Recent Updates
Recently added Catalysts

KB408

Phase 1

Alpha 1-Antitrypsin Deficiency | Small molecule | Rare Disease |Krystal Biotech, Inc.|Trials Updated: Jul 22, 2025

KB408 target and mechanism

Molecular targetSERPINA1
ModalitySmall molecule

Also known as KB408 (Nebulization)

Success Probability

Subscribe to view

Market & Valuation

Subscribe to view

Trial Design

CONTROLLED
Total Trials1
Total Enrollment15

FDA Designations

ORPHAN_DRUG

KB408 clinical trials

KB408 · 1 trial · 1 indication

Phase 1 1
NCT06049082A Study of KB408 for the Treatment of Alpha-1 Antitrypsin DeficiencyAlpha 1-Antitrypsin Deficiency
RECRUITING15 Analytics
PHASE1RECRUITING
A Study of KB408 for the Treatment of Alpha-1 Antitrypsin Deficiency
Alpha 1-Antitrypsin DeficiencyUnlock trial analytics

Study Endpoints

Primary Endpoints

To evaluate safety and tolerability of KB408 based upon assessment of adverse events (frequency, severity, relatedness), and changes from baseline in vital signs, ECG, spirometry, and clinical laboratory test results
2 months (Cohorts 1, 2, 3); 3 months (Cohort 2b)

Number of subjects with treatment related adverse events as assessed by NCI-CTCAE v5

Secondary Endpoints

To assess the effect of KB408 on serum alpha-1 antitrypsin (AAT) concentration
2 months (Cohorts 1, 2, 3); 3 months (Cohort 2b)
To assess the effect of KB408 on plasma neutrophil elastase (NE) concentration
2 months (Cohorts 1, 2, 3); 3 months (Cohort 2b)
To evaluate the effect of KB408 on AAT concentration in the lung
2 months (Cohorts 1, 2, 3); 3 months (Cohort 2b)
Unlock Study Endpoints

Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1: Low dose KB408EXPERIMENTALSingle dose of KB408 (low dose)
Cohort 2: Mid dose KB408EXPERIMENTALSingle dose of KB408 (mid dose)
Cohort 3: High dose KB408EXPERIMENTALSingle dose of KB408 (high dose)
Cohort 2b: Mid dose KB408EXPERIMENTALMultiple doses of KB408 (mid dose)

Interventions

NameTypeDescription
KB408 (Nebulization)DRUGNebulized solution of KB408, a replication-defective HSV-1 vector expressing full length human SERPINA1
Unlock Study Design Details

Eligibility Criteria

Age Range18 Years to 70 Years
SexALL
Healthy VolunteersNo
Study Sites3

Inclusion Criteria: 1. The subject or legally authorized representative must have read, understood, and signed an Institutional Review Board (IRB) approved Informed Consent Form and must be willing and able to comply with study procedures and instructions. 2. Subject is aged ≥18 to ≤70 years, at th...

Countries:United States
Unlock Eligibility Criteria

Frequently asked questions about KB408

What is KB408 used for in Alpha 1-Antitrypsin Deficiency?

KB408 is an investigational therapy being developed for the treatment of Alpha 1-Antitrypsin Deficiency, a rare genetic condition. It is currently in Phase 1 clinical development and has not been approved by the FDA. The drug is administered via nebulization and is being studied in a clinical trial in the United States.

What does KB408 target?

KB408 targets the SERPINA1 gene, which encodes alpha-1 antitrypsin, a protein that protects the lungs and liver. By targeting SERPINA1, KB408 aims to address the underlying deficiency in patients with Alpha 1-Antitrypsin Deficiency. The therapy is designed for nebulized delivery to the lungs.

Who makes KB408?

KB408 is being developed by Krystal Biotech, Inc., a biopharmaceutical company traded on the stock exchange under the ticker symbol KRYS. The company is conducting a Phase 1 clinical trial to evaluate KB408 for the treatment of Alpha 1-Antitrypsin Deficiency.

What phase is KB408 in?

KB408 is in Phase 1 clinical development. It is an investigational drug and has not been approved by the FDA. The ongoing Phase 1 trial is actively recruiting participants in the United States to study the safety and effects of KB408 in patients with Alpha 1-Antitrypsin Deficiency.

What clinical trials is KB408 in?

KB408 is being studied in a Phase 1 clinical trial with the identifier NCT06049082, titled "A Study of KB408 for the Treatment of Alpha-1 Antitrypsin Deficiency." This trial is recruiting 15 participants aged 18 years and older in the United States. The study is controlled but not randomized or double-blinded.

Is KB408 the same as KB408 (Nebulization)?

Yes, KB408 is also known as KB408 (Nebulization), reflecting its method of administration. The drug is delivered via nebulization, which involves inhaling a mist. This alternative name is used in clinical contexts to specify the route of administration for the therapy.