Genetic Predictors of Lithium Response in Bipolar Disorder
Study Details
Study Description
Brief Summary
The purpose of this study is to identify genetic predictors of lithium response in bipolar disorder.
| Condition or Disease | Intervention/Treatment | Phase |
|---|---|---|
|
Detailed Description
The long term focus of this research program has been identification of genes for bipolar disorder. The investigators have recently obtained evidence from several lines of investigation to support the role of the gene for G protein receptor Kinase 3(GRK3) in bipolar disorder. Work to replicate and extend these results is continuing under NIH funding. In this clinical the investigators will extend the investigators' work into Pharmacogenetics to attempt to identify genes that are associated with medication response in bipolar disorder. Lithium is the first mood stabilizer medication and remains a mainstay of treatment. Many patients have an excellent response to lithium, tolerate it well, and are stabilized for years, while others do not. The reasons for this difference in response are unclear, but it is likely that genetic factors make a substantial contribution. The lack of good predictors of response frequently result in a time consuming trial and error clinical process to find the best medication. Such a trial and error process can take months with prolongation of patient suffering. Hence, there is a strong clinical need for predictors. The investigators have conducted a preliminary study with 92 lithium responders and 92 non-responders identified through retrospective detailed history and chart review. These subjects have been genotyped at 88 single nucleotide polymorphism (SNP) markers in 9 candidates genes relevant to lithium presumed mechanism of action for bipolar disorder. Four SNP markers in three genes showed nominally significant association to lithium response. One of the SNPs in the gene for neurotrophic receptor tyrosine kinase 2 (NTRK2), the receptor for brain-derived neurotrophic factor (BDNF), showed a strong association in patients who had predominantly euphoric a opposed to dysphoric mania (p=0.0005). Many data argue for the role of BDNF in the mechanism of antidepressants and mood stabilized action as well as susceptibility to bipolar disorder. No association was observed in those with dysphoric mania. This suggests that variations in this gene may operate in a clinically and genetically distinct subset of patients. It also argues for the importance of incorporating clinical subtypes into such analyses. These pilot results are preliminary but suggest the feasibility of such an approach. The investigators will conduct a prospective trial of lithium monotherapy in 100 patients with bipolar disorder. 200 patients who are unstable, mildly to moderately ill and not on lithium will be screened and then entered into 16-week stabilization phase where they will be treated and switched to lithium monotherapy. Patient stable on lithium will also be entered and other mediations withdrawn. After stabilization patients will be followed for one year or until a mood episode requires intervention. It is expected that 50% of patients will be stabilized and therefore 100 patients will enter the maintenance phase. Time to relapse and pharmacological intervention will be the primary outcome measure. This prospective sample will be used to replicate previous results at the NTRK2 and other genes. Analyses will be conducted to test for differences in survival curves between different genotypic group. Genomic control methods will be employed to detect or correct for possible stratification and heterogeneity. Clinical features of illness such as dysphoric mania, family history and rapid cycling will be employed as co-variates. Multivariate methods will also be employed in order to attempt to develop a multi-gene predictor of lithium response.
Study Design
Arms and Interventions
| Arm | Intervention/Treatment |
|---|---|
| Group 1 Veterans with bipolar disorder |
Drug: Lithium treatment
Lithium is a standard treatment for bipolar disorder. Patients will be stabilized on lithium monotherapy over a 3 month period, observed for one month, and then followed every 2 months in maintenance phase for 2 years
|
Outcome Measures
Primary Outcome Measures
- Time to Relapse [every 2 months for 2 years]
The primary outcome measure was time to relapse in months following stabilization on lithium.
Eligibility Criteria
Criteria
Inclusion Criteria:
-
Are 18 years of age or older;
-
Have a diagnosis of Bipolar Affective Disorder, I or II;
-
Have no contraindications, allergies, or previous adverse events or treatment failures with lithium;
-
Women who are not currently pregnant and are willing and able to use birth control;
-
Are clinically appropriate to treat with lithium.
Exclusion Criteria:
-
DSM-IV Axis I Diagnosis: other primary comorbid axis I disorders such as: schizophrenia, schizoaffective disorder, delusional disorder;
-
Alcohol or Substance Dependence: meets criteria for dependence within past 3 months;
-
Unstable Medial Conditions: Life threatening or unstable medical condition that require active adjustment of medications by medical history; or
-
Medical Conditions: concomitant medical condition that would preclude the use of lithium (i.e.: renal failure, head trauma with loss of consciousness, or clinically significant cardiac, renal, hepatic, neoplastic, or cardiovascular disease);
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Concomitant treatment with the following medications (during maintenance Phase): antipsychotics, antidepressants, antianxiety agent with the exception of benzodiazepines, to be used if needed for anxiety or insomnia, not to exceed 10 doses/week, or mood stabilizers with the exception of lithium; and
-
Active suicidal or homicidal ideations as elicited in the interviews.
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Stable and doing well on a mood stabilizer other than lithium.
Contacts and Locations
Locations
| Site | City | State | Country | Postal Code | |
|---|---|---|---|---|---|
| 1 | VA San Diego Healthcare System, San Diego, CA | San Diego | California | United States | 92161 |
Sponsors and Collaborators
- VA Office of Research and Development
Investigators
- Principal Investigator: John R Kelsoe, MD, VA San Diego Healthcare System, San Diego, CA
Study Documents (Full-Text)
None provided.More Information
Additional Information:
- NIMH-sponsored study of the genetics of bipolar disorder
- National Patient support group for bipolar disorder
Publications
None provided.- MHBA-023-05S
Study Results
Participant Flow
| Recruitment Details | Subjects with bipolar disorder were recruited through the San Diego VA Mood Clinic |
|---|---|
| Pre-assignment Detail |
| Arm/Group Title | Bipolar Disorder |
|---|---|
| Arm/Group Description | Veterans with bipolar disorder Lithium treatment: Lithium is a standard treatment for bipolar disorder. Patients will be stabilized on lithium monotherapy over a 3 month period, observed for one month, and then followed every 2 months in maintenance phase for 2 years |
| Period Title: Overall Study | |
| STARTED | 130 |
| COMPLETED | 110 |
| NOT COMPLETED | 20 |
Baseline Characteristics
| Arm/Group Title | Bipolar Disorder |
|---|---|
| Arm/Group Description | Veterans with bipolar disorder Lithium treatment: Lithium is a standard treatment for bipolar disorder. Patients will be stabilized on lithium monotherapy over a 3 month period, observed for one month, and then followed every 2 months in maintenance phase for 2 years |
| Overall Participants | 130 |
| Age (Count of Participants) | |
| <=18 years |
0
0%
|
| Between 18 and 65 years |
101
77.7%
|
| >=65 years |
29
22.3%
|
| Age (years) [Mean (Standard Deviation) ] | |
| Mean (Standard Deviation) [years] |
45.9
(11.38)
|
| Sex: Female, Male (Count of Participants) | |
| Female |
14
10.8%
|
| Male |
116
89.2%
|
| Race (NIH/OMB) (Count of Participants) | |
| American Indian or Alaska Native |
0
0%
|
| Asian |
8
6.2%
|
| Native Hawaiian or Other Pacific Islander |
0
0%
|
| Black or African American |
12
9.2%
|
| White |
108
83.1%
|
| More than one race |
2
1.5%
|
| Unknown or Not Reported |
0
0%
|
| Region of Enrollment (Count of Participants) | |
| United States |
130
100%
|
Outcome Measures
| Title | Time to Relapse |
|---|---|
| Description | The primary outcome measure was time to relapse in months following stabilization on lithium. |
| Time Frame | every 2 months for 2 years |
Outcome Measure Data
| Analysis Population Description |
|---|
| outpatients at VA San Diego Healthcare System |
| Arm/Group Title | Bipolar Disorder |
|---|---|
| Arm/Group Description | Veterans with bipolar disorder Lithium treatment: Lithium is a standard treatment for bipolar disorder. Patients will be stabilized on lithium monotherapy over a 3 month period, observed for one month, and then followed every 2 months in maintenance phase for 2 years |
| Measure Participants | 130 |
| Mean (95% Confidence Interval) [months] |
24.6
|
Adverse Events
| Time Frame | 10 years | |
|---|---|---|
| Adverse Event Reporting Description | The study is ended. | |
| Arm/Group Title | Bipolar Disorder | |
| Arm/Group Description | Subjects with Bipolar Disorder who are treated with lithium | |
All Cause Mortality |
||
| Bipolar Disorder | ||
| Affected / at Risk (%) | # Events | |
| Total | 0/130 (0%) | |
Serious Adverse Events |
||
| Bipolar Disorder | ||
| Affected / at Risk (%) | # Events | |
| Total | 0/130 (0%) | |
Other (Not Including Serious) Adverse Events |
||
| Bipolar Disorder | ||
| Affected / at Risk (%) | # Events | |
| Total | 16/130 (12.3%) | |
| Metabolism and nutrition disorders | ||
| weight gain | 16/130 (12.3%) | 16 |
Limitations/Caveats
More Information
Certain Agreements
All Principal Investigators ARE employed by the organization sponsoring the study.
There is NOT an agreement between Principal Investigators and the Sponsor (or its agents) that restricts the PI's rights to discuss or publish trial results after the trial is completed.
Results Point of Contact
| Name/Title | John Kelsoe |
|---|---|
| Organization | VA San Diego Healthcare System |
| Phone | 858-552-8585 ext 5704 |
| john.kelsoe@va.gov |
- MHBA-023-05S