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PF-06823859

Phase 3

Myositis | Small molecule | Immunology |Pfizer, Inc.|Last Updated: Jun 1, 2026

Success Probability

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment318

FDA Designations

No designations recorded

Clinical trial landscape

PF-06823859 · 3 trials · 2 indications

Phase 3 1Phase 1 2
NCT05895786A Study to Understand How the Study Medicine (PF-06823859) Works in People With Active Idiopathic Inflammatory Myopathies [Dermatomyositis (DM) and Polymyositis (PM)]Myositis
RECRUITING318 Analytics
PHASE3RECRUITING
A Study to Understand How the Study Medicine (PF-06823859) Works in People With Active Idiopathic Inflammatory Myopathies [Dermatomyositis (DM) and Polymyositis (PM)]
MyositisUnlock trial analytics

Study Endpoints

Primary Endpoints

Moderate change in Total Improvement Score (TIS)
24 weeks outside of the United States (US) and 52 weeks in the US

Total Improvement Score 0 to 100 with higher scores indicating a better outcome.

Number of Participants With Treatment Emergent Adverse Events (AEs) and Serious Adverse Events (SAEs)
Day 1 up to maximum of Day 157

Adverse event (AE) was any untoward medical occurrence in a participant temporally associated with the use of study intervention, whether or not considered related to the study intervention. SAE was any untoward medical occurrence that at any dose resulted in any of following outcomes/deemed significant for any other reason: death; initial /prolonged inpatient hospitalization; life-threatening; persistent or significant disability/incapacity; congenital anomaly/birth defect and suspected transmission via a Pfizer product of an infectious agent, pathogenic or non-pathogenic. TEAEs were the events between first dose of study drug and up to Day 157, that were absent before treatment or that worsened relative to pretreatment state. AEs included both serious (if occurred) and all non-serious adverse events.

Number of Participants With Infusion Related Reaction (IRR)
Day 1 up to maximum of Day 157

IRR included AEs potentially related to infusion related reaction and was determined by blind medical review prior to the database release.

Number of Participants With Infusion Site Reaction
From start of study intervention infusion up to 60 minutes on Day 1

Participants were monitored from start of study intervention infusion until the end of infusion to assess the infusion sites for erythema, induration, ecchymosis, pain, and pruritus, or other observed characteristics after study intervention.

Number of Participants With Viral Infection
Day 1 up to maximum of Day 157
Number of Participants With Laboratory Test Abnormalities
Day 1 up to maximum of Day 157

Laboratory test abnormalities included hematology: basophils/leukocytes greater than (\>)1.2\* upper limit of normal (ULN), eosinophils/leukocytes \>1.2\* ULN, monocytes/leukocytes \>1.2\* ULN; clinical chemistry: bilirubin \> 1.5\* ULN, aspartate aminotransferase \>3.0\* ULN, urate \>1.2\* ULN; urinalysis: ketones greater than or equal to (\>=)1, urine hemoglobin \>=1.

Number of Participants With Vital Sign Abnormalities of Pre-defined Criteria
From baseline (pre-dose measurement at Day 1) up to Day 157

Vital sign abnormalities were categorized as: a) supine systolic blood pressure: minimum: less than (\<) 90 millimeter of mercury (mmHg), maximum decrease from baseline: greater than or equal to (\>=) 30 mmHg, maximum increase from baseline: \>=30 mmHg; b) supine diastolic blood pressure: minimum: \<50 mmHg, maximum decrease from baseline: \>=20 mmHg, maximum increase from baseline: \>=20 mmHg; c) supine pulse rate: minimum \<40 beats per minute (bpm), maximum \>120 bpm. Number of participants with any vital sign abnormality were reported in this outcome measure.

Number of Participants With Electrocardiogram (ECG) Abnormalities of Pre-defined Criteria
From baseline (pre-dose measurement at Day 1) up to Day 157

Criteria for ECG abnormalities: maximum PR interval \>=300 milliseconds (msec); maximum increase in PR interval from baseline \>=25 percent (%) for baseline value of \>200 msec; maximum increase in PR interval from baseline \>=50% for baseline value of less than or equal to (\<=) 200 msec; maximum QRS interval \>=140 msec and maximum increase from baseline \>=50%; QT interval of \>=500 msec; QTcF interval (Fridericia's Correction of QTc interval) mild: \>=450 msec to \<480 msec, moderate: \>=480 msec to \<500 msec; increase from baseline \>=30 msec to \<60 msec and severe: \>=500 msec; increase from baseline \>=60 msec.

Number of Participants With Treatment Emergent Treatment-Related Adverse Events (AEs
Dosing through approximately Day 189

Safety

Secondary Endpoints

Change from baseline in Manual Muscle Testing - 8 designated muscles (MMT-8)
24 weeks outside of the US and 52 weeks in the US
Change from baseline in Cutaneous Dermatomyositis Disease Area and Severity Index Activity Score (CDASI-A) in participants with dermatomyositis (DM)
Week 24 outside the US
Change from baseline in Investigator Global Assessment severity scale (IGA) in participants with dermatomyositis
24 and 52 weeks in the US only
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
PF-06823859EXPERIMENTALParticipants will receive PF-06823859 via intravenous infusion every 4 weeks.
PlaceboPLACEBO_COMPARATORParticipants will receive placebo via intravenous infusion every 4 weeks.
PF-06823859 lowEXPERIMENTALParticipants will receive single intravenous infusion.
PF-06823859 highEXPERIMENTALParticipants will receive single intravenous infusion.
Placebo injection SC/IVPLACEBO_COMPARATORPlacebo for injection SC/IV

Interventions

NameTypeDescription
PF-06823859DRUGanti-interferon beta therapy
PlaceboDRUGPlacebo for PF-06823859
Placebo injection SC/IVDRUGComparison of Placebo to different doses of PF-06823859
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites146

Inclusion Criteria: * Male or female adults (≥18 years old or minimum legal adult age as defined per local regulation, whichever is greater) * Active dermatomyositis (DM) or polymyositis (PM) with age of onset * 18 years old. * Must be receiving a stable dose of standard of care (SOC) background...

Countries:United StatesArgentinaBulgariaChinaFranceGermanyHungaryIndiaIsraelItalyJapanMexicoPolandSlovakiaSouth KoreaSpainSwedenTaiwanTurkey (Türkiye)United Kingdom
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Frequently asked questions about PF-06823859

What is PF-06823859 used for?

PF-06823859 is an investigational small molecule being studied for the treatment of myositis, specifically active idiopathic inflammatory myopathies including dermatomyositis (DM) and polymyositis (PM). It has also been evaluated in healthy volunteers in earlier-phase trials to assess safety and pharmacokinetics.

Who makes PF-06823859?

PF-06823859 is being developed by Pfizer, Inc., a biopharmaceutical company traded on the New York Stock Exchange under the ticker symbol PFE. Pfizer is conducting clinical trials to evaluate the drug's safety, tolerability, and efficacy in patients with myositis.

What phase is PF-06823859 in?

PF-06823859 is currently in Phase 3 clinical development. A Phase 3 trial (NCT05895786) is recruiting participants with active idiopathic inflammatory myopathies. Earlier Phase 1 studies in healthy volunteers have been completed, and the drug remains investigational and not yet approved by regulatory authorities.

What clinical trials is PF-06823859 in?

PF-06823859 is being studied in a Phase 3 trial (NCT05895786) for myositis, with an enrollment of 318 participants across multiple countries. Two Phase 1 trials (NCT02766621 and NCT05037409) in healthy volunteers have been completed, evaluating safety, tolerability, pharmacokinetics, and immunogenicity.

Is PF-06823859 the same as PF-06823859?

PF-06823859 is the primary name used for this investigational drug in clinical trials. No alternative names have been reported in the available data, so it is consistently referred to as PF-06823859 across studies and publications.