Transition to KPL-387 Monotherapy Dosing & Administration Study

A Phase 2 Posology Study With Long-Term Extension in Participants With Well-Controlled Recurrent Pericarditis to Evaluate the Efficacy and Safety of Transition Regimens to KPL-387 Monotherapy From Standard Therapies

The primary objective of this study is to characterize the efficacy and safety of dosing regimens used to transition from prior pericarditis therapies to KPL-387 monotherapy in participants with well-controlled recurrent pericarditis on standard therapies.

Study Overview

• Status: Recruiting
• Conditions: Heart Diseases; Pericarditis; Recurrent Pericarditis
• Intervention / Treatment: Drug: KPL-387

Detailed Description

During the Posology (Dosing and Administration) Study, participants on oral pericarditis therapies alone (i.e., non-steroidal anti-inflammatory drugs [NSAIDs], colchicine, and/or glucocorticoids) and participants on Interleukin-1 (IL-1) pathway inhibition drugs will transition to KPL-387 per protocol guidelines. Participants will receive KPL-387 for up to 16 weeks in the Posology Study.

At study visits throughout the Posology Study, participants will be queried for symptoms of chest pain (and participants will fill out pericarditis pain numerical rating scale [NRS] scores) and will be assessed for physical signs (e.g., pericardial friction rub) and laboratory evidence of pericarditis activity (e.g., C-reactive protein [CRP]) as well as treatment tolerability and pharmacokinetics (PK). Participants experiencing new or worsening symptoms consistent with pericarditis will be managed per study protocol.

All active, enrolled participants in the Posology Study who have not completed an End of Treatment (EOT) Visit may be eligible to transition into the Long-Term Extension (LTE) following completion of the Week 16 Visit. The Week 16 Visit will serve as both a Posology Study End of Study Visit and a Baseline Visit for the LTE. Participants who choose not to participate in the LTE will complete an EOT Visit followed by a Safety Follow-Up until 8 weeks after the last KPL-387 dose administration.

The open-label LTE is designed to evaluate the long-term efficacy and safety of KPL-387 in recurrent pericarditis (RP). Treatment in the LTE may continue until the participant has received up to 24 months of treatment in the LTE or until KPL-387 is approved for commercial use in that region to treat pericarditis, whichever occurs first.

At study visits throughout the LTE, participants will be queried for symptoms of chest pain (and participants will fill out pericarditis pain NRS scores) and will be assessed for physical signs (e.g., pericardial friction rub) and laboratory evidence of pericarditis activity (e.g., CRP) as well as treatment tolerability and PK. Participants experiencing new or worsening symptoms consistent with pericarditis will be managed as described in the protocol.

• Study Type: Interventional
• Enrollment (Estimated): 80
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Clinical Project Manager; Phone Number: 781-431-9100; Email: clinicaltrials@kiniksa.com

Study Locations

• Canada
  • Ontario
    • Ottawa, Ontario, Canada, K1N 6N5
      • Recruiting
      • Investigational Site 010
• Greece
  • Nea Ionia, Greece, 142 33
    • Recruiting
    • Investigational Site 023
• Italy
  • Milan, Italy, 20157
    • Recruiting
    • Investigational Site 021
• Poland
  • Warsaw, Poland, 02-507
    • Recruiting
    • Investigational Site 020
• Spain
  • Barcelona, Spain, 08017
    • Recruiting
    • Investigational Site 019
  • Barcelona, Spain, 08035
    • Recruiting
    • Investigational Site 015
  • Madrid, Spain, 28034
    • Recruiting
    • Investigational Site 017
  • Madrid, Spain, 28850
    • Recruiting
    • Investigational Site 016
  • Valencia, Spain, 46015
    • Recruiting
    • Investigational Site 018
• United Kingdom
  • London, United Kingdom, EC1A 7BE
    • Recruiting
    • Investigational Site 012
  • London, United Kingdom, SE1 7EH
    • Recruiting
    • Investigational Site 007
  • London, United Kingdom, NW3 2QG
    • Recruiting
    • Investigational Site 022
• United States
  • California
    • Los Angeles, California, United States, 90048
      • Recruiting
      • Investigational Site 014
    • Santa Monica, California, United States, 90404
      • Recruiting
      • Investigational Site 002
  • Illinois
    • Chicago, Illinois, United States, 60611
      • Recruiting
      • Investigational Site 013
  • New York
    • New York, New York, United States, 10016
      • Recruiting
      • Investigational Site 011
    • New York, New York, United States, 10032
      • Recruiting
      • Investigational Site 003
  • Ohio
    • Cincinnati, Ohio, United States, 45219
      • Recruiting
      • Investigational Site 009
  • Texas
    • Austin, Texas, United States, 78705
      • Recruiting
      • Investigational Site 005
    • Houston, Texas, United States, 77030
      • Recruiting
      • Investigational Site 006
  • Virginia
    • Charlottesville, Virginia, United States, 22903
      • Recruiting
      • Investigational Site 004
    • Norfolk, Virginia, United States, 23507
      • Recruiting
      • Investigational Site 001
    • Richmond, Virginia, United States, 23284
      • Recruiting
      • Investigational Site 008

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

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 episode, whether the incident event or any pericarditis recurrence
• Has received treatment for RP for at least 3 months prior to Baseline with standard therapy(ies) and is currently on a stable dosing regimen including NSAIDs and/or colchicine, and/or glucocorticoids or an IL-1 pathway inhibitor (anakinra or rilonacept).

Key Exclusion Criteria:

• Has a diagnosis of pericarditis that is secondary to specific prohibited etiologies
• Has had a pericarditis recurrence in the last 3 months prior to Baseline
• Has received an investigational drug during the 4 weeks before study drug administration or is planning to receive an investigational drug at any time during the study.
• Has a history of active or untreated, latent tuberculosis (TB) prior to screening.
• Has a history of immunodeficiency.
• Has a history of immunosuppression, including positive human immunodeficiency virus (HIV) test results.
• Has chest x-ray at Screening or within 12 weeks before first study drug administration, with evidence of malignancy, abnormality consistent with prior or active TB infection or active infection.
• Has a history of malignancy of any organ system within the past 5 years before Screening (other than a successfully treated non-metastatic cutaneous squamous cell carcinoma or basal cell carcinoma and/or localized carcinoma in situ of the cervix).
• Has a known or suspected current active infection or a history of chronic or recurrent infectious disease (> 3 episodes in prior 12 months), including but not limited to, genitourinary infection, chest infection, sinusitis, or skin/soft tissue infection.
• Has had a serious infection, has been admitted to the hospital for an infection, or has been treated for a documented infection requiring antibiotics for a documented infection within 2 weeks prior to first study drug administration.
• Has had an organ transplant (except corneal transplant performed more than 3 months prior to first study drug administration).
• In the Investigator's opinion, has any other medical condition that could adversely affect the subject's participation or interfere with study evaluations.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Posology KPL-387; In Posology Study, KPL-387 will be administered by subcutaneous (SC) injection through Week 16.	Drug: KPL-387; administered by subcutaneous injection
Experimental: Long-Term Extension; Participants 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.	Drug: KPL-387; administered by subcutaneous injection

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Posology: Proportion of participants free from Pericarditis Recurrence by Week 16	From first administration of study drug up to Week 16
Long-Term Extension: Annualized rate of Pericarditis Recurrence through the end of the LTE.	Up to 24 Months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Posology: Time to Pericarditis Recurrence by Week 16		From first administration of study drug up to Week 16
Long Term Extension: Change from LTE Baseline in SF-36v2 Physical Component Summary score through the end of the LTE	SF-36 (36-item Short Form Survey) Physical Component determines participants' quality of life by assessing 1) limitations in physical functioning due to health problems; 2) limitations in usual role because of physical health problems; 3) bodily pain; 4) general health perceptions; Scores on each item are summed and averaged (range: 0=worst to 100=best) with higher scores indicating better health. Increases from baseline indicate improvement.	Up to 24 Months
Long Term Extension: Change from LTE Baseline in SF-36v2 Mental Component Summary score through the end of the LTE	SF-36 (36-item Short Form Survey) Mental Component determines participants' quality of life by assessing 1) vitality; 2) limitations in social functioning because of physical or emotional problems; 3) limitations in usual role due to emotional problems; and 4) general mental health. Scores on each item are summed and averaged (range: 0=worst to 100=best) with higher scores indicating better health. Increases from baseline indicate improvement.	Up to 24 Months
Long Term Extension: Change from LTE Baseline in EQ-5D-5L individual index scores over time through the end of the LTE	The EQ-5D-5L (EuroQol-5 Dimension 5-level) is a self-reported health status questionnaire that consists of 6 questions used to calculate a health utility score for use in health economic analysis. There are 2 components to the EQ-5D-5L: a 5-item health state profile that assesses mobility, self-care, usual activities, pain/discomfort, and anxiety/depression used to obtain an Index Utility Score, as well as a visual analogue scale (VAS) that measures health state. Individual and index scores range from 0 to 1, with low scores representing a higher level of dysfunction.	Up to 24 months
Long Term Extension: Change from LTE Baseline in EQ-5D-5L visual analog scale (VAS) over time through the end of the LTE.	The EQ-5D-5L (EuroQol-5 Dimension 5-level) is a self-reported health status questionnaire that consists of 6 questions used to calculate a health utility score for use in health economic analysis. There are 2 components to the EQ-5D-5L: a 5-item health state profile that assesses mobility, self-care, usual activities, pain/discomfort, and anxiety/depression used to obtain an Index Utility Score, as well as a VAS that measures health state. The VAS is designed to rate the participant's current health state on a scale from 0 to 100, where 0 represents the worst imaginable health state and 100 represents the best imaginable health state.	Up to 24 months

Collaborators and Investigators

• Sponsor: Kiniksa Pharmaceuticals International, plc
• Collaborators: Kiniksa Pharmaceuticals, GmbH

Study record dates

Study Major Dates

• Study Start (Actual): March 25, 2026
• Primary Completion (Estimated): December 31, 2027
• Study Completion (Estimated): December 31, 2029

Study Registration Dates

• First Submitted: December 2, 2025
• First Submitted That Met QC Criteria: December 15, 2025
• First Posted (Actual): December 17, 2025

Study Record Updates

• Last Update Posted (Actual): May 20, 2026
• Last Update Submitted That Met QC Criteria: May 18, 2026
• Last Verified: November 1, 2025

More Information

Terms related to this study

• Keywords: Recurrence; Recurrent; Recurrent Pericarditis; KPL-387
• Additional Relevant MeSH Terms: Cardiovascular Diseases; Pathologic Processes; Disease Attributes; Pathological Conditions, Signs and Symptoms; Recurrence; Heart Diseases; Pericarditis
• Other Study ID Numbers: KPL-387-C212; 2025-523234-66 (EudraCT Number)

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No