Treatment of Cognitive Impairment in Men With Schizophrenia (MK5757-005)(COMPLETED)

Study Overview
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Brief Summary
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This study is to evaluate the safety and efficacy of the study drug compared to placebo in the treatment of cognitive impairment in men with schizophrenia.

Official Title
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A Phase IIa, Randomized, Double-Blind, Placebo-Controlled, Add-On Therapy, 2-Period Cross-Over Clinical Trial to Evaluate the Safety and Efficacy of MK5757 for the Treatment of Cognitive Impairment in Men With Schizophrenia

Conditions
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Schizophrenia

Intervention / Treatment
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* Drug: MK5757
* Drug: Comparator: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patient is male between 21 and 55 years of age Duration of the illness must be longer than 1 year Patient's current antipsychotic medication regimen must be stable Patient is negative for selected drugs of abuse at Screening Must be in a stable living arrangement for at least 3 months prior to screening (not a homeless shelter) Exclusion Criteria: Patient has mental retardation Undergone Electroconvulsive Therapy (ECT) treatment within 6 months prior to screening Has suicidal attempts or ideation within the last 12 months Patient has a history of alcohol/drug dependence within 1 year or alcohol/drug abuse within 12 months of starting the study

Ages Eligible for Study
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Minimum Age: 21 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 1<br>MK5757 | Drug: MK5757<br>* This is a 2 period, cross-over study. In each of the two treatment periods, each patient will receive the following: Days 1 and 28 MK5757 25 mg capsules three times a day (tid). Days 2 through 14 and Days 29 through 42 MK5757 50 mg capsules tid. Study drug is taken 3 times daily. Each treatment period is 14 days<br>|
| Placebo Comparator: 2<br>Placebo | Drug: Comparator: Placebo<br>* This is a 2 period, cross-over study. In each of the two treatment periods, each patient will receive the following: Days 1 and 28 MK5757 one placebo capsules three times a day (tid). Days 2 through 14 and Days 29 through 42 two MK5757 placebo capsules tid. Study drug is taken 3 times daily. Each treatment period is 14 days.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Mean Change From Baseline in the Composite Score From the Brief Assessment of Cognition in Schizophrenia (BACS) Battery After 2 Weeks of Treatment | The Brief Assessment of Cognition in Schizophrenia (BACS) was used to evaluate cognitive impairment, as measured by the mean change from baseline after 2 weeks of treatment in the composite score. The BACS composite score was calculated by averaging scores from the BACS subtests, including Verbal Memory, Digit Sequencing, Token Motor, Symbol Coding, Verbal Fluency (Semantic Fluency and Letter Fluency) and Tower of London. The possible minimum and maximum scores for change from baseline at two weeks of treatment for the endpoint are -111.5 and 111.5, respectively. | Baseline and Week 2 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Mean Change From Baseline After 2 Weeks of Treatment in the CogState Composite Score | CogState Schizophrenia Battery was used to evaluate cognitive impairment, as measured by the mean change from baseline after 2 weeks of treatment in the composite score. The composite score was comprised of 4 modules from the CogState Schizophrenia Battery: Identification Task, Detection Task, One Card Learning Task and Groton Maze Learning Task. Composite score was calculated by averaging all available standardized tests scores for the specified tests. The possible minimum and maximum scores for change from baseline at 2 weeks of treatment for the endpoint are -347.5 and 347.5, respectively. | Baseline and week 2 | 
| Mean Change From Baseline After 2 Weeks of Treatment in the Executive Functioning Composite Score | The Executive Functioning Composite Score was comprised of the following tests: Groton Maze Learning Task from the CogState Schizophrenia Battery and Tower of London, Semantic Fluency and Letter Fluency tests from the BACS. The composite score was calculated by averaging all of the available standardized tests scores for the specified tests. The possible minimum and maximum scores for change from baseline at two weeks of treatment for the endpoint are -253.4 and 253.4, respectively. | Baseline and Week 2 | 
| Mean Change From Baseline After 2 Weeks of Treatment in the Episodic Memory Composite Score | The Episodic Memory Composite Score was comprised of the following tests: Continuous Paired Associate Learning Task and One Card Learning Task from the CogState Schizophrenia Battery and the Verbal Memory test from the BACS. The composite score was calculated by averaging all of the available standardized tests scores for the specified tests. The possible minimum and maximum scores for change from baseline at two weeks of treatment for the endpoint are -207.06 and 207.06, respectively. | Baseline and Week 2 | 
| Mean Change From Baseline After 2 Weeks of Treatment in the Working Memory Composite Score | The Working Memory Composite Score was comprised of the following tests: Two-Back Memory Task from the CogState Schizophrenia Battery and the Digit Sequencing test from the BACS. The composite score was calculated by averaging all of the available standardized tests scores for the specified tests. The possible minimum and maximum scores for change from baseline at two weeks of treatment for the endpoint are -27.06 and 27.06, respectively. | Baseline and Week 2 | 
| Mean Change From Baseline After 2 Weeks of Treatment in the Attention/Processing Speed Composite Score | The Attention/Processing Speed Composite Score was comprised of the following tests: Identification Task and the Detection Task from the CogState Schizophrenia Battery and the Symbol Coding test from the BACS. The composite score was calculated by averaging all of the available standardized tests scores for the specified tests. The possible minimum and maximum scores for change from baseline at two weeks of treatment for the endpoint are -287.15 and 287.15, respectively. | Baseline and Week 2 |