Clinical trial NCT00858689: Add-on Pilot Trial of Minocycline to Treat Fragile X Syndrome
Official title: Add-on Pilot Trial of Minocycline in Fragile X Syndrome
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Fragile X Syndrome
Keywords: Clinical Drug Trial
Lead sponsor: FRAXA Research Foundation
Sponsor class: OTHER
Collaborators: name: Fragile X Research Foundation of Canada
First posted: 2009-03-10
Enrollment: 20
Sex: ALL
Minimum age (years): 13
Maximum age (years): 35
Standard ages: CHILD
ADULT
Accepts healthy volunteers: yes
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: TREATMENT

Brief summary: Fragile X Syndrome (FXS) is the most common known inherited form of mental impairment, developmental disability and autism. Minocycline is an antibiotic that has recently been used to treat the mouse model for Fragile X, and was found to reverse the structural abnormalities that are seen their brain cells. The purpose of this research study is to determine if minocycline is an effective treatment for patients with fragile X syndrome (FXS).

Detailed description: Fragile X Syndrome (FXS) is the most common known inherited form of mental impairment and is also associated with a range of learning disabilities, neurological problems, such as seizures, and behavioural difficulties. For many individuals with FXS, behavioral difficulties result in severe problems within the family and community, particularly in the form of agitation, temper outbursts, hyperactivity, and aggression. These problems often require a variety of psychopharmacological and behavioural approaches. Although a variety of medications can be helpful in FXS there are no targeted interventions based on molecular abnormalities that have been studied. Defects in dendritic spine formation have been found in the brains of patients with Fragile X, suggesting these structures may represent an anatomical and physiological basis for the cognitive deficits associated with this disorder. Recent research has suggested that minocycline may have a specific benefit in the treatment of FXS. Minocycline is an antibiotic that has been found to inhibit the activity of matrix metallo-proteinase-9 (MMP-9), which is up-regulated in the hippocampus of FMR1 KO (Fragile X Mental Retardation-1 Knockout) mice and may be responsible for the immature dendritic spine profile of hippocampal neurons. Minocycline has recently been used to treat the FXS KO mouse model for Fragile X, and was found to rescue this abnormal phenotype by inducing the formation of mature dendritic spines in FMR1 KO hippocampal neurons, both in vitro and in vivo. Minocycline treated FXS KO mice also performed significantly better in the elevated maze, a cognitive performance test that measures activity and anxiety.

Exciting preclinical effects of minocycline with regard to the FXS disease model have led to this pilot proposal, which is designed to generate preliminary data that could be used to support a larger clinical trial.

The overall hypothesis is that minocycline is a specific molecular targeted treatment for FXS that will display beneficial effects on disruptive behaviour and possibly other associated features of FXS via a reduction in MMP-9 activity.

Eligibility criteria: Inclusion Criteria:

* Diagnosis of FXS by clinical evaluation and confirmed by FMR1-DNA testing with presence of full mutation or mosaicism for the full mutation. Prior DNA testing reports will be accepted, when available.
* Age between 13 to 35 years inclusive at the time of informed consent.
* Male or female
* CGI-Severity Score of 4 or greater, indicative of moderate or greater severity of behavioural problems. This is a 7-point scale of clinical global impression of severity that the clinician fills out after considering all the available information on the patient, including the parent history, the examination in clinic, reports from the school and other sources.
* Score of 9 or greater on the Aberrant Behaviour Checklist - Irritability Scale (top 50th %-tile). The ABC is a global behaviour checklist implemented for the measurement of drug and other treatment effects in mentally impaired individuals. It is made up of 5 empirically derived dimensions including irritability, lethargy/withdrawal, inappropriate speech, hyperactivity, and stereotypic behaviour based on 58 items that describe various behavioural problems.
* Availability of parent and/or caregiver for all clinic visits and assessments.
* English language fluency and reading level of 6th grade or greater in one caregiver.

Exclusion Criteria:

* Allergy to minocycline.
* Kidney disease or elevated renal function tests.
* Liver disease or elevated liver function tests.
* Participants with neutropenia, anemia, or thrombocytopenia.
* History of systemic lupus erythematosus or screening anti-nuclear antibody (ANA) titre of \>1:40, as minocycline may cause a lupus-like reaction.
* Individuals who do not have a mother or caregiver who is willing to participate in the clinic visits.
* Individuals who are pregnant or at risk to become pregnant, specifically sexually active females will be excluded.
* Presence of persistent psychotic symptoms
* Subjects with symptom severity likely judged to endanger personal safety or safety of others.
* History of systemic lupus erythematosus or screening anti-nuclear antibody (ANA) titre of \>1:40, as minocycline may cause a lupus-like reaction.

Primary outcomes:
measure: Change From Baseline of ABC Irritability Subtest Score at 8 Weeks
timeFrame: Baseline and 8 weeks
measure: ABC Irritability Subtest Score
timeFrame: 8 weeks
measure: ABC Irritability Subtest Score
timeFrame: 1 year
Secondary outcomes:
measure: Parent Defined Target Symptoms Scale-Visual
timeFrame: Baseline
measure: Clinical Global Impression Scale
timeFrame: Baseline
measure: Stanford Binet 5 (SB5)
timeFrame: Baseline
measure: The Peabody Picture Vocabulary Test Third Edition (PPVT-III)
timeFrame: Baseline
measure: The Repeatable Battery for the Assessment of Neuropsychological Status (RBANS)
timeFrame: Baseline
measure: Non-Verbal Associative Learning Task (NVALT)
timeFrame: Baseline
measure: Vineland Adaptive Behaviour Scales (VABS)
timeFrame: Baseline
measure: Parent Defined Target Symptoms Scale-Visual
timeFrame: 8 weeks
measure: Parent Defined Target Symptoms Scale-Visual
timeFrame: 1 year
measure: Clinical Global Impression Scale
timeFrame: 8 weeks
measure: Clinical Global Impression Scale
timeFrame: 1 year
measure: Stanford Binet 5 (SB5)
timeFrame: 1 year
measure: The Peabody Picture Vocabulary Test Third Edition (PPVT-III)
timeFrame: 8 weeks
measure: The Peabody Picture Vocabulary Test Third Edition (PPVT-III)
timeFrame: 1 year
measure: The Repeatable Battery for the Assessment of Neuropsychological Status (RBANS)
timeFrame: 8 weeks
measure: The Repeatable Battery for the Assessment of Neuropsychological Status (RBANS)
timeFrame: 1 year
measure: Non-Verbal Associative Learning Task (NVALT)
timeFrame: 8 weeks
measure: Non-Verbal Associative Learning Task (NVALT)
timeFrame: 1 year
measure: Vineland Adaptive Behaviour Scales (VABS)
timeFrame: 8 weeks
measure: Vineland Adaptive Behaviour Scales (VABS)
timeFrame: 1 year
Other outcomes:
Locations:
city: Toronto
country: Canada
facility: Surrey Place Centre
state: Ontario
Study officials:
affiliation: Fragile X Research Foundation of Canada
name: Carlo Paribello, M.D.
role: PRINCIPAL_INVESTIGATOR
References:
citation: Paribello C, Tao L, Folino A, Berry-Kravis E, Tranfaglia M, Ethell IM, Ethell DW. Open-label add-on treatment trial of minocycline in fragile X syndrome. BMC Neurol. 2010 Oct 11;10:91. doi: 10.1186/1471-2377-10-91.