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GB002

Phase 2

Pulmonary Arterial Hypertension | Small molecule | Cardiovascular |Gossamer Bio, Inc.|Last Updated: Apr 9, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindCONTROLLEDDMCBiomarker
Total Trials2
Total Enrollment82
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04816604Open-label Extension Study of GB002 in Adult Subjects With Pulmonary Arterial Hypertension (PAH)PHASE2 ACTIVE NOT_RECRUITING 74Apr 5, 2021Dec 1, 2027Apr 9, 202628 United States, Australia +5
NCT03926793Clinical Study of Inhaled GB002 for Treatment of WHO Group I Pulmonary Arterial HypertensionPHASE1 COMPLETED 8Feb 4, 2020May 5, 2021Sep 1, 202114 United States, United Kingdom
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Study Endpoints
Primary Endpoints
Number of Participants With Treatment Emergent Adverse Events
From first dose of study drug up to 80 months or availability of commercial product
Number of participants with Treatment-Related Adverse Events GB002 (Main study)
Up to 45 days

To evaluate the safety and tolerability of GB002

Number of participants with Treatment-Related Adverse Events GB002 (OLE study)
Up to 200 days

To evaluate the long-term safety and tolerability and efficacy of GB002

Secondary Endpoints
Change from Baseline Over Time on the Six-Minute Walk Test (6MWT)
Baseline, up to 80 months or availability of commercial product
Pharmacokinetics: Time to Reach Maximum Concentration (Tmax) of GB002 (Main study)
14 days
Pharmacokinetics: Maximum Concentration (Cmax) of GB002 (Main study)
14 days
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
GB002 (seralutinib)EXPERIMENTALGB002 (seralutinib) inhaled orally twice per day (BID)
Cohort 1EXPERIMENTALPatients will be randomized to receive inhaled GB002 or Placebo daily for 14 days
Cohort 2EXPERIMENTALPatients will be randomized to receive inhaled GB002 or Placebo daily for 14 days
Open Label ExtensionEXPERIMENTALEligible subjects may participate in the Open Label Extension (OLE) study for a period of 24 weeks.
Interventions
NameTypeDescription
GB002 (seralutinib)DRUGCapsule containing GB002 (seralutinib)
Generic Dry Powder InhalerDEVICEGeneric dry powder inhaler for GB002 (seralutinib) delivery
GB002DRUGGB002 low dose or high dose for inhalation
PlaceboDRUGPlacebo for inhalation
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Eligibility Criteria
Age Range18 Years — 80 Years
SexALL
Healthy VolunteersNo
Study Sites28

Inclusion Criteria: Type of Subject and Disease Characteristics 1. Subjects must have completed a prior GB002 PAH study and, in the opinion of the Investigator and Sponsor, have been compliant with study procedures and have completed treatment with IP through parent study end-of-treatment (EOT) vi...

Countries:United StatesAustraliaCzechiaFranceGermanySpainUnited Kingdom
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT04816604primaryCompletionDate: changed
LOWMay 24, 2026NCT04816604studyFirstPostDate: changed