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TC-5619 as Augmentation Therapy to Improve Cognition in Outpatients With Cognitive Dysfunction in Schizophrenia

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT01003379
Recruitment Status : Completed
First Posted : October 28, 2009
Last Update Posted : September 13, 2013
Information provided by (Responsible Party):
Targacept Inc.

Brief Summary:

Schizophrenia affects approximately 1% of the population worldwide, and in about 80% of cases, it is a lifelong, disabling illness. It is a multi-dimensional disease that is associated with symptoms that have been characterized as positive, negative, and cognitive. CDS is a core feature of schizophrenia, and most individuals with schizophrenia exhibit cognitive impairment. Attention disorders, slow information processing, working memory disorders, and lack of flexibility for adaptive strategies are symptoms of cognitive impairment that have a devastating impact on the function, employment, and social status of patients with schizophrenia.

Older typical neuroleptic medications (e.g., haloperidol, fluphenazine) do not improve cognition. In fact, haloperidol has been shown to induce cognitive impairment in schizophrenic patients.

Novel atypical antipsychotics, such as risperidone, clozapine, and olanzapine, seem to produce gains in cognition. This improvement may reflect a diminution of extrapyramidal side effects of the typical high potency neuroleptics. Alternatively, it might reflect more effective symptom reduction by the novel antipsychotics, or direct cognitive enhancement through the effects of the newer agents on a variety of neurotransmitters, their receptors, and gene expression. Even when the newer antipsychotic medications improve cognition, they do not normalize it.

Presently, there are no approved therapies for CDS. However, in schizophrenic patients, nicotine improves multiple cognitive domains, including working memory and attention. Furthermore, based on a strong body of evidence ranging from genetic mapping to clinical trials, the alpha7 NNR subtype has emerged as a primary therapeutic target relevant to CDS and other core symptoms of schizophrenia

Condition or disease Intervention/treatment Phase
Cognitive Dysfunction Schizophrenia Drug: TC-5619 Drug: Placebo Phase 2

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 184 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Double-Blind, Randomized, Placebo-Controlled, Multicenter, Fixed Dose Study to Assess Efficacy, Safety, and Tolerability of TC-5619 as Augmentation Therapy to Improve Cognition in Outpatients With Cognitive Dysfunction in Schizophrenia
Study Start Date : October 2009
Actual Primary Completion Date : November 2010
Actual Study Completion Date : December 2010

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Schizophrenia

Arm Intervention/treatment
Experimental: TC-5619
TC-5619 capsules will be administered once a day in a forced titration scheme at 1 mg for 4 weeks, 5 mg for 4 weeks and 25 mg for 4 weeks (12 weeks total).
Drug: TC-5619
TC-5619-238 will be provided as hard gelatin capsules in strengths of 1mg, 5mg, and 25mg.

Placebo Comparator: Placebo Drug: Placebo
Placebo will be provided with exactly the same shape, size and appearance.

Primary Outcome Measures :
  1. To assess the efficacy of TC-5619 as augmentation therapy to quetiapine or risperidone, to improve cognition in stable outpatients with Cognitive Dysfunction in Schizophrenia (CDS), using the GML test of the CogState Schizophrenia Test Battery (CSTB). [ Time Frame: Day 1 - Week 4; Week 4 - Week 8; and finally Week 8 - Week 12. There will be a 2-week follow-up period following the end of the treatment period. ]

Secondary Outcome Measures :
  1. Assess the efficacy, safety and tolerability of TC-5619 administered adjunctively with quetiapine or risperidone, evaluate the pharmacokinetics of TC-5619 and plasma levels of quetiapine and risperidone/9-OH-risperidone. [ Time Frame: Day 1 - Week 4; Week 4 - Week 8; and finally Week 8 - Week 12. There will be a 2-week follow-up period following the end of the treatment period. ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Diagnosis of schizophrenia, per DSM-IV TR criteria, as aided by the MINI International Neuropsychiatric Interview (MINI)
  • Controlled schizophrenia, on same dose of quetiapine or risperidone for no less than 2 months prior to screening
  • Age 18 - 60, male or female
  • Stable schizophrenia as documented by lack of psychiatric hospitalization for 2 months prior to Screening
  • Clinical history of stable psychotic symptoms for 1 month prior to Screening
  • Stable positive symptoms of schizophrenia for 4 weeks prior to Day 1, as shown by score ≤ 4 on PANSS for items related to delusion, hallucination, conceptual disorganization, and unusual thought content, at Screening and at Day 1
  • Calgary Depression Scale for Schizophrenia score < 6
  • Outpatient with stable housing, and presence of an informant who sees the subject at least 4 times weekly
  • Able to understand and sign informed consent

Exclusion Criteria:

  • Diagnosis of schizoaffective or schizophreniform disorders 1 year prior to Screening
  • Patients at significant risk of suicide or of danger to themselves or others
  • Antipsychotics other than quetiapine or risperidone, or a change in dosing of these within 2 months of Screening
  • Treatment with mood stabilizers, antidepressants, or anxiolytics (short-acting hypnotics permitted)
  • Treatment within 1 month using cognition-affecting agents other than the above, as listed in Appendix 3 (e.g. CNS stimulants)
  • Use of other prohibited concomitant medications
  • Other concomitant medications that have been changed within 1 month prior to Screening
  • History within past 6 months of alcohol or illicit drug abuse
  • Use of smoking cessation therapy within 1 month prior to Screening
  • Tobacco users with no detectable urine cotinine level; and tobacco non-users with a detectable urine cotinine level
  • Unable to comply with study procedures in opinion of investigator, including CogState battery
  • History of significant other major or unstable neurological, metabolic, hepatic, renal, hematological, pulmonary, cardiovascular, gastrointestinal, or urological disorder
  • Myocardial infarction
  • Seizure disorder
  • Type 1 diabetes mellitus (DM); type 2 DM that requires medication (diet-controlled allowed, with HbA1C < 7.3)
  • Electroconvulsive therapy within 2 months prior to Screening
  • Uncontrolled hypothyroidism, vitamin B12 or folic acid deficiency
  • Current TB or known systemic infection (HBV, HCV, HIV)
  • Clinically significant finding on physical exam that could be a safety issue in the study
  • ALT or AST levels > 2.5 times the upper limits of the laboratory reference range
  • Clinically significant lab or ECG abnormality that could be a safety issue in the study, including QTcF > 450msec (males) or QtcF > 480msec (females)
  • Women of child-bearing potential and men unwilling or unable to use accepted methods of birth control
  • Women with a positive pregnancy test, or who are lactating
  • Participation in another clinical trial in last 3 months prior to Screening
  • Involvement in planning or conduct of the study by site staff

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01003379

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United States, California
Synergy Clinical Research Center
National City, California, United States, 91950-7628
Collaborative Neuroscience Network, Inc LA County
Torrance, California, United States, 90502
United States, Georgia
Altanta Center for Medical Research
Atlanta, Georgia, United States, 30308
United States, Kansas
Clinical Research Institute
Wichita, Kansas, United States, 67211
United States, New York
Neurobehavioral Reseach, Inc.
Cedarhurst, New York, United States, 11516
New York State Pshychiatric Institute, Columbia University
New York, New York, United States, 10032
United States, Texas
Community Clinical Research, Inc.
Austin, Texas, United States, 78754
Sravani Polyclinic and Mental Health Care Centre
Guntur, Andhra Pradesh, India, 522001
Asha Hospital
Hyderabaad, Andhra Pradesh, India, 500034
Dept. of Psychiatry, Owaisi Hospital & Research Centre
Hyderabaad, Andhra Pradesh, India, 500058
Brain Mind Behaviour Neuroscience Research Institute
Visakhapatnam, Andhra Pradesh, India, 530002
Government Hospital for Mental Care
Visakhapatnam, Andhra Pradesh, India, 530017
Adhit Khan Neuropsychiatric Centre
Mangalore, Karnataka, India, 575002
Dept. of Psychiatry, JSS University
Mysore, Karnataka, India, 57004
Mahendru Psychiatric Centre
Kanpur, Uttar Pradesh, India, 208005
Dept. of Psychiatry, CSM University
Lucknow, Uttar Pradesh, India, 226003
Sponsors and Collaborators
Targacept Inc.
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Principal Investigator: Jeffrey Lieberman, MD New York State Psychiatrii Institute, Columbia University
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Responsible Party: Targacept Inc.
ClinicalTrials.gov Identifier: NCT01003379    
Other Study ID Numbers: TC-5619-238-CRD-001
First Posted: October 28, 2009    Key Record Dates
Last Update Posted: September 13, 2013
Last Verified: December 2011
Keywords provided by Targacept Inc.:
cognitive dysfunction
Phase 2
Additional relevant MeSH terms:
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Cognitive Dysfunction
Schizophrenia Spectrum and Other Psychotic Disorders
Mental Disorders
Cognition Disorders
Neurocognitive Disorders