Rate, Blood Pressure, Respiratory Rate, and Temperature)
Up to 668 days
Change from Baseline in Forced Expiratory Volume in 1 Second (FEV1)
Up to 668 days
Change from Baseline in Forced Vital Capacity (FVC)
Up to 668 days
Number of Participants With Clinically Significant Abnormalities in Laboratory Parameters (Chemistry, Hematology, Urinalysis)
Up to 668 days
Immunogenicity: Number of Participants With Alpha1-PI Antibodies
Treatment Period 1- Single-Dose Week 1; Treatment Period 2- Repeat-Dose Weeks 1 and 9

Secondary Endpoints

The average value of the steady-state trough alpha1-PI measurements obtained at Weeks 6, 7, 8, and 9 (Period 1)
Weeks 6, 7, 8 and 9
The average value of the steady-state trough alpha1-PI measurements obtained at Weeks 14, 15, 16, and 17 (Period 2)
Weeks 14, 15, 16 and 17
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Treatment Arm 1 (60 mg/kg/week of Liquid Alpha1-PI followed by 90 mg/kg/week of Alpha-1 15%)EXPERIMENTAL8 weeks of IV treatment with 60 mg/kg/week Liquid Alpha1-PI followed by 8 weeks of SC treatment with 90 mg/kg/week Alpha-1 15%
Treatment Arm 2 (120 mg/kg/week of Liquid Alpha1-PI followed by 180 mg/kg/week of Alpha-1 15%)EXPERIMENTAL8 weeks of IV treatment with 120 mg/kg/week Liquid Alpha1-PI followed by 8 weeks of SC treatment with 180 mg/kg/week Alpha-1 15%
Cohort 1: Treatment Period 1 (Alpha-1 15%, 72 mg/kg)EXPERIMENTALParticipants will receive Alpha-1 15% 72 mg/kg, single weekly subcutaneous (SC) infusion in treatment-period 1 (Single-Dose) at Week 1.
Cohort 1: Single-Dose Data Evaluation Period (Liquid Alpha 1-Proteinase Inhibitor 60 mg/kg)EXPERIMENTALFollowing 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 phase, 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.
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.
Cohort 2: Treatment Period 1 (Alpha-1 15%, 180 mg/kg)EXPERIMENTALParticipants will receive Alpha-1 15% 180 mg/kg, single weekly SC infusion in treatment-period 1 (Single-Dose) at Week 1.
Cohort 2: Single-Dose Data Evaluation Period (Liquid Alpha1-Proteinase Inhibitor 120 mg/kg)EXPERIMENTALFollowing treatment period 1, participants in Cohort 2 will enter 21 days of washout/serial pharmacokinetic (PK) phase and then the single-dose data evaluation phase. During the single-dose data evaluation phase, 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.
Cohort 2: Treatment Period 2 (Alpha-1 15%, 180 mg/kg)EXPERIMENTALFollowing treatment period 1 and single-dose data evaluation phase, 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.

Interventions

NameTypeDescription
Alpha-1 15%DRUGAlpha1-Proteinase Inhibitor Subcutaneous (Human), 15%
Liquid Alpha1-PIOTHERLiquid Alpha1-Proteinase Inhibitor (Human) for Intravenous infusion
Liquid Alpha1-Proteinase Inhibitor (Human)BIOLOGICALIntravenous infusion
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Eligibility Criteria

Age Range18 Years to 80 Years
SexALL
Healthy VolunteersNo
Study Sites22

Inclusion Criteria: * Have a diagnosis of congenital AATD with an allelic combination of ZZ, SZ, Z(null), (null)(null), S(null), or "at-risk" alleles (patients with "at-risk" alleles must be individually evaluated for eligibility by the Medical Monitor). If the genotype has yet to be documented, a ...

Countries:United StatesDenmarkGermanyIrelandNetherlandsPolandPortugalSpainSweden
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Recent Changes (Last 90 Days)

LOWAug 11, 2026NCT07555483lastUpdatePostDate: changed
LOWAug 11, 2026NCT07555483lastUpdatePostDate: changed
LOWJul 13, 2026NCT07555483lastUpdatePostDate: changed
LOWJul 13, 2026NCT07555483lastUpdatePostDate: changed

Frequently asked questions about Alpha-1 15%

What is Alpha-1 15% used for?

Alpha-1 15% is an investigational therapy for Alpha-1 Antitrypsin Deficiency (AATD), a genetic condition that can lead to lung and liver disease. It is being developed as a subcutaneous formulation of alpha1-proteinase inhibitor for patients with this deficiency. The drug is currently in Phase 3 clinical development and is not yet approved.

Who makes Alpha-1 15%?

Alpha-1 15% is being developed by Grifols, S.A., a biopharmaceutical company. Grifols is conducting clinical trials to evaluate the safety, tolerability, and pharmacokinetics of this subcutaneous alpha1-proteinase inhibitor in patients with Alpha-1 Antitrypsin Deficiency.

What phase is Alpha-1 15% in?

Alpha-1 15% is currently in Phase 3 clinical development. A Phase 3 study is recruiting participants to compare the pharmacokinetics and safety of weekly subcutaneous Alpha-1 15% with standard intravenous alpha1-proteinase inhibitor in patients with Alpha-1 Antitrypsin Deficiency.

What clinical trials is Alpha-1 15% in?

Alpha-1 15% is being studied in a Phase 3 trial with the identifier NCT07555483, which is recruiting 40 participants across multiple countries including the United States, Denmark, Germany, Ireland, Netherlands, Poland, Portugal, Spain, and Sweden. A Phase 1 trial, NCT04722887, has been completed.

How does Alpha-1 15% work?

Alpha-1 15% is an alpha1-proteinase inhibitor, a protein that helps protect lung tissue from damage caused by enzymes such as neutrophil elastase. In patients with Alpha-1 Antitrypsin Deficiency, this protein is deficient, and supplementation aims to restore protective levels to slow disease progression.