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KPL-387

Phase 2

Pericarditis | Small molecule | Cardiovascular |Kiniksa Pharmaceuticals International, plc|Trials Updated: Oct 20, 2026

KPL-387 development status

Highest phase Phase 2
Registered trials 2 across 1 sponsor since Jun 2025

KPL-387 target and mechanism

Molecular targetIL-1R1
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials2
Total Enrollment445

FDA Designations

ORPHAN_DRUG

KPL-387 clinical trials

KPL-387 · 2 trials · 4 indications

Phase 2 2
NCT07288216Transition to KPL-387 Monotherapy Dosing & Administration StudyRecurrent Pericarditis
RECRUITING120 Analytics
NCT07010159Phase 2/3 Study of Participants With Recurrent Pericarditis Evaluating the Efficacy and Safety of KPL-387Pericarditis
RECRUITING325 Analytics
PHASE2RECRUITING
Transition to KPL-387 Monotherapy Dosing & Administration Study
Recurrent PericarditisUnlock trial analytics
PHASE2RECRUITING
Phase 2/3 Study of Participants With Recurrent Pericarditis Evaluating the Efficacy and Safety of KPL-387
PericarditisUnlock trial analytics

Study Endpoints

Primary Endpoints

Posology: Proportion of participants free from Pericarditis Recurrence by Week 16
From baseline up to Week 16
Long-Term Extension: Annualized rate of Pericarditis Recurrence through the end of the LTE.
Up to 24 Months
Phase 2: Time to Treatment Response by Week 24
From Baseline up to Week 24
Phase 3: Time to Pericarditis Recurrence
From Baseline in the RW Period
Long-Term Extension: Annualized rate of Pericarditis Recurrence
Up to 24 Months

Secondary Endpoints

Posology: Time to Pericarditis Recurrence by Week 16
From baseline up to Week 16
Long Term Extension: Change from LTE Baseline in SF-36v2 Physical Component Summary score through the end of the LTE
Up to 24 Months
Long Term Extension: Change from LTE Baseline in SF-36v2 Mental Component Summary score through the end of the LTE
Up to 24 Months
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Posology KPL-387EXPERIMENTALIn Posology Study, KPL-387 will be administered by subcutaneous (SC) injection through Week 16.
Long-Term ExtensionEXPERIMENTALParticipants from Posology Study who continue into the Long-Term Extension will receive KPL-387 for up to 24 months or until KPL-387 is approved for commercial use in that region to treat pericarditis, whichever occurs first.
Phase 2 KPL-387 100mg SC q2wkEXPERIMENTALIn Phase 2 Treatment Period KPL-387 will be administered by subcutaneous (SC) injection every 2 weeks (q2wk) through Week 22.
Phase 2 KPL-387 100mg SC q4wkEXPERIMENTALIn Phase 2 Treatment Period, KPL-387 or placebo (alternating every 2 weeks) will be administered by SC injection q2wk through Week 22 to provide active drug administration every 4 weeks (q4wk) while maintaining treatment concealment.
Phase 2 KPL-387 300mg SC q2wkEXPERIMENTALIn Phase 2 Treatment Period KPL-387 will be administered by SC injection q2wk through Week 22.
Phase 2 KPL-387 300mg SC q4wkEXPERIMENTALIn Phase 2 Treatment Period, KPL-387 or placebo (alternating every 2 weeks) will be administered by SC injection q2wk through Week 22 to provide active drug administration q4wk while maintaining treatment concealment.
Phase 3 KPL-387 SCEXPERIMENTALRun-In (RI) Period: participants receive single-blind KPL-387 Randomized Withdrawal (RW) Period: eligible participants are randomized (1:1 KPL-387 or placebo) to receive double-blinded KPL-387.
Phase 3 Placebo SCPLACEBO_COMPARATORRW Period: eligible participants are randomized (1:1 KPL-387 or placebo) to receive double-blinded placebo.

Interventions

NameTypeDescription
KPL-387DRUGadministered by subcutaneous injection
PlaceboDRUGadministered by subcutaneous injection
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Eligibility Criteria

Age Range18 Years to 80 Years
SexALL
Healthy VolunteersNo
Study Sites47

Key Inclusion Criteria: * Has well-controlled recurrent pericarditis (i.e., including having CRP \< 0.5 mg/dL within 14 days of Baseline and a pericarditis pain NRS score ≤ 3 at Baseline) * Has a documented history of CRP elevation (\> 1 mg/dL) associated with at least one prior acute pericarditis ...

Countries:United StatesCanadaFranceGermanyGreeceItalyPolandSerbiaSpainUnited Kingdom
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Recent Changes (Last 90 Days)

LOWOct 20, 2026NCT07288216lastUpdatePostDate: changed
LOWOct 20, 2026NCT07288216lastUpdatePostDate: changed
LOWOct 19, 2026NCT07010159lastUpdatePostDate: changed
LOWOct 19, 2026NCT07010159lastUpdatePostDate: changed
LOWOct 19, 2026NCT07010159lastUpdatePostDate: changed
LOWSep 30, 2026NCT07288216Enrollment: 80 → 120
LOWSep 30, 2026NCT07288216Enrollment: 80 → 120
LOWAug 26, 2026NCT07010159lastUpdatePostDate: changed
LOWAug 26, 2026NCT07010159lastUpdatePostDate: changed
LOWAug 11, 2026NCT07288216lastUpdatePostDate: changed
LOWAug 11, 2026NCT07010159Enrollment: 165 → 325
LOWAug 11, 2026NCT07288216lastUpdatePostDate: changed
LOWAug 11, 2026NCT07010159Enrollment: 165 → 325

Frequently asked questions about KPL-387

What is KPL-387?

KPL-387 is an investigational small molecule being developed by Kiniksa Pharmaceuticals International, plc for the treatment of pericarditis and recurrent pericarditis. It is in Phase 2 clinical development and has received an orphan drug designation from the FDA. It is not yet approved for any indication.

What is KPL-387 used for in recurrent pericarditis?

KPL-387 is being studied for the treatment of pericarditis and recurrent pericarditis, inflammatory conditions affecting the sac surrounding the heart. Clinical development is focused on adults 18 years and older. The program includes a Phase 2/3 study evaluating efficacy and safety in participants with recurrent pericarditis.

What does KPL-387 target?

KPL-387 targets IL-1R1, the type 1 interleukin-1 receptor. By binding this receptor, the small molecule is designed to block interleukin-1 signaling, a pathway involved in the inflammation that drives pericarditis and recurrent pericarditis. Targeting IL-1R1 is the mechanism under investigation in the ongoing clinical program.

Who makes KPL-387?

KPL-387 is being developed by Kiniksa Pharmaceuticals International, plc, which trades on the Nasdaq under the ticker KNSA. Kiniksa is the sponsor of the clinical program studying the drug in pericarditis and recurrent pericarditis.

What phase is KPL-387 in?

KPL-387 is in Phase 2 clinical development. It is investigational and has not been approved by the FDA for any indication. The program includes a Phase 2/3 study in recurrent pericarditis and a Phase 2 monotherapy dosing and administration study, both currently recruiting participants.

What clinical trials is KPL-387 in?

KPL-387 is being evaluated in two recruiting studies. NCT07010159 is a Phase 2/3 study of participants with recurrent pericarditis, with planned enrollment of 325. NCT07288216 is a Phase 2 transition to KPL-387 monotherapy dosing and administration study, with planned enrollment of 120. Both are randomized, double-blind, and placebo-controlled.