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A Study to Assess the Efficacy and Safety of XP23829 in Subjects With Moderate-to-Severe Chronic Plaque-Type Psoriasis

A Phase 2, Randomized, Double-Blind, Multicenter, Parallel-Group, Placebo-Controlled Study to Assess the Efficacy and Safety of Three Dose Levels of XP23829 in Subjects With Moderate-to-Severe Chronic Plaque-Type Psoriasis

Status
Completed
Phases
Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT02173301
Enrollment
200
Registered
2014-06-24
Start date
2014-06-30
Completion date
2015-08-31
Last updated
2022-04-12

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

Conditions

Psoriasis

Brief summary

The study objectives are the following: 1. To evaluate the efficacy of 3 doses of XP23829 compared to placebo for the treatment of moderate-to-severe chronic plaque-type psoriasis. 2. To evaluate the safety and tolerability of XP23829 in subjects with psoriasis. 3. To evaluate the pharmacodynamics (PD) of XP23829 through immunological analysis of peripheral blood samples.

Detailed description

Study Design : This is a , multi-center, double blind, placebo-controlled, phase 2 (dose-finding) efficacy and safety study in which subjects with moderate-to- severe chronic plaque-type psoriasis will be randomized in a 1:1:1:1 allocation ratio to 1 of 3 active doses of XP23829 or placebo. Approximately 50 subjects will be enrolled into each treatment group. Study Periods: The study includes a 4-week screening phase, a 12-week treatment phase (with 9 weeks of XP23829 or placebo at the maintenance dose), and a 4-week observational post-treatment follow-up phase. A treatment-free follow-up period is designed to evaluate safety and disease relapse and rebound. Specifically, the study periods are as follows: 1. Screening Phase: Weeks -4 through 0 2. Treatment phase included: 1. Titration Phase: Weeks 1 through 3 2. Double-Blind Maintenance Phase: Weeks 4 through 12 3. Post-treatment follow-up: Weeks 13 through 16 Efficacy assessments will be performed in the clinic at Baseline (Visit 2) and at the end of Weeks 2, 4, 8, 12, 14, and 16. Patient-reported outcome measures will be assessed in the clinic at Baseline and at Week 12. Blood samples for pharmacodynamic (PD) assessments will be collected at Baseline and at Weeks 4, 8, 12 and 16. PD assessments will be conducted in all subjects, with the intent of evaluating psoriasis-associated inflammatory markers.

Interventions

DRUGXP23829 400 mg QD

active dose 1

DRUGXP 23829 800 mg QD

active dose 2

DRUGXP23829 400 mg BID

active dose 3

DRUGPlacebo

control

Sponsors

XenoPort, Inc.
CollaboratorINDUSTRY
Dr. Reddy's Laboratories Limited
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
DOUBLE (Subject, Investigator)

Eligibility

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

Inclusion criteria

1. Male and female subjects, age ≥ 18. 2. Stable, moderate-to-severe plaque-type psoriasis diagnosed for at least 6 months prior to randomization (no morphology changes or significant flares of disease activity in the last 6 months in the opinion of the investigator). 3. Severity of disease meeting all of the following three criteria prior to randomization: 1. Psoriasis Area and Severity Index (PASI) score of 12 or greater 2. Total Body Surface Area (BSA) affected by plaque psoriasis of 10% or greater 3. Static Physician's Global Assessment (sPGA) score of 3 or greater 4. Must be a candidate for phototherapy and/or systemic therapy for psoriasis.

Exclusion criteria

1. Subjects with current inverse, erythrodermic, predominantly guttate, or pustular psoriasis. 2. Subjects with current drug-induced or drug-exacerbated psoriasis. 3. Subjects with moderate-to-severe psoriatic arthritis of any type; and subjects with mild psoriatic arthritis, who require systemic disease-modifying therapy. 4. Subjects with unstable or significant illness, including the presence of laboratory abnormalities at screening that in the opinion of the investigator would place the subject at unacceptable risk if he/she were to participate in the study. 5. Any skin condition (e.g. eczema) which confounds the ability to interpret data from the study. 6. Treatment with a topical anti-psoriatic therapy within 14 days prior to randomization (including topical steroids, topical vitamin A or D analog preparations, tacrolimus, pimecrolimus, or anthralin). 7. Phototherapy or prolonged sun exposure or use of ultraviolet (UV) light sources within 28 days of randomization. 8. Use of investigational or approved biologic treatments that are known to affect psoriasis, such as adalimumab, etanercept, golimumab or infliximab within 12 weeks of randomization and ustekinumab within 24 weeks of randomization. 9. Use of systemic medications (non-biologics) that are known to affect psoriasis (including but not limited to oral corticosteroids, cyclosporine, methotrexate, lithium, and beta-adrenergic blockers) within 4 weeks of randomization, or 5 half-lives, whichever is longer. 10. Prior treatment with Dimethyl Fumarate (Fumaderm® or Tecfidera®) or any other Fumaric Acid Ester (FAE) containing products. 11. Have failed (due to inadequate response) more than 3 approved systemic agents for the treatment of psoriasis.

Design outcomes

Primary

MeasureTime frameDescription
• The Percent Change in PASI (Psoriasis Area and Severity Index) Score From Baseline12 WeeksThe PASI is a measure of the average redness, thickness, and scaliness of the lesions (each graded on a 0-4 scale) and is weighted by the area of involvement. The minimum possible score on this scale is '0', while the maximum score on this scale is 72. A lower score on this scale at the end of the study indicates an improvement in the condition of subject.

Secondary

MeasureTime frameDescription
• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Weeks 2, 4, 8, 12, 14 and 16The percentage of subjects who achieve a reduction of 75% or greater from Baseline in the Psoriasis Area and Severity Index score (PASI-75) at efficacy assessments conducted at Weeks 2, 4, 8, 12, 14 and 16. The PASI is a measure of the average redness, thickness, and scaliness of the lesions (each graded on a 0-4 scale) and is weighted by the area of involvement. The minimum possible score on this scale is '0', while the maximum score on this scale is 72. A lower score on this scale at the end of the study indicates an improvement in the condition of subject.
• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeeks 2, 4, 8, 12, 14 and 16The Percentage of subjects who achieve the static Physician's Global Assessment (sPGA) score of 'clear' or 'almost clear' (sPGA score 0 or 1) at efficacy assessments conducted at Weeks 2, 4, 8, 12, 14 and 16. Score Grade : Definition - 0 Clear: No signs of psoriasis 1. Almost clear: No thickening to minimal plaque elevation; Normal to slight pink coloration/faint erythema; Focal to minimal scaling 2. Mild: Slight elevation/thickening; Pink to light red coloration; Predominantly fine scaling partially or mostly covering lesions 3. Moderate: Clearly distinguishable/distinct thickening; Definite red coloration; Coarse scaling covering most plaques 4. Severe: Marked thickening with hard/sharp edges; Bright to deep dark red coloration; Thick/coarse scaling covering almost all or all lesions A lower score on this scale at the end of the study indicates an improvement in the disease condition.

Countries

United States

Participant flow

Participants by arm

ArmCount
XP23829 400 mg QD (Once Daily)
After 4-week screening period, eligible subjects will be randomized to XP23829 400 mg QD for 12 weeks including titration period XP23829 400 mg QD: active dose 1
49
XP23829 800 mg QD (Once Daily)
After 4-week screening period, eligible subjects will be randomized to XP23829 800 mg QD for 12 weeks including titration period XP 23829 800 mg QD: active dose 2
55
XP23829 400 mg BID (Twice Daily)
After 4-week screening period, eligible subjects will be randomized to XP23829 400 mg BID for 12 weeks including titration period XP23829 400 mg BID: active dose 3
48
Placebo
After 4-week screening period, eligible subjects will be randomized to Placebo for 12 weeks Placebo: control
48
Total200

Withdrawals & dropouts

PeriodReasonFG000FG001FG002FG003
Overall StudyAdverse Event78135
Overall StudyLost to Follow-up4422
Overall StudyPhysician Decision0010
Overall StudyProtocol Violation0100
Overall StudySubject unable to return for week 16 assessment within Sponsor timelines for study completion1000
Overall StudyWithdrawal by Subject81048

Baseline characteristics

CharacteristicXP23829 800 mg QD (Once Daily)XP23829 400 mg QD (Once Daily)TotalPlaceboXP23829 400 mg BID (Twice Daily)
Age, Continuous47.7 years
STANDARD_DEVIATION 10.55
50.8 years
STANDARD_DEVIATION 11.89
50.3 years
STANDARD_DEVIATION 12.49
51.1 years
STANDARD_DEVIATION 13.66
51.8 years
STANDARD_DEVIATION 13.8
Baseline Body Surface Area involved23.79 percentage
STANDARD_DEVIATION 15.283
22.90 percentage
STANDARD_DEVIATION 13.324
24.04 percentage
STANDARD_DEVIATION 14.86
26.44 percentage
STANDARD_DEVIATION 16.26
23.08 percentage
STANDARD_DEVIATION 14.585
Baseline PASI score18.19 units on a scale
STANDARD_DEVIATION 7.977
18.32 units on a scale
STANDARD_DEVIATION 7.413
18.28 units on a scale
STANDARD_DEVIATION 7.082
19.13 units on a scale
STANDARD_DEVIATION 7.671
17.51 units on a scale
STANDARD_DEVIATION 4.791
Baseline sPGA
3 Moderate
39 Participants32 Participants139 Participants34 Participants34 Participants
Baseline sPGA
4 Severe
16 Participants17 Participants61 Participants14 Participants14 Participants
Body Weight101.68 kilograms
STANDARD_DEVIATION 26.142
95.22 kilograms
STANDARD_DEVIATION 25.71
98.85 kilograms
STANDARD_DEVIATION 26.007
97.08 kilograms
STANDARD_DEVIATION 25.136
101.08 kilograms
STANDARD_DEVIATION 27.207
Ethnicity (NIH/OMB)
Hispanic or Latino
7 Participants12 Participants31 Participants1 Participants11 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
48 Participants37 Participants169 Participants47 Participants37 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
0 Participants0 Participants0 Participants0 Participants0 Participants
Has Used Systemic Biologics?
No
34 Participants32 Participants131 Participants35 Participants30 Participants
Has Used Systemic Biologics?
Yes
21 Participants17 Participants69 Participants13 Participants18 Participants
Race (NIH/OMB)
American Indian or Alaska Native
1 Participants0 Participants3 Participants1 Participants1 Participants
Race (NIH/OMB)
Asian
2 Participants0 Participants3 Participants1 Participants0 Participants
Race (NIH/OMB)
Black or African American
3 Participants4 Participants10 Participants2 Participants1 Participants
Race (NIH/OMB)
More than one race
1 Participants1 Participants3 Participants0 Participants1 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
Unknown or Not Reported
0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
White
48 Participants44 Participants181 Participants44 Participants45 Participants
Sex: Female, Male
Female
23 Participants17 Participants70 Participants14 Participants16 Participants
Sex: Female, Male
Male
32 Participants32 Participants130 Participants34 Participants32 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
EG002
affected / at risk
EG003
affected / at risk
deaths
Total, all-cause mortality
0 / 490 / 550 / 480 / 48
other
Total, other adverse events
36 / 4942 / 5537 / 4829 / 48
serious
Total, serious adverse events
1 / 491 / 551 / 480 / 48

Outcome results

Primary

• The Percent Change in PASI (Psoriasis Area and Severity Index) Score From Baseline

The PASI is a measure of the average redness, thickness, and scaliness of the lesions (each graded on a 0-4 scale) and is weighted by the area of involvement. The minimum possible score on this scale is '0', while the maximum score on this scale is 72. A lower score on this scale at the end of the study indicates an improvement in the condition of subject.

Time frame: 12 Weeks

Population: modified Intent-to-Treat population Observed cases analysis

ArmMeasureValue (LEAST_SQUARES_MEAN)Dispersion
XP23829 400 mg QD (Once Daily)• The Percent Change in PASI (Psoriasis Area and Severity Index) Score From Baseline-38.1 percentage change from baselineStandard Error 5.07
XP23829 800 mg QD (Once Daily)• The Percent Change in PASI (Psoriasis Area and Severity Index) Score From Baseline-48.2 percentage change from baselineStandard Error 5.06
XP23829 400 mg BID (Twice Daily)• The Percent Change in PASI (Psoriasis Area and Severity Index) Score From Baseline-50.7 percentage change from baselineStandard Error 5.5
Placebo• The Percent Change in PASI (Psoriasis Area and Severity Index) Score From Baseline-25.0 percentage change from baselineStandard Error 5.06
p-value: 0.066Mixed Models Analysis
p-value: 0.001Mixed Models Analysis
p-value: <0.001Mixed Models Analysis
Secondary

• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)

The percentage of subjects who achieve a reduction of 75% or greater from Baseline in the Psoriasis Area and Severity Index score (PASI-75) at efficacy assessments conducted at Weeks 2, 4, 8, 12, 14 and 16. The PASI is a measure of the average redness, thickness, and scaliness of the lesions (each graded on a 0-4 scale) and is weighted by the area of involvement. The minimum possible score on this scale is '0', while the maximum score on this scale is 72. A lower score on this scale at the end of the study indicates an improvement in the condition of subject.

Time frame: Weeks 2, 4, 8, 12, 14 and 16

Population: modified Intent-to-treat population with last observation carried forward imputation for missing values

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
XP23829 400 mg QD (Once Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 21 Participants
XP23829 400 mg QD (Once Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 42 Participants
XP23829 400 mg QD (Once Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 83 Participants
XP23829 400 mg QD (Once Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 126 Participants
XP23829 400 mg QD (Once Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 146 Participants
XP23829 400 mg QD (Once Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 163 Participants
XP23829 800 mg QD (Once Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 163 Participants
XP23829 800 mg QD (Once Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 127 Participants
XP23829 800 mg QD (Once Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 20 Participants
XP23829 800 mg QD (Once Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 82 Participants
XP23829 800 mg QD (Once Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 40 Participants
XP23829 800 mg QD (Once Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 144 Participants
XP23829 400 mg BID (Twice Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 42 Participants
XP23829 400 mg BID (Twice Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 85 Participants
XP23829 400 mg BID (Twice Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 1210 Participants
XP23829 400 mg BID (Twice Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 166 Participants
XP23829 400 mg BID (Twice Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 146 Participants
XP23829 400 mg BID (Twice Daily)• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 20 Participants
Placebo• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 143 Participants
Placebo• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 162 Participants
Placebo• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 40 Participants
Placebo• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 124 Participants
Placebo• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 20 Participants
Placebo• Proportion of Subjects Who Achieve a Reduction of 75% or Greater From Baseline in PASI (PASI-75)Week 82 Participants
Comparison: Week 12 comparisonp-value: 0.501Regression, Logistic
Comparison: Week 12 comparisonp-value: 0.34Regression, Logistic
Comparison: Week 12 comparisonp-value: 0.075Regression, Logistic
Secondary

• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost Clear

The Percentage of subjects who achieve the static Physician's Global Assessment (sPGA) score of 'clear' or 'almost clear' (sPGA score 0 or 1) at efficacy assessments conducted at Weeks 2, 4, 8, 12, 14 and 16. Score Grade : Definition - 0 Clear: No signs of psoriasis 1. Almost clear: No thickening to minimal plaque elevation; Normal to slight pink coloration/faint erythema; Focal to minimal scaling 2. Mild: Slight elevation/thickening; Pink to light red coloration; Predominantly fine scaling partially or mostly covering lesions 3. Moderate: Clearly distinguishable/distinct thickening; Definite red coloration; Coarse scaling covering most plaques 4. Severe: Marked thickening with hard/sharp edges; Bright to deep dark red coloration; Thick/coarse scaling covering almost all or all lesions A lower score on this scale at the end of the study indicates an improvement in the disease condition.

Time frame: Weeks 2, 4, 8, 12, 14 and 16

Population: modified 'Intent-to-treat' population using Last Observation Carried Forward method to impute missing observations

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
XP23829 400 mg QD (Once Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 20 Participants
XP23829 400 mg QD (Once Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 41 Participants
XP23829 400 mg QD (Once Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 82 Participants
XP23829 400 mg QD (Once Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 125 Participants
XP23829 400 mg QD (Once Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 145 Participants
XP23829 400 mg QD (Once Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 165 Participants
XP23829 800 mg QD (Once Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 161 Participants
XP23829 800 mg QD (Once Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 123 Participants
XP23829 800 mg QD (Once Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 20 Participants
XP23829 800 mg QD (Once Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 82 Participants
XP23829 800 mg QD (Once Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 41 Participants
XP23829 800 mg QD (Once Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 142 Participants
XP23829 400 mg BID (Twice Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 40 Participants
XP23829 400 mg BID (Twice Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 81 Participants
XP23829 400 mg BID (Twice Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 123 Participants
XP23829 400 mg BID (Twice Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 164 Participants
XP23829 400 mg BID (Twice Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 143 Participants
XP23829 400 mg BID (Twice Daily)• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 20 Participants
Placebo• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 141 Participants
Placebo• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 161 Participants
Placebo• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 40 Participants
Placebo• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 122 Participants
Placebo• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 20 Participants
Placebo• Proportion of Subjects Who Achieve a sPGA (Static Physician's Global Assessment) Score of Clear or Almost ClearWeek 82 Participants
Comparison: Week 12 comparisonp-value: 0.229Regression, Logistic
Comparison: Week 12 comparisonp-value: 0.604Regression, Logistic
Comparison: Week 12 comparisonp-value: 0.573Regression, Logistic

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