Phase 2a Study of Efficacy and Safety of OpSCF in Moderate to Severe AD (Atopic Dermatitis)

A Randomized, Double-blind, Placebo-controlled, Phase 2a Study to Evaluate the Efficacy and Safety of OpSCF in the Treatment of Adult Subjects With Moderate to Severe Atopic Dermatitis

The purpose of this study is to determine the efficacy and safety of a monoclonal antibody, OpSCF, in the treatment of adults with moderate to severe Atopic Dermatitis (Eczema). OpSCF will be compared to a placebo. OpSCF or placebo will be administered every 2 weeks for 14 weeks, and the efficacy will be assessed two weeks later. After that, subjects may choose to enter an Open Label Extension phase in which all subjects will receive OpSCF every 4 weeks for 40 additional weeks.

Study Overview

• Status: Completed
• Conditions: Atopic Dermatitis
• Intervention / Treatment: Biological: OpSCF; Biological: Placebo

• Study Type: Interventional
• Enrollment (Actual): 50
• Phase: Phase 2

Contacts and Locations

Study Locations

• Canada
  • Ontario
    • Oshawa, Ontario, Canada, L1H 1B9
      • Oshawa Clinic Dermatology Trials
    • Toronto, Ontario, Canada, M4W 2N2
      • Research Toronto
  • Quebec
    • Montreal, Quebec, Canada, H2X 2V1
      • Innovaderm Research Inc
    • Québec, Quebec, Canada, G1W 4R4
      • Centre de Recherche Saint-Louis
• United States
  • Alabama
    • Birmingham, Alabama, United States, 33607
      • Cahaba Dermatology & Skin Health Center
  • California
    • Fountain Valley, California, United States, 92708
      • First OC Dermatology Research
    • Inglewood, California, United States, 90301
      • Axon Clinical Research
    • San Diego, California, United States, 92123
      • University Clinical Trials
    • Sherman Oaks, California, United States, 91403
      • Unison Clinical Trials
  • Florida
    • Boca Raton, Florida, United States, 33456
      • Skin Care Research
    • Miami, Florida, United States, 33173
      • Skin Research of South Florida
    • Miami Lakes, Florida, United States, 33014
      • RM Medical Research
    • Tampa, Florida, United States, 33607
      • Advanced Clinical Research Institute
  • Illinois
    • Rolling Meadows, Illinois, United States, 60008
      • Arlington Dermatology
  • Indiana
    • West Lafayette, Indiana, United States, 47906
      • Options Research Group
  • Kentucky
    • Louisville, Kentucky, United States, 40241
      • DS Research of Kentucky
  • Michigan
    • Auburn Hills, Michigan, United States, 48326
      • Oakland Hills Dermatology P.C
    • Bay City, Michigan, United States, 48706
      • Saginaw Bay Dermatology
  • Nevada
    • Reno, Nevada, United States, 89509
      • Skin Cancer and Dermatology Institute
  • New York
    • Kew Gardens, New York, United States, 11415
      • Forest Hills Dermatology Group
  • Texas
    • Frisco, Texas, United States, 75034
      • Rodgers Dermatology
  • Washington
    • Bellevue, Washington, United States, 98004
      • Dermatology Of Seattle

Participation Criteria

Eligibility Criteria

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

Description

Inclusion Criteria:

• Subject has clinically confirmed diagnosis of active AD.
• Subject has at least a 6-month history of AD
• Subject is willing to use effective birth control

Exclusion Criteria:

• Subject is a female who is breastfeeding, pregnant, or who is planning to become pregnant during the study.
• Subject has any clinically significant medical condition that would put the subject at undue risk or interfere with interpretation of study results.
• Subject has used dupilumab within 26 weeks prior to Day 1.
• Subject has used tralokinumab within 12 weeks prior to Day 1.

NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Quadruple

Number of Arms

4

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: OpSCF 600 mg; Participants received OpSCF 600 milligrams (mg), once every 2 weeks (Q2W), subcutaneously (SC), up to 14 weeks in the placebo-controlled period.	Biological: OpSCF; Administered SC.; Other Names: Humanized IgG4k, SCF248
Placebo Comparator: OpSCF Matching-Placebo; Participants received OpSCF matching-placebo, Q2W, SC, up to 14 weeks in the placebo-controlled period.	Biological: Placebo; Administered SC.
Experimental: OpSCF 600 mg/OpSCF 600mg; Participants who received OpSCF 600 mg and completed placebo-controlled treatment received OpSCF 600mg, once every 4 weeks (Q4W), SC, up to 36 weeks in the open-label extension (OLE) period.	Biological: OpSCF; Administered SC.; Other Names: Humanized IgG4k, SCF248; Biological: Placebo; Administered SC.
Placebo Comparator: OpSCF Matching-Placebo/OpSCF 600 mg; Participants who received OpSCF matching-placebo and completed placebo-controlled treatment received OpSCF 600mg, Q4W, SC, up to 36 weeks in the OLE period.	Biological: OpSCF; Administered SC.; Other Names: Humanized IgG4k, SCF248; Biological: Placebo; Administered SC.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Percent Change From Baseline in Eczema Area and Severity Index (EASI) at Week 16	The EASI quantifies the severity of a participant's AD based on both lesion severity and the % of body surface area (BSA) affected. Severity of clinical signs of AD lesions (erythema [E], induration/papulation[I], excoriation[Ex] & lichenification[L]) was scored separately for each of 4 body regions[head(h), upper extremities(u), trunk(t), lower extremities(l)] 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(no involvement), 1(< 10%),2 (10 to <30%), 3(30 to <50%), 4(50 to <70%), 5(70 to <90%) and 6(90 to 100%). The EASI score is obtained as: EASI(A) = 0.1*(Eh+Ih+Exh+Lh)*Ah + 0.2*(Eu+Iu+Exu+Lu)*Au + 0.3*(Et +It+Ext+Lt)*At + 0.4*(El+Il+Exl+Ll)*Al. Total EASI score = 0.0 to 72.0; higher scores indicate greater severity of AD. Here, a negative change from baseline indicates less severity in AD.	Baseline, Week 16

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of Participants Who Experienced At-Least One Treatment Emergent Adverse Event (TEAE) and Serious Adverse Events (SAEs)	An adverse event (AE) was any untoward medical occurrence in participant administered a pharmaceutical product & that does not necessarily have a causal relationship with this treatment. It can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a study product, whether or not considered related to the study product. An SAE was any untoward medical occurrence that, at any dose resulted in death, was life-threatening, required in-patient hospitalization or prolongation of existing hospitalization resulted in persistent or significant disability/incapacity & was a congenital anomaly/birth defect. Any AE starting on or after the first dose date will be considered TEAE.	From first dose of study drug up to end of follow-up (up to Week 67)
Percent Change From Baseline in EASI at Weeks 2, 4, 6, 8, 10, 12, and 14	The EASI quantifies the severity of a participant's AD based on both lesion severity and the % of body surface area (BSA) affected. Severity of clinical signs of AD lesions (erythema [E], induration/papulation[I], excoriation[Ex] & lichenification[L]) was scored separately for each of 4 body regions[head(h), upper extremities(u), trunk(t), lower extremities(l)] 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(no involvement), 1(< 10%),2 (10 to <30%), 3(30 to <50%), 4(50 to <70%), 5(70 to <90%) and 6(90 to 100%). The EASI score is obtained as: EASI(A) = 0.1*(Eh+Ih+Exh+Lh)*Ah + 0.2*(Eu+Iu+Exu+Lu)*Au + 0.3*(Et +It+Ext+Lt)*At + 0.4*(El+Il+Exl+Ll)*Al. Total EASI score = 0.0 to 72.0; higher scores indicate greater severity of AD. Here, a negative change from baseline indicates less severity in AD.	Baseline, Weeks 2, 4, 6, 8, 10, 12 and 14
Change From Baseline in EASI at Weeks 2, 4, 6, 8, 10, 12, 14, and 16	The EASI quantifies the severity of a participant's AD based on both lesion severity and the % of body surface area (BSA) affected. Severity of clinical signs of AD lesions (erythema [E], induration/papulation[I], excoriation[Ex] & lichenification[L]) was scored separately for each of 4 body regions[head(h), upper extremities(u), trunk(t), lower extremities(l)] 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(no involvement), 1(< 10%),2 (10 to <30%), 3(30 to <50%), 4(50 to <70%), 5(70 to <90%) and 6(90 to 100%). The EASI score is obtained as: EASI(A) = 0.1*(Eh+Ih+Exh+Lh)*Ah + 0.2*(Eu+Iu+Exu+Lu)*Au + 0.3*(Et +It+Ext+Lt)*At + 0.4*(El+Il+Exl+Ll)*Al. Total EASI score = 0.0 to 72.0; higher scores indicate greater severity of AD. Here, a negative change from baseline indicates less severity in AD.	Baseline, Weeks 2, 4, 6, 8, 10, 12, 14, and 16
Percentage of Participants Achieving At-Least 50% Improvement From Baseline in EASI (EASI50)	The EASI quantifies severity of a participant's AD based on both lesion severity & % of body surface area (BSA) affected. Severity of clinical signs of AD lesions (erythema [E], induration/papulation[I], excoriation[Ex] & lichenification[L]) was scored separately for each of 4 body regions[head(h), upper extremities(u), trunk(t), lower extremities(l)] 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(no involvement), 1(< 10%),2 (10 to <30%), 3(30 to <50%), 4(50 to <70%), 5(70 to <90%) & 6(90 to 100%). EASI score is obtained as: EASI(A) = 0.1*(Eh+Ih+Exh+Lh)*Ah + 0.2*(Eu+Iu+Exu+Lu)*Au + 0.3*(Et +It+Ext+Lt)*At + 0.4*(El+Il+Exl+Ll)*Al. Total EASI score = 0.0 to 72.0; higher scores indicate greater severity of AD. Here, a negative change from baseline indicates less severity in AD. EASI 50 response was defined as at least a 50% improvement in EASI relative to Baseline. 90% CI was based on exact Clopper-Pearson method.	At Weeks 2, 4, 6, 8, 10, 12, 14, and 16
Percentage of Participants Achieving At-Least 75% Improvement From Baseline in EASI (EASI75)	The EASI quantifies severity of a participant's AD based on both lesion severity & % of body surface area (BSA) affected. Severity of clinical signs of AD lesions (erythema [E], induration/papulation[I], excoriation[Ex] & lichenification[L]) was scored separately for each of 4 body regions[head(h), upper extremities(u), trunk(t), lower extremities(l)] 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(no involvement), 1(< 10%),2 (10 to <30%), 3(30 to <50%), 4(50 to <70%), 5(70 to <90%) & 6(90 to 100%). EASI score is obtained as: EASI(A) = 0.1*(Eh+Ih+Exh+Lh)*Ah + 0.2*(Eu+Iu+Exu+Lu)*Au + 0.3*(Et +It+Ext+Lt)*At + 0.4*(El+Il+Exl+Ll)*Al. Total EASI score = 0.0 to 72.0; higher scores indicate greater severity of AD. Here, a negative change from baseline indicates less severity in AD. EASI 75 response was defined as at least a 75% improvement in EASI relative to Baseline. 90% CI was based on exact Clopper-Pearson method.	At Weeks 2, 4, 6, 8, 10, 12, 14, and 16
Percentage of Participants Achieving At-Least 90% Improvement From Baseline in EASI (EASI90)	The EASI quantifies severity of a participant's AD based on both lesion severity & % of body surface area (BSA) affected. Severity of clinical signs of AD lesions (erythema [E], induration/papulation[I], excoriation[Ex] & lichenification[L]) was scored separately for each of 4 body regions[head(h), upper extremities(u), trunk(t), lower extremities(l)] 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(no involvement), 1(< 10%),2 (10 to <30%), 3(30 to <50%), 4(50 to <70%), 5(70 to <90%) & 6(90 to 100%). EASI score is obtained as: EASI(A) = 0.1*(Eh+Ih+Exh+Lh)*Ah + 0.2*(Eu+Iu+Exu+Lu)*Au + 0.3*(Et +It+Ext+Lt)*At + 0.4*(El+Il+Exl+Ll)*Al. Total EASI score = 0.0 to 72.0; higher scores indicate greater severity of AD. Here, a negative change from baseline indicates less severity in AD. EASI 90 response was defined as at least a 90% improvement in EASI relative to Baseline. 90% CI was based on exact Clopper-Pearson method.	At Weeks 2, 4, 6, 8, 10, 12, 14, and 16
Percentage of Participants Achieving At-Least a 2-grade Reduction From Baseline to Clear (0) or Almost Clear (1) in Validated Investigator Global Assessment for Atopic Dermatitis (vIGA-AD)	The vIGA-AD was assessed by the principal investigator or sub-investigator using the descriptors that best described the overall appearance of the lesions. It is a 5-point morphological assessment of overall disease severity that ranges from 0 to 4, where 0 = Clear; No inflammatory signs of atopic dermatitis 1 = Almost clear; Barely perceptible erythema, barely perceptible induration/papulation, and/or minimal lichenification 2 = Mild; Slight but definite erythema (pink), slight but definite induration/papulation, and/ or slight but definite lichenification 3 = Moderate; Clearly perceptible erythema (dull red), clearly perceptible induration/papulation, and/or clearly perceptible lichenification 4 = Severe; Marked erythema (deep or bright red), marked induration/ papulation, and/or marked lichenification. Percentage of participants who achieved at least a 2-grade reduction from baseline to clear (0) or Almost Clear (1) in vIGA-AD are reported here.	At Weeks 2, 4, 6, 8, 10, 12, 14, and 16
Percentage of Participants Achieving At-Least a 2-grade Reduction From Baseline in vIGA-AD	The vIGA-AD was assessed by the principal investigator or sub-investigator using the descriptors that best described the overall appearance of the lesions. It is a 5-point morphological assessment of overall disease severity that ranges from 0 to 4, where 0 = Clear; No inflammatory signs of atopic dermatitis 1 = Almost clear; Barely perceptible erythema, barely perceptible induration/papulation, and/or minimal lichenification 2 = Mild; Slight but definite erythema (pink), slight but definite induration/papulation, and/ or slight but definite lichenification 3 = Moderate; Clearly perceptible erythema (dull red), clearly perceptible induration/papulation, and/or clearly perceptible lichenification 4 = Severe; Marked erythema (deep or bright red), marked induration/ papulation, and/or marked lichenification. The percentage of participants with reduction from baseline of ≥2 grade in vIGA-AD score has been reported.	At Weeks 2, 4, 6, 8, 10, 12, 14, and 16
Change From Baseline in Weekly Average of the Daily Peak Pruritus Numeric Rating Scale (PP-NRS)	PP-NRS is based on the Numeric Rating Scale which was used to assess the level of itch the participant was experiencing. The following question was asked to participants: "On a scale of 0 to 10, with 0 = "no itch" and 10 = "worst itch imaginable", how would you rate your itch at the worst moment during the previous 24 hours?" Based on the score provided by participant, the PP-NRS score was assigned. Higher score indicates more severity. A negative change from baseline indicates improvement.	Baseline, Weeks 2, 4, 6, 8, 10, 12, 14, and 16
Percent Change From Baseline in Weekly Average of the Daily PP-NRS	PP-NRS is based on the Numeric Rating Scale which was used to assess the level of itch the participant was experiencing. The following question was asked to participants: "On a scale of 0 to 10, with 0 = "no itch" and 10 = "worst itch imaginable", how would you rate your itch at the worst moment during the previous 24 hours?" Based on the score provided by participant, the PP-NRS score was assigned. Higher score indicates more severity. A negative change from baseline indicates improvement.	Baseline, Weeks 2, 4, 6, 8, 10, 12, 14, and 16
Percentage of Participants Achieving At-Least a 4-point Reduction From Baseline in Weekly Average of the Daily PP-NRS	PP-NRS is based on the Numeric Rating Scale which was used to assess the level of itch the participant was experiencing. The following question was be asked to participants: "On a scale of 0 to 10, with 0 = "no itch" and 10 = "worst itch imaginable", how would you rate your itch at the worst moment during the previous 24 hours?" Based on the score provided by participant, the PP-NRS score was assigned. Higher score indicates more severity. A negative change from Baseline indicates improvement. The percentage of participants who had at least a 4-point reduction in the NRS score at post-baseline visits has been reported.	Baseline, Weeks 2, 4, 6, 8, 10, 12, 14, and 16
Change From Baseline in Body Surface Area (BSA) Involved With Atopic Dermatitis (AD)	The overall BSA affected by AD was evaluated (from 0% to 100%). It was calculated using the palm surface area method. This method states that palmar surface of 1 hand (using the participant's hand and including the fingers) represents 1% of his or her total BSA.	Baseline, Weeks 2, 4, 6, 8, 10, 12, 14, and 16
Percent Change From Baseline in BSA Involved With AD	The overall BSA affected by AD was evaluated (from 0% to 100%). It was calculated using the palm surface area method. This method states that palmar surface of 1 hand (using the participant's hand and including the fingers) represents 1% of his or her total BSA.	Baseline, Weeks 2, 4, 6, 8, 10, 12, 14, and 16
Change From Baseline in Atopic Dermatitis Control Tool (ADCT) at Weeks 2, 4, 8, 12, and 16	ADCT questionnaire is a self-assessment comprised of 6 concise questions to evaluate participant's perceptions of AD symptoms and impacts on their life and function over the last week. Each question carries equal weight and is scored from 0 to 4, for a total score ranging between 0 and 24. Higher score indicates higher severity. A negative change from baseline indicates improvement.	Baseline, Weeks 2, 4, 8,12 and 16
Change From Baseline in Patient-Oriented Eczema Measure (POEM) at Weeks 2, 4, 8, 12, and 16	POEM is a self-assessment of disease severity using 7 questions asked to participant. A maximum value of 28 can be assigned based on the participant's response to 7 questions scored from 0 to 4, where 0 = No days, 1 = 1-2 days, 2 = 3-4 days, 3 = 5-6 days and 4 = Every day. Higher score indicates high severity. A negative change from baseline indicates improvement.	Baseline, Weeks 2, 4, 8,12 and 16
Change From Baseline in Dermatology Life Quality Index (DLQI) at Weeks 2, 4, 8, 12, and 16	DLQI is a 10 questions questionnaire to measure how much skin problems have affected a participant's life over the last week. Each question is scored from 0 to 3 (0 = Not at all, 1 = A little, 2 = A lot and 3 = Very much). The DLQI is calculated by summing the score of each question, giving a total score ranging from 0 (not at all) to 30 (very much). The higher the score the more quality of life is impaired. A negative change from baseline indicates improvement in QoL.	Baseline, Weeks 2, 4, 8,12 and 16
Placebo-controlled Period: Serum Concentrations of OpSCF Over Time		Days 15, 29, 43, 57, 85, 99, 102, 106 and 113
OLE Period: Serum Concentrations of OpSCF Over Time		Days 141, 169, 197, 225, 253, 281, 309 and 337

Other Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change from baseline in blood biomarkers and IgE at Weeks 4, 8, 12, and 16	Blood tests	16 weeks
Change from baseline in skin biomarkers collected using skin biopsies at Weeks 4 and 16 (optional for consenting subjects)	Histopathological examination	16 weeks
Change from baseline in skin biomarkers collected using tape strips at Weeks 4 and 16 (optional for consenting subjects)	Analysis of proteomics and mRNA levels	16 weeks

Collaborators and Investigators

• Sponsor: Insmed Incorporated
• Collaborators: Innovaderm Research Inc.
• Investigators: Study Director: Study Director, Insmed Incorporated

Study record dates

Study Major Dates

• Study Start (Actual): November 21, 2023
• Primary Completion (Actual): September 3, 2024
• Study Completion (Actual): August 18, 2025

Study Registration Dates

• First Submitted: October 19, 2023
• First Submitted That Met QC Criteria: October 25, 2023
• First Posted (Actual): October 26, 2023

Study Record Updates

• Last Update Posted (Actual): September 11, 2026
• Last Update Submitted That Met QC Criteria: August 17, 2026
• Last Verified: August 1, 2026

More Information

Terms related to this study

• Keywords: Monoclonal Antibody; Eczema
• Additional Relevant MeSH Terms: Genetic Diseases, Inborn; Immune System Diseases; Hypersensitivity, Immediate; Hypersensitivity; Skin Diseases; Skin Diseases, Genetic; Skin Diseases, Eczematous; Dermatitis; Congenital, Hereditary, and Neonatal Diseases and Abnormalities; Skin and Connective Tissue Diseases; Dermatitis, Atopic; Eczema
• Other Study ID Numbers: OpSCF-201

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

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