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A Study to Learn About the Study Medicine Etrasimod in Adults With Moderate to Severe Atopic Dermatitis (AD) Who Have Already Tried Treatments Taken by Mouth or by Injection

A PHASE 2/3, TWO-PART STUDY TO EVALUATE THE EFFICACY AND LONG-TERM SAFETY WITH ORAL ETRASIMOD, 2 MG, ONCE DAILY IN ADULT PARTICIPANTS WITH MODERATE-TO-SEVERE ATOPIC DERMATITIS WITH A HISTORY OF PRIOR SYSTEMIC TREATMENT FAILURE

Status
Terminated
Phases
Phase 2Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT05732454
Enrollment
58
Registered
2023-02-17
Start date
2023-01-18
Completion date
2024-04-29
Last updated
2025-05-08

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Atopic Dermatitis, Atopic Dermatitis, Unspecified, Eczema, Eczema, Atopic

Keywords

Systemic Failure, Oral

Brief summary

The purpose of this study is to learn about the safety and effects of the study medicine called etrasimod for the possible treatment of atopic dermatitis (AD), also called eczema, in adults who have already tried AD treatments taken by mouth or by injection that work all over the body. These adults can have moderate to severe AD. This study is seeking participants who: * have AD for at least 1 year * have moderate-to-severe AD * have tried treatments that work all over the body and saw no effects * are willing to apply a moisturizer at least once daily during the study This is a 2-part study that is only selecting about 60 participants for Part 1 as of now. In Part 1, half of the participants will receive etrasimod, a pill to be taken by mouth once daily. The other half will receive a placebo, a pill that looks like etrasimod but has no medicine also taken by mouth once daily. No one will know what treatment the participant is taking. The Sponsor will compare participant experiences of those taking etrasimod to those taking placebo for 16 weeks. This will help determine if the study medicine is safe and effective. After the first 16 weeks, some participants may continue the study knowing they are taking etrasimod for an additional 52 weeks. Those participating for just the first 16-weeks, will need to visit the study clinic at least 6 times during the study (about every 4 weeks), and will have to come for 2 safety follow up visits at 2nd and 4th week after the last dose of study medicine. People who want to and can continue for an additional 52 weeks will need to visit the study clinic for at least 6 more visits making 12 total visits over 68 weeks followed by 2 safety follow up visits at the 2nd and 4th week after the last dose of study medicine. In Part 2 of the study, around 340 more participants will be participating. Everyone will receive etrasimod pills once daily for 52 weeks. Participants will need to go to the study clinic at least 9 times after which they will have to go for 2 more safety follow up visits at the 2nd and 4th weeks after the last dose of study medicine. At every study visit in Part 1 and Part 2, the focus will be on signs and symptoms of AD (like lesions, itch, and pain) as well as general health and overall side effects. Blood samples and vital signs will be taken at every visit. Due to the way the study medicine works, the in-study clinic visit will last at least 4 hours on Day 1 (Part 1 and Part 2) and Week 16 (Part 1).

Interventions

DRUGetrasimod

PART 1 Double Blind one 2 mg tablet once daily for up to 16 weeks PART 1 Open Label Extension one 2 mg tablet once daily for an additional 52 weeks PART 2 Open Label one 2 mg tablet once daily for up 52 weeks

DRUGPlacebo

PART 1 DOUBLE BLIND Placebo - one table daily for up to 16 weeks

Sponsors

Pfizer
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)

Masking description

PART 1 Double Blind portion (Day 1 through Week 16): all parties are blinded to treatment. PART 1 Open Label Extension portion: All parties will be aware participant is taking etrasimod for up to an additional 52 weeks. PART 2 Open Label All parties will be aware participant is taking etrasimod for 52 weeks.

Intervention model description

Part 1: Approximately 60 participants with moderate-to-severe AD with a history of prior systemic treatment failure will be randomized (1:1 ratio) in a double blind (DB) manner to receive etrasimod 2 mg or placebo orally, once daily, for 16 weeks. Randomization will be stratified by disease severity as measured by IGA score (3 \[moderate AD\], 4 \[severe AD\]) at baseline. After DB period, participants may be given the option to continue in an open label extension (OLE) phase whereby they will receive etrasimod 2 mg (tablet) for up to an additional 52 weeks. Part 2: Approximately 340 additional participants will be enrolled to receive etrasimod 2 mg orally, once daily, for 52 weeks in an open-label manner.

Eligibility

Sex/Gender
ALL
Age
18 Years to 80 Years
Healthy volunteers
No

Inclusion criteria

Participants must meet the following key inclusion criteria to be eligible for enrollment into the study: 1\. Age 18-80 at screening (or minimum age of consent according to local regulations). 2 Chronic AD (also known as atopic eczema) that was diagnosed at least 1 year prior to Screening and meets Hanifin and Rajka criteria at screening).1 3. Moderate to severe AD: 1. IGA score ≥3 (on the 0 to 4 IGA scale, in which 3 = moderate and 4 = severe) at screening and baseline (Day 1) 2. BSA ≥10% of AD involvement at screening and baseline (Day 1) 3. Eczema Area and Severity Index (EASI) ≥16 at screening and baseline (Day 1) 4. A participant who has failed a prior systemic therapy for AD, ie, refractory, moderate-to-severe AD that is not adequately controlled with other systemic drug products, including biologics, or when use of those therapies is inadvisable. 5\. Willing to apply a topical emollient/moisturizer at least once daily for ≥1 week prior to baseline (Day 1) and willing to maintain consistent (ie, no change in type, frequency, or application) daily application over the course of the study.

Exclusion criteria

Participants are excluded from the study if any of the following criteria apply: Medical Conditions: 1. Presence of confounding factors: * Skin conditions (eg, psoriasis, seborrheic dermatitis) that may interfere with evaluation of AD or assessment of treatment response as deemed by the investigator. * Current significant active infection or requiring a treatment for infection that may interfere with the assessment of AD. 2. Hypersensitivity to etrasimod or any of the excipients. 3. Other medical or psychiatric condition including recent (within the past year) or active suicidal ideation/behavior or laboratory abnormality that may increase the risk of study participation or, in the investigator's judgment, make the participant inappropriate for the study.

Design outcomes

Primary

MeasureTime frameDescription
Part 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignOLE Period: Day 141/Week 20; Day 169/Week 24; Day 281/Week 40; Follow Up 1; Follow Up 2Vital signs evaluation included SBP, DBP, pulse rate. Number of participants with non-zero vital signs abnormalities are reported in this outcome measure.
Part 1, OLE Period: Number of Participants With Laboratory Test AbnormalitiesOLE Period: First dose of study drug in OLE period up to 4 weeks after last dose in OLE period (up to maximum of 56 Weeks)Laboratory assessments included hematology, clinical chemistry, urinalysis, other parameters and reflex tests. Number of participants with abnormalities in any of laboratory parameters is reported.
Part 1, OLE Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksOLE Period: Day 169/Week 24Standard 12-lead ECGs utilizing limb leads were used to measure PR interval, QT interval, QTcF, and QRS complex. Number of participants with non-zero ECG abnormalities and AV blocks are reported in this outcome measure.
Part 1, DB Period: Percentage of Participants Achieving Investigator's Global Assessment (IGA) Response at Week 16DB Period: Week 16IGA measured AD severity, based on a 5-point scale (0-4); 0= AD is clear, 1= AD is almost clear, 2= mild AD, 3= moderate AD and 4= severe AD. IGA response was defined as participants achieving IGA 0 (clear) or 1 (almost clear) and a reduction of \>=2 points from baseline.
Part 1, DB Period: Number of Participants With Treatment Emergent Adverse Events (TEAEs) (All Causality)DB Period: From first dose of study drug up to 16 Weeks of treatmentAn 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state.
Part 1, DB Period: Number of Participants With TEAEs (All Causality) Leading to Study Treatment DiscontinuationDB Period: From first dose of study drug up to 16 Weeks of treatmentAn 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state.
Part 1, DB Period: Number of Participants With Treatment Emergent Serious Adverse Events (SAEs) (All Causality)DB Period: From first dose of study drug up to 16 Weeks of treatmentAn 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state. SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; life-threatening experience (immediate risk of death); new or prolonged inpatient hospitalization; persistent or significant disability/incapacity; congenital anomaly/birth defect; suspected transmission via a Pfizer product of an infectious agent, pathogenic or non-pathogenic or other medical events judged by investigator.
Part 1, DB Period: Number of Participants With Treatment Emergent AEs of Special Interest (AESIs) (All Causality)DB Period: From first dose of study drug up to 16 Weeks of treatmentAn 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state. AESIs included here were cardiovascular events (i.e., bradycardia, Atrioventricular (AV) conduction delay, and hypertension); macular edema, pulmonary events (airflow obstruction or decreased gas exchange); infections (severe infections, opportunistic infections \[including progressive multifocal leukoencephalopathy (PML)\], Herpes simplex and Herpes zoster); liver injury (liver transaminase elevation and bilirubin elevation); posterior reversible encephalopathy syndrome (PRES) and malignancies.
Part 1, DB Period: Number of Participants With Laboratory Test AbnormalitiesDB Period: From first dose of study drug up to 16 Weeks of treatmentLaboratory assessments included hematology, clinical chemistry, urinalysis, other parameters and reflex tests. Number of participants with abnormalities in any of laboratory parameters is reported.
Part 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksDB Period: Pre-dose and 4 hours (hrs) post-dose on Day 1/Week 0; Pre-dose and 4 hrs post-dose on Day 113/Week 16Standard 12-lead ECGs utilizing limb leads were used to measure PR interval, QT interval, QTc corrected using Fridericia's formula (QTcF), and QRS complex. Number of participants with non-zero ECG abnormalities and AV blocks are reported in this outcome measure.
Part 1, DB Period: Number of Participants With Markedly Abnormal Vital SignDB Period: Pre-dose and 1, 2, 3, 4 hours (hrs) post-dose on Day 1/Week 0; Day 29/Week 4; Day 57/Week 8; Day 85/Week 12; Pre-dose and 1, 2, 3, 4, 5 and 6 hrs post-dose on Day 113/Week 16Vital signs evaluation included systolic blood pressure (SBP), diastolic blood pressure (DBP), pulse rate. Number of participants with non-zero vital signs abnormalities are reported in this outcome measure.
Part 1, OLE Period: Number of Participants With TEAEs (All Causality)OLE Period: First dose of study drug in OLE period up to 4 weeks after last dose in OLE period (up to maximum of 56 Weeks)An 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state.
Part 1, OLE Period: Number of Participants With Treatment Emergent AEs (All Causality) Leading to Study Treatment DiscontinuationOLE Period: First dose of study drug in OLE period up to 4 weeks after last dose in OLE period (up to maximum of 56 Weeks)An 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state.
Part 1, OLE Period: Number of Participants With Treatment Emergent SAEs (All Causality)OLE Period: First dose of study drug in OLE period up to 4 weeks after last dose in OLE period (up to maximum of 56 Weeks)An 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state. SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; life-threatening experience (immediate risk of death); new or prolonged inpatient hospitalization; persistent or significant disability/incapacity; congenital anomaly/birth defect; suspected transmission via a Pfizer product of an infectious agent, pathogenic or non-pathogenic or other medical events judged by investigator.
Part 1, OLE Period: Number of Participants With Treatment Emergent AESIs (All Causality)OLE Period: First dose of study drug in OLE period up to 4 weeks after last dose in OLE period (up to maximum of 56 Weeks)An 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state. AESIs included here were cardiovascular events (i.e., bradycardia, AV conduction delay, and hypertension); macular edema, pulmonary events (airflow obstruction or decreased gas exchange); infections (severe infections, opportunistic infections \[including PML\], Herpes simplex and Herpes zoster); liver injury (liver transaminase elevation and/or bilirubin elevation); PRES and malignancies.

Secondary

MeasureTime frameDescription
Part 1, DB Period: Percent Change From Baseline in EASI Score at Week 16DB Period: Baseline, Week 16EASI quantified severity of AD based on severity of lesion clinical signs and percentage (%) of body surface area (BSA) affected. Severity of clinical signs of AD lesions (erythema \[E\], induration/papulation \[I\], excoriation \[Ex\] and lichenification \[L\]) were scored separately for each of 4 body regions (head and neck, upper limbs, trunk \[including axillae and groin)\] and lower limbs \[including buttocks\]) on a 4-point scale: 0= absent; 1= mild; 2= moderate; 3= severe. EASI area score was based on % BSA with AD in body region: 0 (0%), 1 (\>0 to \<10%), 2 (10 to \<30%), 3 (30 to \<50%), 4 (50 to \<70%), 5 (70 to \<90%) and 6 (90 to 100%). Total EASI score =0.1\*Ah\*(Eh+Ih+Exh+Lh) + 0.2\*Au\*(Eu+Iu+ExU+Lu) + 0.3\*At\*(Et+It+Ext+Lt) + 0.4\*Al\*(El+Il+Exl+Ll); A = EASI area score; h = head and neck; u = upper limbs; t = trunk; l = lower limbs.
Part 1, DB Period: Percentage of Participants Who Achieved >=75% Reduction From Baseline in Eczema Area and Severity Index (EASI) Score (EASI-75) at Week 16DB Period: Week 16EASI-75 response was defined as a 75% reduction or greater in EASI score from Baseline to Week 16. EASI quantified severity of AD based on severity of lesion clinical signs and percentage (%) of body surface area (BSA) affected. Severity of clinical signs of AD lesions (erythema \[E\], induration/papulation \[I\], excoriation \[Ex\] and lichenification \[L\]) were scored separately for each of 4 body regions (head and neck, upper limbs, trunk \[including axillae and groin)\] and lower limbs \[including buttocks\]) on a 4-point scale: 0= absent; 1= mild; 2= moderate; 3= severe. EASI area score was based on % BSA with AD in body region: 0 (0%), 1 (\>0 to \<10%), 2 (10 to \<30%), 3 (30 to \<50%), 4 (50 to \<70%), 5 (70 to \<90%) and 6 (90 to 100%). Total EASI score =0.1\*Ah\*(Eh+Ih+Exh+Lh) + 0.2\*Au\*(Eu+Iu+ExU+Lu) + 0.3\*At\*(Et+It+Ext+Lt) + 0.4\*Al\*(El+Il+Exl+Ll); A = EASI area score; h = head and neck; u = upper limbs; t = trunk; l = lower limbs.

Countries

Canada, Czechia, Poland, United States

Participant flow

Recruitment details

The study had 2 parts: Part 1 and Part 2. Part 2 was never initiated; hence no results are reported for it. All results are pertaining to Part 1 in the record. Part 1 of the study had 16-week double-blind (DB) treatment period and then 52-week part 1 open label extension (OLE) treatment period.

Pre-assignment details

A total of 58 participants with moderate-to-severe atopic dermatitis (AD) were enrolled in Part 1- DB period and out of them 51 continued into the Part 1- OLE period.

Participants by arm

ArmCount
DB Etrasimod 2 mg Then OLE Etrasimod 2 mg
Participants were randomized to receive etrasimod 2 milligram (mg) orally once daily for 16 weeks in DB period of Part 1. Eligible participants per investigator's judgement then continued to receive etrasimod 2 mg orally once daily for maximum of another 52 weeks in OLE period of Part 1.
30
DB Placebo Then OLE Etrasimod 2 mg
Participants were randomized to receive placebo matched to etrasimod 2 mg orally once daily for 16 weeks in DB period of Part 1. Eligible participants per investigator's judgement then received etrasimod 2 mg orally once daily for maximum of another 52 weeks in OLE period of Part 1.
28
Total58

Withdrawals & dropouts

PeriodReasonFG000FG001
Part 1: DB PeriodAdverse Event10
Part 1: DB PeriodLost to Follow-up10
Part 1: DB PeriodProtocol Violation01
Part 1: DB PeriodWithdrawal by Subject12
Part 1: OLE PeriodAdverse Event01
Part 1: OLE PeriodLack of Efficacy01
Part 1: OLE PeriodStudy Terminated by Sponsor2519
Part 1: OLE PeriodWithdrawal by Subject23

Baseline characteristics

CharacteristicDB Placebo Then OLE Etrasimod 2 mgTotalDB Etrasimod 2 mg Then OLE Etrasimod 2 mg
Age, Continuous43.4 Years
STANDARD_DEVIATION 18.18
41.6 Years
STANDARD_DEVIATION 16.45
40.0 Years
STANDARD_DEVIATION 14.78
Ethnicity (NIH/OMB)
Hispanic or Latino
5 Participants10 Participants5 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
23 Participants48 Participants25 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
0 Participants0 Participants0 Participants
Race (NIH/OMB)
American Indian or Alaska Native
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Asian
0 Participants3 Participants3 Participants
Race (NIH/OMB)
Black or African American
1 Participants4 Participants3 Participants
Race (NIH/OMB)
More than one race
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Unknown or Not Reported
0 Participants0 Participants0 Participants
Race (NIH/OMB)
White
27 Participants51 Participants24 Participants
Sex: Female, Male
Female
9 Participants30 Participants21 Participants
Sex: Female, Male
Male
19 Participants28 Participants9 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
EG002
affected / at risk
EG003
affected / at risk
EG004
affected / at risk
EG005
affected / at risk
deaths
Total, all-cause mortality
0 / 300 / 280 / 300 / 280 / 300 / 28
other
Total, other adverse events
6 / 304 / 284 / 301 / 289 / 305 / 28
serious
Total, serious adverse events
0 / 300 / 281 / 300 / 281 / 300 / 28

Outcome results

Primary

Part 1, DB Period: Number of Participants With Laboratory Test Abnormalities

Laboratory assessments included hematology, clinical chemistry, urinalysis, other parameters and reflex tests. Number of participants with abnormalities in any of laboratory parameters is reported.

Time frame: DB Period: From first dose of study drug up to 16 Weeks of treatment

Population: DB period: Safety analysis set included of all participants who were randomized and received at least 1 dose of study drug in DB period. Here, Overall Number of Participants Analyzed signifies number of participants evaluable for this outcome measure.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Laboratory Test Abnormalities22 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Laboratory Test Abnormalities13 Participants
Primary

Part 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks

Standard 12-lead ECGs utilizing limb leads were used to measure PR interval, QT interval, QTc corrected using Fridericia's formula (QTcF), and QRS complex. Number of participants with non-zero ECG abnormalities and AV blocks are reported in this outcome measure.

Time frame: DB Period: Pre-dose and 4 hours (hrs) post-dose on Day 1/Week 0; Pre-dose and 4 hrs post-dose on Day 113/Week 16

Population: DB period: Safety analysis set included of all participants who were randomized and received at least 1 dose of study drug in DB period. Here, Number Analyzed= number of participants evaluable for specified timepoints.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksPre-dose/Day 1: AV conduction: First-degree AV Block1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks4 hrs post-dose/Day 1: QTCF (msec), single beat:>= 450 (male) or >= 470 (female)1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks4 hrs post-dose/Day 1: Change From Baseline (CFB) in QT: >30 msec increase9 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks4 hrs post-dose/Day 1: AV conduction: First degree AV Block3 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksPre-dose/Week 16: CFB in QT: >30 msec increase1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksPre-dose/Week 16: CFB in QT: >60 msec increase1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksPre-dose/Week 16: CFB in QTcF: >30 msec increase2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks4 hrs post-dose/Week 16: CFB in QTcF: >30 msec increase2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks4 hrs post-dose/Week 16: CFB in QT: >30 msec increase2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks4 hrs post-dose/Week 16: AV conduction: First degree AV Block2 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks4 hrs post-dose/Week 16: CFB in QTcF: >30 msec increase0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksPre-dose/Day 1: AV conduction: First-degree AV Block0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksPre-dose/Week 16: CFB in QT: >60 msec increase0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks4 hrs post-dose/Day 1: QTCF (msec), single beat:>= 450 (male) or >= 470 (female)0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks4 hrs post-dose/Week 16: AV conduction: First degree AV Block0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks4 hrs post-dose/Day 1: Change From Baseline (CFB) in QT: >30 msec increase0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksPre-dose/Week 16: CFB in QTcF: >30 msec increase0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks4 hrs post-dose/Day 1: AV conduction: First degree AV Block0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks4 hrs post-dose/Week 16: CFB in QT: >30 msec increase0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksPre-dose/Week 16: CFB in QT: >30 msec increase0 Participants
Primary

Part 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign

Vital signs evaluation included systolic blood pressure (SBP), diastolic blood pressure (DBP), pulse rate. Number of participants with non-zero vital signs abnormalities are reported in this outcome measure.

Time frame: DB Period: Pre-dose and 1, 2, 3, 4 hours (hrs) post-dose on Day 1/Week 0; Day 29/Week 4; Day 57/Week 8; Day 85/Week 12; Pre-dose and 1, 2, 3, 4, 5 and 6 hrs post-dose on Day 113/Week 16

Population: DB period: Safety analysis set included of all participants who were randomized and received at least 1 dose of study drug in DB period. Here, Number Analyzed= number of participants evaluable for specified timepoints.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 12: Pulse rate: <60 bpm1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post-dose/Day 1: Pulse rate: <60 bpm11 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 12: Pulse rate: >100 bpm0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post-dose/Day 1: DBP >90 mmHg2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignPre-dose/Week 16: SBP: >150 mmHg0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post-dose/Day 1: DBP: >90 mmHg1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignPre-dose/Week 16: DBP: >90 mmHg2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post-dose/Day 1: DBP >90 mmHg0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignPre-dose/Week 16: Pulse rate: <60 bpm2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post-dose/Day 1: Pulse rate: <60 bpm10 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post dose/Week 16: SBP: >150 mmHg0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignPre-dose/Day 1: Pulse rate: <60 bpm1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post-dose/Week 16: SBP: Change >=30 mmHg decrease0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post-dose/Day 1: Pulse rate: >100 bpm1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post dose/Week 16: DBP: >90 mmHg2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post-dose/Day 1: Pulse rate: <60 bpm12 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post dose/Week 16: Pulse rate: <50 bpm1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 4: DBP:>90 mmHg2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post dose/Week 16: Pulse rate: <60 bpm3 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post-dose/Day 1: Pulse rate: <50 bpm1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post dose/Week 16: SBP: >150 mmHg0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 4: Pulse rate: <60 bpm2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post-dose/Week 16: SBP: Change >=30 mmHg decrease0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post-dose/Day 1:SBP >150 mmHg0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post dose/Week 16: DBP: >90 mmHg2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 4: Pulse rate: >100 bpm1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post dose/Week 16: Pulse rate: <50 bpm0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post-dose/Day 1: SBP: Change >=30 mmHg decrease0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post dose/Week 16: Pulse rate: <60 bpm3 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 8: SBP: >150 mmHg0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post dose/Week 16:DBP: >90 mmHg2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post-dose/Day 1: SBP: Change>=30 mmHg decrease1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post dose/Week 16: Pulse rate: <50 bpm0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 8: DBP:>90 mmHg3 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post dose/Week 16: Pulse rate: <60 bpm3 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post-dose/Day 1: Pulse rate: <60 bpm7 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post dose/Week 16: SBP: >150 mmHg0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 8: DBP: Change >=20 mmHg decrease0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post dose/Week 16: DBP:>90 mmHg2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post-dose/Day 1: DBP:>90 mmHg0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post-dose/Week 16: DBP: Change >=20 mmHg decrease0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 8: Pulse rate: <60 bpm3 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post dose/Week 16: Pulse rate: <50 bpm0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignPre-dose/Day 1: Pulse rate >100 bpm1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post dose/Week 16: Pulse rate:<60 bpm1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 12: SBP: >150 mmHg0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign5 hrs post dose/Week 16:Pulse rate:<50 bpm0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post-dose/Day 1: DBP: Change>=20 mmHg decrease2 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign5 hrs post dose/Week 16:Pulse rate:<60 bpm0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 12: DBP:>90 mmHg1 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign6 hrs post dose/Week 16:Pulse rate:<50 bpm0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post-dose/Day 1: SBP: >150 mmHg0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign6 hrs post dose/Week 16: Pulse rate:<60 bpm0 Participants
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignPre-dose/Day 1: DBP >90 mmHg0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign6 hrs post dose/Week 16: Pulse rate:<60 bpm1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignPre-dose/Day 1: DBP >90 mmHg1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignPre-dose/Day 1: Pulse rate: <60 bpm3 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignPre-dose/Day 1: Pulse rate >100 bpm0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post-dose/Day 1: SBP: Change >=30 mmHg decrease1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post-dose/Day 1: DBP >90 mmHg2 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post-dose/Day 1: Pulse rate: <50 bpm0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post-dose/Day 1: Pulse rate: <60 bpm3 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post-dose/Day 1: SBP: >150 mmHg2 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post-dose/Day 1: DBP >90 mmHg1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post-dose/Day 1: Pulse rate: <60 bpm5 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post-dose/Day 1:SBP >150 mmHg1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post-dose/Day 1: SBP: Change>=30 mmHg decrease0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post-dose/Day 1: DBP:>90 mmHg1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post-dose/Day 1: DBP: Change>=20 mmHg decrease0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post-dose/Day 1: Pulse rate: <60 bpm6 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post-dose/Day 1: DBP: >90 mmHg1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post-dose/Day 1: Pulse rate: <60 bpm5 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post-dose/Day 1: Pulse rate: >100 bpm0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 4: DBP:>90 mmHg3 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 4: Pulse rate: <60 bpm1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 4: Pulse rate: >100 bpm0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 8: SBP: >150 mmHg1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 8: DBP:>90 mmHg3 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 8: DBP: Change >=20 mmHg decrease1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 8: Pulse rate: <60 bpm1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 12: SBP: >150 mmHg1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 12: DBP:>90 mmHg3 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 12: Pulse rate: <60 bpm0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignWeek 12: Pulse rate: >100 bpm2 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignPre-dose/Week 16: SBP: >150 mmHg1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignPre-dose/Week 16: DBP: >90 mmHg0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital SignPre-dose/Week 16: Pulse rate: <60 bpm2 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post dose/Week 16: SBP: >150 mmHg1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post-dose/Week 16: SBP: Change >=30 mmHg decrease1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post dose/Week 16: DBP: >90 mmHg1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post dose/Week 16: Pulse rate: <50 bpm1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign1 hr post dose/Week 16: Pulse rate: <60 bpm4 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post dose/Week 16: SBP: >150 mmHg1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post-dose/Week 16: SBP: Change >=30 mmHg decrease2 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post dose/Week 16: DBP: >90 mmHg2 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post dose/Week 16: Pulse rate: <50 bpm1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign2 hrs post dose/Week 16: Pulse rate: <60 bpm10 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post dose/Week 16:DBP: >90 mmHg0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post dose/Week 16: Pulse rate: <50 bpm1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign3 hrs post dose/Week 16: Pulse rate: <60 bpm9 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post dose/Week 16: SBP: >150 mmHg1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post dose/Week 16: DBP:>90 mmHg0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post-dose/Week 16: DBP: Change >=20 mmHg decrease1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post dose/Week 16: Pulse rate: <50 bpm1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign4 hrs post dose/Week 16: Pulse rate:<60 bpm6 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign5 hrs post dose/Week 16:Pulse rate:<50 bpm1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign5 hrs post dose/Week 16:Pulse rate:<60 bpm1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Markedly Abnormal Vital Sign6 hrs post dose/Week 16:Pulse rate:<50 bpm1 Participants
Primary

Part 1, DB Period: Number of Participants With TEAEs (All Causality) Leading to Study Treatment Discontinuation

An 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state.

Time frame: DB Period: From first dose of study drug up to 16 Weeks of treatment

Population: DB period: Safety analysis set included of all participants who were randomized and received at least 1 dose of study drug in DB period.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With TEAEs (All Causality) Leading to Study Treatment Discontinuation1 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With TEAEs (All Causality) Leading to Study Treatment Discontinuation0 Participants
Primary

Part 1, DB Period: Number of Participants With Treatment Emergent Adverse Events (TEAEs) (All Causality)

An 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state.

Time frame: DB Period: From first dose of study drug up to 16 Weeks of treatment

Population: DB period: Safety analysis set included of all participants who were randomized and received at least 1 dose of study drug in DB period.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Treatment Emergent Adverse Events (TEAEs) (All Causality)16 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Treatment Emergent Adverse Events (TEAEs) (All Causality)8 Participants
Primary

Part 1, DB Period: Number of Participants With Treatment Emergent AEs of Special Interest (AESIs) (All Causality)

An 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state. AESIs included here were cardiovascular events (i.e., bradycardia, Atrioventricular (AV) conduction delay, and hypertension); macular edema, pulmonary events (airflow obstruction or decreased gas exchange); infections (severe infections, opportunistic infections \[including progressive multifocal leukoencephalopathy (PML)\], Herpes simplex and Herpes zoster); liver injury (liver transaminase elevation and bilirubin elevation); posterior reversible encephalopathy syndrome (PRES) and malignancies.

Time frame: DB Period: From first dose of study drug up to 16 Weeks of treatment

Population: DB period: Safety analysis set included of all participants who were randomized and received at least 1 dose of study drug in DB period.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Treatment Emergent AEs of Special Interest (AESIs) (All Causality)2 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Treatment Emergent AEs of Special Interest (AESIs) (All Causality)1 Participants
Primary

Part 1, DB Period: Number of Participants With Treatment Emergent Serious Adverse Events (SAEs) (All Causality)

An 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state. SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; life-threatening experience (immediate risk of death); new or prolonged inpatient hospitalization; persistent or significant disability/incapacity; congenital anomaly/birth defect; suspected transmission via a Pfizer product of an infectious agent, pathogenic or non-pathogenic or other medical events judged by investigator.

Time frame: DB Period: From first dose of study drug up to 16 Weeks of treatment

Population: DB period: Safety analysis set included of all participants who were randomized and received at least 1 dose of study drug in DB period.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, DB Period: Number of Participants With Treatment Emergent Serious Adverse Events (SAEs) (All Causality)0 Participants
DB Period: PlaceboPart 1, DB Period: Number of Participants With Treatment Emergent Serious Adverse Events (SAEs) (All Causality)0 Participants
Primary

Part 1, DB Period: Percentage of Participants Achieving Investigator's Global Assessment (IGA) Response at Week 16

IGA measured AD severity, based on a 5-point scale (0-4); 0= AD is clear, 1= AD is almost clear, 2= mild AD, 3= moderate AD and 4= severe AD. IGA response was defined as participants achieving IGA 0 (clear) or 1 (almost clear) and a reduction of \>=2 points from baseline.

Time frame: DB Period: Week 16

Population: FAS included all participants who were randomized to the study irrespective of whether they received any dose of study intervention (i.e., etrasimod or placebo). Participants were analyzed in the treatment groups as they were randomized. Number of participants in FAS with baseline IGA\>=2 was included in this analysis.

ArmMeasureValue (NUMBER)
DB Period: Etrasimod 2 mgPart 1, DB Period: Percentage of Participants Achieving Investigator's Global Assessment (IGA) Response at Week 163.3 Percentage of Participants
DB Period: PlaceboPart 1, DB Period: Percentage of Participants Achieving Investigator's Global Assessment (IGA) Response at Week 167.1 Percentage of Participants
Comparison: Normal approximation adjusting for the stratification factor (disease severity as measured by baseline IGA score 3 \[moderate\], 4 \[severe\]) derived from clinical database via Cochran-Mantel-Haenszel (CMH) approach was used.p-value: =0.55895% CI: [-16.36, 8.83]Cochran-Mantel-Haenszel
Primary

Part 1, OLE Period: Number of Participants With Laboratory Test Abnormalities

Laboratory assessments included hematology, clinical chemistry, urinalysis, other parameters and reflex tests. Number of participants with abnormalities in any of laboratory parameters is reported.

Time frame: OLE Period: First dose of study drug in OLE period up to 4 weeks after last dose in OLE period (up to maximum of 56 Weeks)

Population: Safety analysis set included all participants who received at least 1 dose of study intervention (i.e., Etrasimod or placebo). Participants were analyzed in the treatment groups as they were randomized. Here, Number of Participants Analyzed signifies participants evaluable for this outcome measure.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Laboratory Test Abnormalities20 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Laboratory Test Abnormalities18 Participants
Primary

Part 1, OLE Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV Blocks

Standard 12-lead ECGs utilizing limb leads were used to measure PR interval, QT interval, QTcF, and QRS complex. Number of participants with non-zero ECG abnormalities and AV blocks are reported in this outcome measure.

Time frame: OLE Period: Day 169/Week 24

Population: Safety analysis set included all participants who received at least 1 dose of study intervention (i.e., Etrasimod or placebo). Participants were analyzed in the treatment groups as they were randomized. Here, Overall Number of Participants Analyzed signifies number of participants evaluable for the specified outcome measure.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksWeek 24: QTCF (msec), single beat:>= 450 (male) or >= 470 (female)1 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksWeek 24: CFB in QTcF: >30 sec increase1 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksWeek 24: CFB in QT: >30 msec increase2 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksWeek 24: CFB in QT: >60 msec increase1 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksWeek 24: CFB in QT: >60 msec increase0 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksWeek 24: QTCF (msec), single beat:>= 450 (male) or >= 470 (female)0 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksWeek 24: CFB in QT: >30 msec increase0 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal 12-Lead Electrocardiogram Measurements and AV BlocksWeek 24: CFB in QTcF: >30 sec increase0 Participants
Primary

Part 1, OLE Period: Number of Participants With Markedly Abnormal Vital Sign

Vital signs evaluation included SBP, DBP, pulse rate. Number of participants with non-zero vital signs abnormalities are reported in this outcome measure.

Time frame: OLE Period: Day 141/Week 20; Day 169/Week 24; Day 281/Week 40; Follow Up 1; Follow Up 2

Population: Safety analysis set included all participants who received at least 1 dose of study intervention (i.e., Etrasimod or placebo). Participants were analyzed in the treatment groups as they were randomized. Number Analyzed=participants evaluable for specified timepoints.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 20: SBP: Change:>=30 mmHg decrease0 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 24: Pulse rate: <60 bpm1 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 20: Pulse rate: <60 bpm1 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 32: DBP: >90 mmHg1 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 20: SBP: >150 mmHg1 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 40: DBP: >90 mmHg1 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 24: SBP: >150 mmHg0 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignFollow-up 1: DBP: >90 mmHg2 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 20: DBP: >90 mmHg2 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignFollow-up 1: Pulse rate: <60 bpm1 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 24: SBP: Change:>=30 mmHg decrease0 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignFollow-up 2: DBP: >90 mmHg2 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 24: DBP: >90 mmHg1 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignFollow-up 2: Pulse rate: <60 bpm1 Participants
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 24: DBP: Change>=20 mmHg decrease0 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignFollow-up 2: Pulse rate: <60 bpm2 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 24: DBP: >90 mmHg1 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 20: SBP: >150 mmHg1 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 20: SBP: Change:>=30 mmHg decrease1 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 20: DBP: >90 mmHg1 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 20: Pulse rate: <60 bpm0 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 24: SBP: >150 mmHg1 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 24: DBP: Change>=20 mmHg decrease1 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 24: Pulse rate: <60 bpm1 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 32: DBP: >90 mmHg0 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 40: DBP: >90 mmHg0 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignFollow-up 1: DBP: >90 mmHg0 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignFollow-up 1: Pulse rate: <60 bpm2 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignFollow-up 2: DBP: >90 mmHg0 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Markedly Abnormal Vital SignWeek 24: SBP: Change:>=30 mmHg decrease1 Participants
Primary

Part 1, OLE Period: Number of Participants With TEAEs (All Causality)

An 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state.

Time frame: OLE Period: First dose of study drug in OLE period up to 4 weeks after last dose in OLE period (up to maximum of 56 Weeks)

Population: Safety analysis set included all participants who received at least 1 dose of study intervention (i.e., Etrasimod or placebo). Participants were analyzed in the treatment groups as they were randomized.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With TEAEs (All Causality)9 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With TEAEs (All Causality)5 Participants
Primary

Part 1, OLE Period: Number of Participants With Treatment Emergent AEs (All Causality) Leading to Study Treatment Discontinuation

An 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state.

Time frame: OLE Period: First dose of study drug in OLE period up to 4 weeks after last dose in OLE period (up to maximum of 56 Weeks)

Population: Safety analysis set included all participants who received at least 1 dose of study intervention (i.e., Etrasimod or placebo). Participants were analyzed in the treatment groups as they were randomized.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Treatment Emergent AEs (All Causality) Leading to Study Treatment Discontinuation0 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Treatment Emergent AEs (All Causality) Leading to Study Treatment Discontinuation1 Participants
Primary

Part 1, OLE Period: Number of Participants With Treatment Emergent AESIs (All Causality)

An 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state. AESIs included here were cardiovascular events (i.e., bradycardia, AV conduction delay, and hypertension); macular edema, pulmonary events (airflow obstruction or decreased gas exchange); infections (severe infections, opportunistic infections \[including PML\], Herpes simplex and Herpes zoster); liver injury (liver transaminase elevation and/or bilirubin elevation); PRES and malignancies.

Time frame: OLE Period: First dose of study drug in OLE period up to 4 weeks after last dose in OLE period (up to maximum of 56 Weeks)

Population: Safety analysis set included all participants who received at least 1 dose of study intervention (i.e., Etrasimod or placebo). Participants were analyzed in the treatment groups as they were randomized.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Treatment Emergent AESIs (All Causality)1 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Treatment Emergent AESIs (All Causality)0 Participants
Primary

Part 1, OLE Period: Number of Participants With Treatment Emergent SAEs (All Causality)

An 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. Treatment-emergent are events between first dose of study drug and up to last dose that were absent before treatment or that worsened relative to pretreatment state. SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; life-threatening experience (immediate risk of death); new or prolonged inpatient hospitalization; persistent or significant disability/incapacity; congenital anomaly/birth defect; suspected transmission via a Pfizer product of an infectious agent, pathogenic or non-pathogenic or other medical events judged by investigator.

Time frame: OLE Period: First dose of study drug in OLE period up to 4 weeks after last dose in OLE period (up to maximum of 56 Weeks)

Population: Safety analysis set included all participants who received at least 1 dose of study intervention (i.e., Etrasimod or placebo). Participants were analyzed in the treatment groups as they were randomized.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
DB Period: Etrasimod 2 mgPart 1, OLE Period: Number of Participants With Treatment Emergent SAEs (All Causality)1 Participants
DB Period: PlaceboPart 1, OLE Period: Number of Participants With Treatment Emergent SAEs (All Causality)0 Participants
Secondary

Part 1, DB Period: Percentage of Participants Who Achieved >=75% Reduction From Baseline in Eczema Area and Severity Index (EASI) Score (EASI-75) at Week 16

EASI-75 response was defined as a 75% reduction or greater in EASI score from Baseline to Week 16. EASI quantified severity of AD based on severity of lesion clinical signs and percentage (%) of body surface area (BSA) affected. Severity of clinical signs of AD lesions (erythema \[E\], induration/papulation \[I\], excoriation \[Ex\] and lichenification \[L\]) were scored separately for each of 4 body regions (head and neck, upper limbs, trunk \[including axillae and groin)\] and lower limbs \[including buttocks\]) on a 4-point scale: 0= absent; 1= mild; 2= moderate; 3= severe. EASI area score was based on % BSA with AD in body region: 0 (0%), 1 (\>0 to \<10%), 2 (10 to \<30%), 3 (30 to \<50%), 4 (50 to \<70%), 5 (70 to \<90%) and 6 (90 to 100%). Total EASI score =0.1\*Ah\*(Eh+Ih+Exh+Lh) + 0.2\*Au\*(Eu+Iu+ExU+Lu) + 0.3\*At\*(Et+It+Ext+Lt) + 0.4\*Al\*(El+Il+Exl+Ll); A = EASI area score; h = head and neck; u = upper limbs; t = trunk; l = lower limbs.

Time frame: DB Period: Week 16

Population: FAS included all participants who were randomized to the study irrespective of whether they received any dose of study intervention (i.e., etrasimod or placebo). Participants were analyzed in the treatment groups as they were randomized.

ArmMeasureValue (NUMBER)
DB Period: Etrasimod 2 mgPart 1, DB Period: Percentage of Participants Who Achieved >=75% Reduction From Baseline in Eczema Area and Severity Index (EASI) Score (EASI-75) at Week 1623.3 Percentage of Participants
DB Period: PlaceboPart 1, DB Period: Percentage of Participants Who Achieved >=75% Reduction From Baseline in Eczema Area and Severity Index (EASI) Score (EASI-75) at Week 1614.3 Percentage of Participants
Comparison: Normal approximation adjusting for the stratification factor (disease severity as measured by baseline IGA score 3 \[moderate\], 4 \[severe\]) derived from clinical database via Cochran-Mantel-Haenszel (CMH) approach was used.p-value: =0.368595% CI: [-10.7, 28.85]Cochran-Mantel-Haenszel
Secondary

Part 1, DB Period: Percent Change From Baseline in EASI Score at Week 16

EASI quantified severity of AD based on severity of lesion clinical signs and percentage (%) of body surface area (BSA) affected. Severity of clinical signs of AD lesions (erythema \[E\], induration/papulation \[I\], excoriation \[Ex\] and lichenification \[L\]) were scored separately for each of 4 body regions (head and neck, upper limbs, trunk \[including axillae and groin)\] and lower limbs \[including buttocks\]) on a 4-point scale: 0= absent; 1= mild; 2= moderate; 3= severe. EASI area score was based on % BSA with AD in body region: 0 (0%), 1 (\>0 to \<10%), 2 (10 to \<30%), 3 (30 to \<50%), 4 (50 to \<70%), 5 (70 to \<90%) and 6 (90 to 100%). Total EASI score =0.1\*Ah\*(Eh+Ih+Exh+Lh) + 0.2\*Au\*(Eu+Iu+ExU+Lu) + 0.3\*At\*(Et+It+Ext+Lt) + 0.4\*Al\*(El+Il+Exl+Ll); A = EASI area score; h = head and neck; u = upper limbs; t = trunk; l = lower limbs.

Time frame: DB Period: Baseline, Week 16

Population: FAS included all participants who were randomized to the study irrespective of whether they received any dose of study intervention (i.e., etrasimod or placebo). Participants were analyzed in the treatment groups as they were randomized.

ArmMeasureValue (LEAST_SQUARES_MEAN)Dispersion
DB Period: Etrasimod 2 mgPart 1, DB Period: Percent Change From Baseline in EASI Score at Week 16-53.87 Percent changeStandard Error 9.007
DB Period: PlaceboPart 1, DB Period: Percent Change From Baseline in EASI Score at Week 16-24.65 Percent changeStandard Error 9.533
Comparison: Jump-to-Control (JTC) method was used for evaluation. A complete imputed dataset was analyzed using analysis of covariance model including effects of treatment group, actual stratification factor, and baseline value. Multiple results of the treatment comparison were combined using Rubin's rules, reporting the combined treatment difference, its standard error, 95% CI and 2-sided p-value, across the visits.p-value: =0.030395% CI: [-55.53, -2.9]Rubin's rule

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026