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Seralutinib

Phase 3

Pulmonary Arterial Hypertension | Small molecule | Cardiovascular |Gossamer Bio, Inc.|Last Updated: Jul 29, 2026

Target and mechanism

Molecular targetPDGFRB, PDGFRA, CSF1R, KIT
Target classInhibitor
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials2
Total Enrollment720

FDA Designations

No designations recorded

Clinical trial landscape

Seralutinib · 2 trials · 1 indication

Phase 3 2
NCT06274801Open-label Extension Study of Seralutinib in Adult Subjects With PAH (PROSERA-EXT)Pulmonary Arterial Hypertension
RECRUITING330 Analytics
NCT05934526Efficacy and Safety of Seralutinib in Adult Subjects With PAH (PROSERA)Pulmonary Arterial Hypertension
COMPLETED390 Analytics
PHASE3RECRUITING
Open-label Extension Study of Seralutinib in Adult Subjects With PAH (PROSERA-EXT)
Pulmonary Arterial HypertensionUnlock trial analytics
PHASE3COMPLETED
Efficacy and Safety of Seralutinib in Adult Subjects With PAH (PROSERA)
Pulmonary Arterial HypertensionUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence of treatment-emergent adverse events (TEAEs)
From baseline to end of study (up to 48 months or availability of commercial product)
Change in distance achieved on the six-minute walk test (6MWT), six-minute walk distance (Δ6MWD) from baseline to Week 24
Baseline to 24 weeks

Secondary Endpoints

Changes in distance achieved on the Six-Minute Walk Test (6MWT)
Baseline to Week 12, 24, 36, 48, and 60, and then every 16 weeks thereafter + 4 weeks post dose up to end of study (up to 48 months or availability of commercial product)
Changes in NT-proBNP
Baseline to Week 12, 24, 36, 48, and 60, and then every 16 weeks thereafter + 4 weeks post dose up to end of study (up to 48 months or availability of commercial product)
Time to first event of Clinical Worsening from first dose of Investigational Product (IP) through end of study
Baseline to 48 weeks
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Seralutinib 90 mgEXPERIMENTALSeralutinib inhaled orally twice per day (BID)
PlaceboPLACEBO_COMPARATORPlacebo inhaled orally twice daily (BID) up to 48 weeks

Interventions

NameTypeDescription
SeralutinibDRUGCapsule containing seralutinib
Gereic Dry Powder InhalerDEVICEGeneric dry powder inhaler for seralutinib delivery
PlaceboDRUGMatching capsule containing placebo
Generic Dry Powder InhalerDEVICEGeneric dry powder inhaler for seralutinib or placebo delivery
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites120

Inclusion Criteria: 1. Subjects must have completed a qualifying last visit in a prior seralutinib PAH study on investigational product (IP) and in accordance with the protocol. 2. Evidence of an informed consent document, signed and dated by the subject, indicating that the subject has been inform...

Countries:United StatesArgentinaAustraliaBelgiumBrazilCanadaChileColombiaCzechiaDenmarkFranceGermanyGreeceIrelandIsraelItalyJapanLatviaLithuaniaMexicoNetherlandsPolandPortugalRomaniaSaudi ArabiaSerbiaSingaporeSouth KoreaSpainUnited KingdomAustria
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Recent Changes (Last 90 Days)

LOWJul 29, 2026NCT06274801Status: ACTIVE_NOT_RECRUITING → RECRUITING
LOWJul 29, 2026NCT06274801Status: ACTIVE_NOT_RECRUITING → RECRUITING
MEDIUMJun 19, 2026NCT05934526TRIAL_REMOVED: changed
MEDIUMJun 19, 2026NCT05934526TRIAL_REMOVED: changed
MEDIUMJun 19, 2026NCT05934526TRIAL_REMOVED: changed

Frequently asked questions about Seralutinib

What is Seralutinib used for in Pulmonary Arterial Hypertension?

Seralutinib is an investigational small molecule being developed for the treatment of Pulmonary Arterial Hypertension (PAH) in adults. It is currently in Phase 3 clinical development and is not yet approved by regulatory authorities. The drug is being evaluated in randomized, double-blind, placebo-controlled trials to assess its efficacy and safety in this patient population.

What does Seralutinib target?

Seralutinib is a kinase inhibitor that targets PDGFRB, PDGFRA, CSF1R, and KIT. By inhibiting these molecular targets, it is designed to interfere with signaling pathways involved in the pathogenesis of Pulmonary Arterial Hypertension. This mechanism is being investigated in clinical trials to determine its therapeutic potential in PAH.

Who makes Seralutinib?

Seralutinib is being developed by Gossamer Bio, Inc., a biopharmaceutical company publicly traded under the ticker symbol GOSS. The company is conducting Phase 3 clinical trials to evaluate the drug's safety and efficacy in patients with Pulmonary Arterial Hypertension.

What phase is Seralutinib in?

Seralutinib is currently in Phase 3 clinical development for Pulmonary Arterial Hypertension. It is an investigational drug, meaning it has not been approved by the FDA or other regulatory agencies. Two Phase 3 trials are associated with the program, one completed and one actively recruiting patients.

What clinical trials is Seralutinib in?

Seralutinib is being studied in two Phase 3 trials. The first, NCT05934526, is a completed study with 390 participants evaluating efficacy and safety in PAH. The second, NCT06274801, is an open-label extension study with 330 participants that is currently recruiting. Both trials enroll adults aged 18 years and older.

Is Seralutinib the same as CHEMBL4650333?

Yes, Seralutinib is identified by the ChEMBL identifier CHEMBL4650333. This identifier is used in chemical and pharmaceutical databases to reference the compound. In clinical trial registries and scientific literature, the drug is primarily referred to as Seralutinib.