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M281

Phase 3

Generalized Myasthenia Gravis | Small molecule | Neurology |Johnson & Johnson|Trials Updated: Sep 25, 2026

M281 development status

Highest phase Phase 3 (NCT04951622)
Phase scored for JNJPhase 2
Registered trials 26 across 2 sponsors since Feb 2019

M281 target and mechanism

Molecular targetFcRn
Target classProtein
ModalitySmall molecule

Also known as Nipocalimab, JNJ-80202135, JNJ-86507083

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials17
Total Enrollment2,785

FDA Designations

No designations recorded

M281 clinical trials

M281 · 17 trials · 12 indications

Phase 3 7Phase 2 10
NCT07438496A Study of Nipocalimab in Adults With Moderate to Severe Systemic Lupus ErythematosusLupus Erythematosus, Systemic
RECRUITING600 Analytics
NCT07217587Comparative Efficacy of Nipocalimab and Efgartigimod in Participants With Generalized Myasthenia GravisMyasthenia Gravis
RECRUITING115 Analytics
NCT06533098A Study of Nipocalimab or Intravenous Immunoglobulin (IVIG) in Pregnancies At Risk of Fetal and Neonatal Alloimmune Thrombocytopenia (FNAIT)Thrombocytopenia, Neonatal Alloimmune
RECRUITING50 Analytics
NCT06741969Nipocalimab in Moderate to Severe Sjogren's DiseaseSjogrens Syndrome
ACTIVE NOT_RECRUITING655 Analytics
NCT06449651A Study of Nipocalimab in Reducing the Risk of Fetal and Neonatal Alloimmune Thrombocytopenia (FNAIT)Thrombocytopenia, Neonatal Alloimmune
RECRUITING39 Analytics
NCT05912517A Study of Nipocalimab in Pregnancies at Risk for Severe Hemolytic Disease of the Fetus and Newborn (HDFN)Hemolytic Disease of the Fetus and Newborn
RECRUITING120 Analytics
NCT04951622A Study of Nipocalimab Administered to Adults With Generalized Myasthenia GravisMyasthenia Gravis
RECRUITING199 Analytics
PHASE3RECRUITING
A Study of Nipocalimab in Adults With Moderate to Severe Systemic Lupus Erythematosus
Lupus Erythematosus, SystemicUnlock trial analytics
PHASE3RECRUITING
Comparative Efficacy of Nipocalimab and Efgartigimod in Participants With Generalized Myasthenia Gravis
Myasthenia GravisUnlock trial analytics
PHASE3RECRUITING
A Study of Nipocalimab or Intravenous Immunoglobulin (IVIG) in Pregnancies At Risk of Fetal and Neonatal Alloimmune Thrombocytopenia (FNAIT)
Thrombocytopenia, Neonatal AlloimmuneUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Nipocalimab in Moderate to Severe Sjogren's Disease
Sjogrens SyndromeUnlock trial analytics
PHASE3RECRUITING
A Study of Nipocalimab in Reducing the Risk of Fetal and Neonatal Alloimmune Thrombocytopenia (FNAIT)
Thrombocytopenia, Neonatal AlloimmuneUnlock trial analytics
PHASE3RECRUITING
A Study of Nipocalimab in Pregnancies at Risk for Severe Hemolytic Disease of the Fetus and Newborn (HDFN)
Hemolytic Disease of the Fetus and NewbornUnlock trial analytics
PHASE3RECRUITING
A Study of Nipocalimab Administered to Adults With Generalized Myasthenia Gravis
Myasthenia GravisUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of Participants Achieving Systemic Lupus Erythematosus (SLE) Responder Index (SRI)-4 Composite Response at Week 52
Week 52

SLE SRI-4 composite response is a composite response of at least a 4 point reduction in SLE Disease Activity Index 2000 (SLEDAI-2K), no British Isles Lupus Assessment Group-2004 (BILAG-2004) worsening, defined as no new A or less than or equal to \<= 1 new B items compared to baseline, no worsening in Physician's Global Assessment (PGA \[greater than {\>} 10 percent {%} increase from baseline\]).

Arms 1 and 2: Averaged Mean Percent Change from Baseline in Total Immunoglobulin G (IgG) Levels Over Weeks 8, 10 and 12
Baseline, Weeks 8, 10 and 12

Average mean percent change from baseline in total IgG levels over Weeks 8 , 10 and 12 will be reported.

Fetus/Neonate with Outcome of Death or Adjudicated Severe Bleeding or Platelet Count Less Than (<) 30*10^9/L
Up to 1 Week post birth

Outcome of fetus/neonate death or adjudicated severe bleeding up to the first week post birth or platelet count \<30\*10\^9/L will be reported.

Change from Baseline in Clinical European League Against Rheumatism Sjogren's Syndrome Disease Activity Index (ClinESSDAI) Score at Week 48
Baseline to Week 48

ClinESSDAI is a validated tool used in clinical studies to measure the systemic disease activity in participants with SjD. The ClinESSDAI includes 11 domains divided into 3-4 activity levels, where zero represents no activity and low, medium, and high scores can vary in numerical value depending on the domain being measured. A higher score represents worse disease symptoms.

Percentage of Pregnancies That did not Result in Fetal Loss, Intrauterine Transfusion (IUT), Hydrops Fetalis, or Neonatal Death
From randomization in the study through 4 weeks of age or 41 weeks Postmenstrual Age (PMA) during neonatal period, whichever is later

Percentage of pregnancies that did not result in fetal loss, IUT, hydrops fetalis, or neonatal death (during the neonatal period) will be reported. Hydrops fetalis is defined as the presence of greater than or equal to(\>=)2 abnormal fluid collections in the fetus or neonate, such as ascites, pleural effusions, pericardial effusion, and generalized skin edema (skin thickness greater (\>)5 millimeter \[mm\]). PMA is the time elapsed between the first day of the last menstrual period and birth (gestational age) plus the time elapsed after birth (chronological age).

Double-blind (DB) Phase: Average Change From Baseline in Myasthenia Gravis - Activities of Daily Living (MG-ADL) Total Score Over Weeks 22, 23, and 24
Baseline, Weeks 22, 23, and 24

Average change from baseline over multiple timepoints (Weeks 22, 23, and 24) was reported in this outcome measure. The MG-ADL provided a rapid assessment of the participant's MG symptom severity of eight functions (talking, chewing, swallowing, breathing, impairment of ability to brush teeth or comb hair, impairment of ability to arise from a chair, double vision, eyelid droop) rated on a 4-point scale ranging from 0 (normal) to 3 (severe). MG-ADL total score was sum of 8 individual items, which ranging from 0 to 24. A higher score indicated greater symptom severity. Baseline was defined as the average of the screening and Day 1 total scores.

Sub Study: Percent Change in Anti-AChR Autoantibody Titer From Pre-first Nipocalimab Dose on Day 1 up to Week 8 (Day 57)
From pre-first nipocalimab dose on Day 1 up to Week 8 (Day 57)
Sub Study: Percent Change in Total IgG Levels From Pre-first Nipocalimab Dose on Day 1 up to Week 8 (Day 57)
From pre-first nipocalimab dose on Day 1 up to Week 8 (Day 57)
Change From Baseline in Disease Activity Index Score 28 Using C-reactive Protein (DAS28-CRP) at Week 12
Baseline (Week 0), Week 12

Change from baseline in DAS28-CRP at Week 12 were reported. The DAS28 is a composite index used to assess rheumatoid arthritis disease activity, calculated based on the tender joint count (out of 28 evaluated joints), swollen joint count (out of 28 evaluated joints), Patient's Global Assessment of Disease Activity, and C-reactive protein (CRP; in milligrams per liter \[mg/L\]). The set of 28 joint count was based on evaluation of the shoulder, elbow, wrist, metacarpophalangeal (MCP) MCP1 to MCP5, proximal interphalangeal (PIP) PIP1 to PIP5 joints of both the upper right extremity and the upper left extremity as well as the knee joints of lower right and lower left extremities. Score on the DAS28 ranged from 0 to 10, where higher scores indicated more disease activity. Negative changes from baseline indicated improvement of arthritis.

Stage B: Time to First Occurrence of a Relapse Event
Up to 52 weeks

Stage B time to first occurrence of a relapse event will be reported.

Change from Baseline in Total Serum Immunoglobulin-G (IgG) Levels
Up to 3 years

Change from baseline in total serum IgG levels were reported.

Number of Participants with Infectious Adverse Events (AEs)
Up to 3 years

Number of participants with infectious AEs will be reported. An AE is any untoward medical occurrence in a participant participating in a clinical study that does not necessarily have a causal relationship with the pharmaceutical/biological agent under study.

Number of Participants with Serious AEs (SAEs)
Up to 3 years

Number of participants with SAEs will be reported. A SAE is any AE that results in: death, persistent or significant disability/incapacity, requires inpatient hospitalization or prolongation of existing hospitalization, is life-threatening experience, is a congenital anomaly/birth defect, is suspected transmission of any infectious agent via a medicinal product, is medically important to prevent one of the outcomes listed above.

Number of Participants with Adverse Events of Special Interests (AESIs)
Up to 3 years

Number of participants with AESIs will be reported. Treatment-emergent AEs associated with the following situations are considered an AESI: a) infections that are severe or require intravenous (IV) anti-infective or operative/invasive intervention; b) hypoalbuminemia with albumin less than (\<)20 grams per liter (g/L) \[\<\] 2.0 grams per deciliter \[g/dL\]) c) opportunistic infections and d) Serious and non-serious deep-vein thrombosis (DVT) and/or pulmonary embolism (PE). Any AE occurring at or after the initial administration of study intervention through end of study is treatment emergent.

Number of Participants with Abnormalities in Clinical Laboratory Tests
Up to 3 years

Number of participants with abnormalities in clinical laboratory tests (including chemistry, hematology, coagulation, and urinalysis) will be reported.

Number of Participants with Abnormalities in Vital Signs
Up to 3 years

Number of participants with abnormalities in vital signs including sitting pulse/heart rate, sitting systolic and diastolic blood pressure, and oral temperature (degrees Celsius) will be reported.

Number of Participants with Abnormalities in Physical Examination
Up to 3 years

Number of participants with abnormalities in physical examinations including height, weight, assessments of the skin, head, eyes, ears, nose, throat, neck, thyroid, lungs, heart, abdomen, lymph nodes and extremities will be reported.

Serum Concentration of Nipocalimab over Time
Up to 3 years

Serum samples will be analyzed to determine concentrations of nipocalimab using a validated, specific, and sensitive immunoassay method.

Clearance (CL) of Nipocalimab
Up to 3 years

CL is defined as the volume of serum from which nipocalimab is completely removed per unit time.

Volume of Distribution (V) of Nipocalimab
Up to 3 years

V is defined as the representation of nipocalimab's propensity to either remain in the serum or redistribute to other tissue compartments.

Half-life (t1/2) of Nipocalimab
Up to 3 years

t1/2 is defined as the time it takes for nipocalimab's active substance in the body to reduce by half.

Steady-state Peak Concentration (Cpeak,ss) of Nipocalimab
Up to 3 years

Cpeak,ss is defined as the peak serum concentration of nipocalimab at steady state.

Steady-state Trough concentration (Ctrough,ss) of Nipocalimab
Up to 3 years

Ctrough,ss will be reported. It is defined as the observed serum concentration of nipocalimab just prior to the beginning of a dosing interval at steady state.

Steady-state Area Under the Curve (AUCss) of Nipocalimab
Up to 3 years

AUCss is defined as the area under the curve for nipocalimab at steady state.

Percentage of Participants who Achieve at Least Minimal Improvement (Greater Than or Equal to [>=] 20) in IMACS TIS and on Less Than or Equal to (<=) 5 Milligrams per day (mg/day) of Oral Prednisone (or Equivalent) From Week 44 Through Week 52
At Week 52

Percentage of participants who achieve at least minimal improvement (\>=20) in IMACS TIS at Week 52 and on \<=5 mg/day of oral prednisone (or equivalent) from Week 44 through Week 52 will be reported. International Myositis Assessment and Clinical Studies Total Improvement Score (IMACS TIS) is a standardized clinical response criteria to assess minimal, moderate and major clinical improvement in adult participants with idiopathic inflammatory myopathies (IIM). Minimal improvement is defined as IMACS TIS greater than or equal to (\>=) 20 in participants with IIM. The criteria use the 6 IMACS core set measures: physicians' global activity, patient global activity (PtGA), manual muscle testing (MMT)-8, muscle enzymes, myositis disease activity assessment tool (MDAAT), and health assessment questionnaire-disability index (HAQ-DI). The absolute percentage change in each measure with varying weights is combined to obtain a TIS on a scale of 0 to 100. Higher score indicates greater improvement.

Change from Baseline in Clinical European League Against Rheumatism Sjogren's Syndrome Disease Activity Index (clinESSDAI) Score at Week 24
Baseline to Week 24

The clinESSDAI is a validated tool used in clinical studies to measure the systemic disease activity in participants with primary Sjogren's syndrome. The clinESSDAI includes 11 domains divided into 3-4 activity levels, where zero represents no activity and low, medium, and high scores can vary in numerical value depending on the domain.

Percentage of Participants Achieving an Systemic Lupus Erythematosus (SLE) Responder Index (SRI)-4 Composite Response at Week 24
Week 24

SLE SRI-4 composite response is a composite of at least 4-point improvement in SLE Disease Activity Index 2000(SLEDAI-2K), no worsening in British Isles Lupus Assessment Group (BILAG), no worsening in Physician's Global Assessment of Disease Activity score (PGA) and not meeting study treatment failure criteria.

Percentage of Participants Achieving Durable Response of Improvement in Hemoglobin (Hgb)
Up to Week 20 of the double-blind period
Number of Maternal Participants With Treatment-emergent Adverse Events (TEAEs)
From baseline (Gestational Age [GA] Week 14) up to Postpartum (PP) Week 24 (up to 50 weeks)

An AE was any unfavorable and unintended sign (example, an abnormal laboratory finding), symptom, or disease temporally associated with the use of a drug, without any judgment about causality. TEAE was defined as any event occurring after the initiation of the first infusion of nipocalimab.

Number of Neonates/Infants With Adverse Events (AEs)
From Birth (PP Day 0) up to PP Week 96

An AE was any unfavorable and unintended sign (example, an abnormal laboratory finding), symptom, or disease temporally associated with the use of a drug, without any judgment about causality.

Number of Maternal Participants With Treatment-emergent Serious Adverse Events (TESAEs)
From baseline (Gestational Age [GA] Week 14) up to PP Week 24 (up to 50 weeks)

SAE was defined as any untoward medical occurrence that resulted in death, a life-threatening AE, inpatient hospitalization or prolongation of existing hospitalization, a persistent or significant incapacity or substantial disruption of the ability to conduct normal life functions, or a congenital anomaly/birth defect. An AE was any unfavorable and unintended sign (example, an abnormal laboratory finding), symptom, or disease temporally associated with the use of a drug, without any judgment about causality. TESAEs were any SAEs occurring after the initiation of the first infusion of nipocalimab.

Number of Neonates/Infants With Serious Adverse Events (SAEs)
From Birth (PP Day 0) up to PP Week 96

SAE was defined as any untoward medical occurrence that resulted in death, a life-threatening AE, inpatient hospitalization or prolongation of existing hospitalization, a persistent or significant incapacity or substantial disruption of the ability to conduct normal life functions, or a congenital anomaly/birth defect. An AE was any unfavorable and unintended sign (example, an abnormal laboratory finding), symptom, or disease temporally associated with the use of a drug, without any judgment about causality.

Number of Maternal Participants With Treatment-emergent Adverse Events of Special Interest (TEAESIs)
From baseline (Gestational Age [GA] Week 14) up to PP Week 24 (up to 50 weeks)

Number of maternal participants with TEAESIs were reported. An AE was any unfavorable and unintended sign (example, an abnormal laboratory finding), symptom, or disease temporally associated with the use of a drug, without any judgment about causality. All infections requiring anti-infective (that is, oral or intravenous antibacterial, antiviral, or antifungal) treatment and with hypoalbuminemia greater than or equal to (\>=) Grade 3 (less than \[\<\]20 gram per liter \[g/L\] by National Cancer Institute of Common Terminology Criteria for Adverse Events (NCI CTCAE) Version 5.0 criteria were considered an AESI for maternal participants. TEAE was defined as any event occurring after the initiation of the first infusion of nipocalimab.

Number of Neonates/Infants With Adverse Events of Special Interest (AESIs)
From birth (PP Day 0) up to PP Week 96

Number of neonates/infants with TEAESIs were reported. An AE was any unfavorable and unintended sign (example, an abnormal laboratory finding), symptom, or disease temporally associated with the use of a drug, without any judgment about causality. All infections requiring anti-infective (that is, oral or intravenous antibacterial, antiviral, or antifungal) treatment, unexpected/unusual childhood illnesses and Immunoglobulin G (IgG) concentrations \<200 milligrams per deciliter (mg/dL) at Week 24 through Week 47 or \<300 mg/dL at Week 48 through Week 96 were considered an AESI for neonates and infants.

Maternal Participants: Absolute Value of Electrocardiogram (ECG) Parameter - Mean Ventricular Rate at Baseline
Baseline (GA Week 14)

Absolute value of ECG parameter - mean ventricular rate at baseline in maternal participants was reported. Electrocardiogram assessments included comments on whether the tracings were normal or abnormal, rhythm, presence of arrhythmia or conduction defects, morphology, any evidence of myocardial infarction, or ST segment, T Wave, and U Wave abnormalities.

Maternal Participants: Absolute Value of Electrocardiogram (ECG) Parameter - Mean Ventricular Rate at GA Week 36
GA Week 36

Absolute value of ECG parameter - mean ventricular rate at GA Week 36 in maternal participants was reported. Electrocardiogram assessments included comments on whether the tracings were normal or abnormal, rhythm, presence of arrhythmia or conduction defects, morphology, any evidence of myocardial infarction, or ST segment, T Wave, and U Wave abnormalities.

Maternal Participants: Change From Baseline in ECG Parameter- Mean Ventricular Rate
Baseline (GA Week 14) and GA Week 36

Change from baseline in ECG parameter- mean ventricular rate in maternal participants was reported. Electrocardiogram assessments included comments on whether the tracings were normal or abnormal, rhythm, presence of arrhythmia or conduction defects, morphology, any evidence of myocardial infarction, or ST segment, T Wave, and U Wave abnormalities.

Number of Maternal Participants With Treatment-emergent (TE) Clinically Important Laboratory and Biomarker Immunoglobulin G (IgG) Values Over Time
From baseline (Gestational Age [GA] Week 14) up to PP Week 24 (up to 50 weeks)

Laboratory parameters included hematology, chemistry, blood Lipids panel, and Immunoglobulin G (IgG) parameters. TEAE was defined as any event occurring after the initiation of the first infusion of nipocalimab. Here, HDL: high-density lipoprotein, LDL: low-density lipoprotein. The during-pregnancy value of albumin \<20 g/L was from a local laboratory and was \>=20 g/L when analyzed at the central laboratory for the same time point.

Number of Neonates or Infants With Clinically Important Laboratory and Biomarker Immunoglobulin G (IgG) Values Over Time
From Birth (PP Day 0) up to PP Week 96

Laboratory parameters included total bilirubin and biomarker included immunoglobulin G (IgG).

Maternal Participants: Absolute Value of Vital Signs - Body Temperature at Baseline
Baseline (GA Week 14)

Absolute value of vital signs - body temperature at baseline in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs - Body Temperature at GA Week 36
GA Week 36

Absolute value of vital signs - body temperature at GA Week 36 in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs - Body Temperature at PP Week 24
PP Week 24

Absolute value of vital signs - body temperature at PP Week 24 in maternal participants was reported.

Maternal Participants: Change From Baseline in Vital Sign - Body Temperature
Baseline (GA Week 14), GA Week 36, and PP Week 24

Change from baseline in vital signs- body temperature in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs - Respiratory Rate at Baseline
Baseline (GA Week 14)

Absolute value of vital signs -respiratory rate at baseline in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs - Respiratory Rate at GA Week 36
GA Week 36

Absolute value of vital signs -respiratory rate at GA Week 36 in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs - Respiratory Rate at PP Week 24
PP Week 24

Absolute value of vital signs - respiratory rate at PP Week 24 in maternal participants was reported.

Maternal Participants: Change From Baseline in Vital Sign - Respiratory Rate
Baseline (GA Week 14), GA Week 36, and PP Week 24

Change from baseline in vital signs- respiratory rate in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs - Pulse Rate at Baseline
Baseline (GA Week 14)

Absolute value of vital signs - pulse rate at baseline in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs - Pulse Rate at GA Week 36
GA Week 36

Absolute value of vital signs -pulse rate at GA Week 36 in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs -Pulse Rate at PP Week 24
PP Week 24

Absolute value of vital signs -pulse rate at PP Week 24 in maternal participants was reported.

Maternal Participants: Change From Baseline in Vital Sign - Pulse Rate
Baseline (GA Week 14), GA Week 36, and PP Week 24

Change from baseline in vital signs -pulse rate in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs - Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) at Baseline
Baseline (GA Week 14)

Absolute value of vital signs - SBP and DBP at baseline in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs - Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) at GA Week 36
GA Week 36

Absolute value of vital signs -SBP and DBP at GA Week 36 in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs - Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) at PP Week 24
PP Week 24

Absolute value of vital signs - SBP and DBP at PP Week 24 in maternal participants was reported.

Maternal Participants: Change From Baseline in Vital Sign - Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP)
Baseline (GA Week 14), GA Week 36, and PP Week 24

Change from baseline in vital signs -SBP and DBP in maternal participants were reported.

Maternal Participants: Absolute Value of Vital Signs - Body Weight at Baseline
Baseline (GA Week 14)

Absolute value of vital signs - body weight at baseline in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs - Body Weight at GA Week 36
GA Week 36

Absolute value of vital signs -body weight at GA Week 36 in maternal participants was reported.

Maternal Participants: Absolute Value of Vital Signs - Body Weight at PP Week 24
PP Week 24

Absolute value of vital signs included body weight at PP Week 24 in maternal participants was reported.

Maternal Participants: Change From Baseline in Vital Sign - Body Weight
Baseline (GA Week 14), GA Week 36, and PP Week 24

Change from baseline in vital signs- body weight in maternal participants was reported.

Neonates/Infants: Absolute Value in Vital Signs - Body Temperature at Baseline
Baseline (PP Day 0)

Absolute value in vital signs parameter -body temperature at baseline was reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Signs - Body Temperature at PP Week 1
PP Week 1

Absolute value of vital signs parameter -body temperature at PP Week 1 was reported for all neonates/infants.

Neonates/Infants: Absolute Value in Vital Signs - Body Temperature at PP Week 4
PP Week 4

Absolute value in vital signs parameter - body temperature at PP Week 4 was reported for all neonates/infants.

Neonates/Infants: Absolute Value in Vital Signs - Body Temperature at PP Week 24
PP Week 24

Absolute value in vital signs parameter -body temperature at PP Week 24 was reported for all neonates/infants.

Neonates/Infants: Change From Baseline in Vital Signs - Body Temperature
Baseline (PP Day 0), PP Weeks 1, 4, and 24

Change from baseline in vital signs- body temperature were reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Signs - Body Weight at Baseline
Baseline (PP Day 0)

Absolute value of vital signs parameter- body weight at baseline was reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Signs - Body Weight at PP Week 1
PP Week 1

Absolute value of vital signs parameter - body weight at PP Week 1 was reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Signs - Body Weight at PP Week 4
PP Week 4

Absolute value of vital signs parameter - body weight at PP Week 4 was reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Signs - Body Weight at PP Week 24
PP Week 24

Absolute value of vital signs parameter - body weight at PP Week 24 was reported for all neonates/infants.

Neonates/Infants: Change From Baseline in Vital Signs -Body Weight
Baseline (PP Day 0), PP Weeks 1, 4, and 24

Change from baseline in vital signs - body weight were reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Signs - Respiratory Rate at Baseline
Baseline (PP Day 0)

Absolute value of vital signs parameter -respiratory rate at baseline was reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Signs - Respiratory Rate at PP Week 1
PP Week 1

Absolute value of vital signs parameter - respiratory rate at PP Week 1 was reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Signs - Respiratory Rate at PP Week 4
PP Week 4

Absolute value of vital signs parameter - respiratory rate at PP Week 4 was reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Signs - Respiratory Rate at PP Week 24
PP Week 24

Absolute value of vital signs parameter- respiratory rate at PP Week 24 was reported for all neonates/infants.

Neonates/Infants: Change From Baseline in Vital Signs - Respiratory Rate
Baseline (PP Day 0), PP Weeks 1, 4, and 24

Change from baseline in vital signs -respiratory rate was reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Sign - Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) at Baseline
Baseline (PP Day 0)

Absolute value of vital signs parameter - SBP and DBP at baseline were reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Sign - Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) at PP Week 1
PP Week 1

Absolute value of vital signs parameter - SBP and DBP at PP Week 1 were reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Sign - Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) at PP Week 4
PP Week 4

Absolute value of vital signs parameter -SBP and DBP at PP Week 4 were reported for all neonates/infants.

Neonates/Infants: Absolute Value of Vital Sign - Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) at PP Week 24
PP Week 24

Absolute value of vital signs parameter -SBP and DBP at PP Week 24 were reported for all neonates/infants.

Neonates/Infants: Change From Baseline in Vital Signs - Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP)
Baseline (PP Day 0), PP Weeks 1, 4, and 24

Change from baseline in vital signs- SBP and DBP were reported for all neonates/infants.

Percentage of Maternal Participants With Intrauterine Growth Restriction (IUGR) Based on Ultrasound Assessments
Baseline (GA Week 14), GA Weeks 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, and 36

Percentage of maternal participants with intrauterine growth restriction (IUGR) based on ultrasound assessments and guidelines from American College of Obstetricians and Gynecologists, and Society for Maternal-Fetal Medicine was reported. This outcome measure provided the incidence of with IUGR at delivery. IUGR is defined as weight below the 10th percentile for gestational age based on the World Health Organization (WHO) fetal growth curve.

Percentage of Maternal Participants With Abnormal Amniotic Fluid Values: Amniotic Fluid Index (AFI) at Baseline
Baseline (GA Week 14)

Percentage of maternal participants with abnormal amniotic fluid values: amniotic fluid index (AFI) at baseline was reported. The amniotic fluid volume abnormality was categorized as an AFI \<5 centimeter (cm) or \>24 cm.

Percentage of Maternal Participants With Abnormal Amniotic Fluid Values: AFI at GA Week 26
GA Week 26

Percentage of maternal participants with abnormal amniotic fluid values: AFI at GA Week 26 was reported. The amniotic fluid volume abnormality was categorized as an AFI \<5 cm or \>24 cm.

Percentage of Maternal Participants With Abnormal Amniotic Fluid Values: AFI at GA Week 36
GA Week 36

Percentage of maternal participants with abnormal amniotic fluid values: AFI at GA Week 36 was reported. The amniotic fluid volume abnormality was categorized as an AFI \<5 cm or \>24 cm.

Percentage of Maternal Participants With Abnormal Amniotic Fluid Values: Maximum Vertical Pocket (MVP) at Baseline
From Baseline (GA Week 14)

Percentage of maternal participants with abnormal amniotic fluid values: maximum vertical pocket (MVP) at baseline was reported. The amniotic fluid volume abnormality was categorized as MVP \<2 cm or \>8 cm.

Percentage of Maternal Participants With Abnormal Amniotic Fluid Values: MVP at GA Week 18
GA Week 18

Percentage of maternal participants with abnormal amniotic fluid values: MVP at GA Week 18 was reported. The amniotic fluid volume abnormality was categorized as MVP \<2 cm or \>8 cm.

Percentage of Maternal Participants With Abnormal Amniotic Fluid Values: MVP at GA Week 22
GA Week 22

Percentage of maternal participants with abnormal amniotic fluid values: MVP at GA Week 22 was reported. The amniotic fluid volume abnormality was categorized as MVP \<2 cm or \>8 cm.

Number of Neonates/Infants With Appearance, Pulse, Grimace Response, Activity, Respiration (Apgar) Score
1, 5, and 10 minutes after birth at PP Day 0

Number of neonates/infants with Apgar score from 1 to 10 minutes of life were reported. The system provided a standardized assessment for infants after delivery. The Apgar score comprises five components: 1) color, 2) heart rate, 3) reflexes, 4) muscle tone, and 5) respiration, each of which is given a score of 0, 1, or 2. The score is reported at 1 minute and 5 minutes after birth for all infants, and at 5-minute intervals thereafter until 20 minutes for infants with a score less than 7. This is using an Apgar scale which ranges from minimum total score of 0 and maximum total score of 10, with higher score representing a better outcome.

Number of Maternal Participants With Concomitant Medications and Therapies
From baseline (Gestational Age [GA] Week 14) up to PP Week 24 (up to 50 weeks)

Number of maternal participants with concomitant medications and therapies were reported.

Number of Neonates/Infants With Concomitant Medications and Therapies
From birth (PP Day 0) up to PP Week 96

Number of neonates/infants with concomitant medications and therapies were reported.

Percentage of Maternal Participants With Live Birth at or After Gestational Age (GA) Week 32 and Without an Intrauterine Transfusion (IUT) Throughout Their Entire Pregnancies
From baseline (GA Week 14) up to GA Week 37

Percentage of maternal participants with live birth at or after GA Week 32 and without an IUT throughout their entire pregnancies were reported.

Secondary Endpoints

Percentage of Participants Achieving SRI-4 Composite Response at Week 52 with High Baseline IFN Gene Signature (Interferon [IFN] high)
Week 52
Percentage of Participants Achieving SRI-4 Composite Response at Week 52 with Sustained Reduction in Oral Glucocorticoid (GC) Dose
Week 52
Percentage of Participants Who Achieve Lupus Low Disease Activity State (LLDAS) At Week 52
Week 52
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
NipocalimabEXPERIMENTALParticipants will receive nipocalimab up to Week 52 in the double blind treatment period along with standard of care treatments. At Week 52, eligible participants from both studies will have the option to enter an open-label long-term extension (OLE) period, where they will continue to receive nipocalimab until Week 156 or until the study intervention is discontinued.
PlaceboPLACEBO_COMPARATORParticipants will receive placebo up to Week 52 in the double blind treatment period along with standard of care treatment. At Week 52, eligible participants from both studies will have the option to enter an OLE period, where they will continue to receive nipocalimab until Week 156 or until the study intervention is discontinued.
Arm 1: NipocalimabEXPERIMENTALParticipants will receive nipocalimab intravenously (IV), at a loading dose on Day 1 followed by maintenance dosing once every 2 weeks (q2w) until Week 12.
Arm 2: EfgartigimodACTIVE_COMPARATORParticipants will receive efgartigimod IV, once a week for 4 weeks starting from Day 1. Eligible participants will be given the option to switch to Arm 3 between Week 4 and Week 12.
Arm 3: Treatment Switch (Nipocalimab)EXPERIMENTALParticipants previously treated with efgartigimod, who are directly enrolled in this arm, and eligible participants switching from Arm 2 will receive nipocalimab IV at a loading dose on Switch Day 1 followed by maintenance dosing q2w until Switch Week 12.
Arm 2: Intravenous Immunoglobins (IVIG)EXPERIMENTALMaternal participants with alloantibodies against HPA-1a and/or HPA-5b will be randomized to receive IVIG from GA week 12 for high-risk pregnancies or GA week 20 for standard-risk pregnancies. Additionally, prednisone will be added per study protocol. Participants will be gradually tapered off prednisone after delivery as per investigator judgement or maternal participant tolerance.
Nipocalimab Subcutaneous (SC)EXPERIMENTALOLE Phase: Participants from Cohort 1 will receive nipocalimab subcutaneous liquid in vial (SC-LIV) qw until Week 8. Participants with gMG from Cohort 2 who have not received nipocalimab previously, will receive nipocalimab SC-LIV until Week 8. Participants who complete the 8-week treatment period will have the opportunity to continue receiving nipocalimab SC-LIV qw in the Long term extension (LTE) period.
Certolizumab + PlaceboACTIVE_COMPARATORParticipants will receive placebo intravenously (IV) and certolizumab dose 1 subcutaneously at Week 0, 2, and 4 followed by placebo IV and certolizumab dose 2 subcutaneously at Weeks 6 to 22.
Certolizumab + NipocalimabEXPERIMENTALParticipants will receive nipocalimab IV and certolizumab dose 1 subcutaneously at Week 0, 2, and 4 followed by nipocalimab IV and certolizumab dose 2 subcutaneously at Weeks 6 to 22.
Group 1: PlaceboPLACEBO_COMPARATORParticipants will receive placebo intravenously (IV) every 2 weeks (q2w) through Week 10 along with standard-of-care background therapy.
Group 2: NipocalimabEXPERIMENTALParticipants will receive nipocalimab IV q2w through Week 10 along with standard-of-care background therapy.
Group 2: Nipocalimab Dose 1EXPERIMENTALParticipants will receive nipocalimab dose 1 IV q2w through Week 22 along with standard of care treatments (\[including ophthalmic drops, artificial tears and saliva, punctum plugs, and secretagogues\], and/or one immunomodulator with or without low-dose glucocorticosteroids).
Group 3: Nipocalimab Dose 2EXPERIMENTALParticipants will receive nipocalimab dose 2 IV q2w through Week 22 along with standard of care treatments (\[including ophthalmic drops, artificial tears and saliva, punctum plugs, and secretagogues\], and/or one immunomodulator with or without low-dose glucocorticosteroids).
M281 administered every 4 weeks (double-blind period)EXPERIMENTALParticipants will receive M281 administered every 4 weeks alternating with placebo every 4 weeks during the 24 weeks double-blind period.
M281 administered every 2 weeks (double-blind period)EXPERIMENTALParticipants will receive M281 administered every 2 weeks during the 24 weeks double-blind period.
Placebo administered every 2 weeks (double-blind period)EXPERIMENTALParticipants will receive M281 matching placebo administered every 2 weeks during the 24 weeks double-blind period.
M281 administered every 4 weeks (open-label extension period)EXPERIMENTALParticipants will receive M281 administered every 4 weeks during the 144 weeks open-label extension period.
M281 administered every 2 weeks (open-label extension period)EXPERIMENTALParticipants will receive M281 administered every 2 weeks during the 144 weeks open-label extension period.
M281EXPERIMENTAL -

Interventions

NameTypeDescription
NipocalimabDRUGNipocalimab will be administered.
PlaceboDRUGPlacebo will be administered.
Standard of care treatmentDRUGProtocol-defined topical and systemic standard of care background treatments.
EfgartigimodDRUGEfgartigimod will be administered intravenously.
Intravenous immunoglobulins (IVIG)DRUGIVIG will be administered intravenously.
PrednisoneDRUGPrednisone will be administered orally.
Nipocalimab SC-LIVDRUGNipocalimab will be administered subcutaneously.
M281DRUGM281 administered as IV infusion
CertolizumabDRUGCertolizumab will be administered subcutaneously.
GlucocorticoidsDRUGPrednisone or equivalent will be administered orally as Glucocorticoid.
Standard-of-care treatmentDRUGStandard-of-care treatment including immunomodulators, antimalarial drugs and GCs will be administered orally.
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites260

Inclusion Criteria:- * Medically stable on the basis of physical examination, medical history, vital signs and 12-lead electrocardiogram (ECG) performed at screening * Clinical diagnosis of systemic lupus erythematosus (SLE) for more than or equal to (\>=) 24 weeks prior to screening and meeting eu...

Countries:United StatesArgentinaAustraliaBrazilBulgariaChinaCzechiaDenmarkFinlandFranceGeorgiaGermanyGreeceHungaryIsraelItalyJapanMalaysiaNorwayPolandPortugalRomaniaSerbiaSlovakiaSouth AfricaSouth KoreaSpainSwitzerlandTaiwanThailandTurkey (Türkiye)United KingdomAustriaNetherlandsCanadaHong KongMexicoBelgiumSloveniaSwedenIrelandColombiaUkraineEgypt
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Recent Changes (Last 90 Days)

MEDIUMSep 25, 2026NCT05327114Completion: 2028-07-11 → 2028-11-27
LOWSep 25, 2026NCT05912517lastUpdatePostDate: changed
LOWSep 25, 2026NCT06449651lastUpdatePostDate: changed
LOWSep 25, 2026NCT07438496lastUpdatePostDate: changed
LOWSep 25, 2026NCT06533098lastUpdatePostDate: changed
LOWSep 25, 2026NCT07217587lastUpdatePostDate: changed
LOWSep 25, 2026NCT06741969lastUpdatePostDate: changed
MEDIUMSep 25, 2026NCT05327114Completion: 2028-07-11 → 2028-11-27
LOWSep 25, 2026NCT05912517lastUpdatePostDate: changed
LOWSep 25, 2026NCT07217587lastUpdatePostDate: changed
LOWSep 25, 2026NCT06449651lastUpdatePostDate: changed
LOWSep 25, 2026NCT06533098lastUpdatePostDate: changed
LOWSep 25, 2026NCT07438496lastUpdatePostDate: changed
LOWSep 25, 2026NCT06741969lastUpdatePostDate: changed
LOWSep 21, 2026NCT05379634lastUpdatePostDate: changed
LOWSep 21, 2026NCT05379634lastUpdatePostDate: changed
LOWAug 31, 2026NCT04119050lastUpdatePostDate: changed
LOWAug 31, 2026NCT04119050lastUpdatePostDate: changed
LOWAug 28, 2026NCT06533098lastUpdatePostDate: changed
LOWAug 28, 2026NCT07438496lastUpdatePostDate: changed

Frequently asked questions about M281

What is M281 used for?

M281 is an investigational drug being studied for generalized myasthenia gravis, hemolytic disease of the fetus and newborn, and warm autoimmune hemolytic anemia. It is in Phase 2 clinical development and has not been approved for any indication. Johnson & Johnson is the developer.

What does M281 target?

M281 targets the neonatal Fc receptor, also known as FcRn, a protein involved in recycling immunoglobulin G antibodies. By binding to FcRn, M281 is designed to reduce levels of pathogenic IgG antibodies, which are implicated in autoimmune conditions such as generalized myasthenia gravis and warm autoimmune hemolytic anemia.

Who is developing M281?

M281 is being developed by Johnson & Johnson, which trades on the New York Stock Exchange under the ticker symbol JNJ. The company is responsible for the clinical development program across the studied indications.

What phase is M281 in?

M281 is in Phase 2 clinical development. It is an investigational therapy and has not received FDA approval. The Phase 2 program includes studies in generalized myasthenia gravis, hemolytic disease of the fetus and newborn, and warm autoimmune hemolytic anemia.

What clinical trials is M281 in?

M281 has been studied in three Phase 2 trials: NCT04119050 in warm autoimmune hemolytic anemia, NCT03842189 in hemolytic disease of the fetus and newborn, and NCT03772587 in generalized myasthenia gravis. The warm autoimmune hemolytic anemia trial is active but not recruiting, while the other two are completed.

Is M281 the same as nipocalimab?

Yes, M281 is also known as nipocalimab. Both names refer to the same investigational FcRn-targeting therapy developed by Johnson & Johnson for autoimmune and alloimmune conditions.