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Protocol Details

ASPIRO: A Phase 1/2/3, Randomized, Open-Label, Ascending-Dose, Delayed-Treatment Concurrent Control Clinical Study to Evaluate the Safety and Efficacy of AT132, an AAV8-Delivered Gene Therapy in X-Linked Myotubular Myopathy (XLMTM) Patients

This study is NOT currently recruiting participants.

Summary | Eligibility | Citations | Contacts




Sponsoring Institute

National Institute of Neurological Disorders and Stroke (NINDS)

Recruitment Detail

Type: No longer recruiting/follow-up only
Gender: Male
Min Age: 3 Years
Max Age: 5 Years

Referral Letter Required


Population Exclusion(s)




Recruitment Keyword(s)



Muscle Myopathies;
Muscular Disease

Investigational Drug(s)


Investigational Device(s)



Genetic: AT132

Supporting Site

National Institute of Neurological Disorders and Stroke


X-Linked Myotubular Myopathy (XLMTM) is caused by a mutation in the MTM1 gene, which helps the body make the protein myotubularin. This causes severe muscle weakness in children. AT132 therapy gives the normal MTM1 gene to a child with XLMTM. This could help XLMTM symptoms.


To see if AT132 is safe, increases myotubularin production, and helps symptoms in children with XLMTM.


Boys under age 5 who:

Have XLMTM and a MTM1 mutation

Require mechanical breathing support


Participants will be screened with:

Physical exam

Blood, urine, and heart tests

Abdomen ultrasound

Medical history

Participants will join either the early treatment or delayed treatment group.

Participants will be admitted to the hospital. The next day they will get AT132 by IV infusion. They will stay in the hospital 1 or 2 nights. Two days after the infusion they will have the screening procedures, plus:

Performing simple tasks while being videotaped

Breathing tests: Participants will wear a facemask, breathing tube, or ventilator. Their airflow will be temporarily blocked.

Muscle biopsy. A small piece of muscle is taken from the participant s arm or leg under general anesthesia.

Wrist X-ray

Starting the day before their infusion, participants will take the drug prednisolone for 16 weeks.

Participants will have many visits over several years in this order:

Weekly for 2 months after the infusion

1 month later

Every 3 months for 1 year

Every 6 months for 5 years

Delayed treatment group participants will have visits 1 and 3 months after screening, then every 3 months for up to 1 year before receiving AT132.

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Subjects must meet all of the following inclusion criteria to be eligible for participation in this study.

1. Subject has a diagnosis of XLMTM resulting from a genetically confirmed mutation in the MTM1 gene as assessed by a Sponsor-approved testing facility.

2. Subject is male.

3. Subject is aged less than 5 years old at Day 1 and/or participated in the ATX-MTM- 009 (INCEPTUS) study.

4. Subject requires some mechanical ventilatory support:

--Part 1: Subject requires some mechanical ventilatory support (e.g., ranging from 24 hours per day full time mechanical ventilation, to noninvasive support such as continuous positive airway pressure (CPAP) or bilevel positive airway pressure (BiPAP) during sleeping hours).

--Part 2: Subject requires invasive mechanical ventilatory support ranging from 20 - 24 hours per day at screening (confirmed by daytime polysomnographic study).

5. Subject requiring invasive mechanical ventilator support is fitted with or willing to be fitted with a cuffed tracheostomy tube for some respiratory assessments.

6. Subject has ventilator maximum positive end-expiratory pressure (PEEP) less than 8 cm H2O at screening.

7. Signed informed consent by the parent(s) or legally authorized representative(s) (LAR) (when applicable).

8. Subject and parent(s)/LAR(s) are willing and able to comply with study visits and study procedures.


Subjects who meet any of the following exclusion criteria are not to be enrolled in this study.

1. Subject is participating in an interventional study designed to treatXLMTM.

2. Subject born less than 35 weeks gestation who is still not term as per correctedage.

3. Subject tests positive for AAV8 neutralizing antibody with titers greater than 1:20 (subjects under the age of 18 months may be retested in cases where antibodies may have been maternally acquired and titers may decline in the first months of life).

4. Subject had recent surgery (less than 3 months before Day 1) or has planned surgery that may confound data collection during the first 48 weeks of the study.

5. Subject has a clinically important condition, or life threatening disease other than XLMTM, in the opinion of the investigator.

6. Subject has a clinically significant underlying liver disease, defined as:

-- greater than or equal to Grade 3 Aspartate aminotransferase (greater than 5.0 x upper limit of normal [ULN]) [CTCAE v. 4.03]

-- greater than or equal to Grade 3 Alanine aminotransferase (greater than 5.0 x ULN) [CTCAE v. 4.03]

-Hepatic peliosis or any other clinically significant structural abnormality detected by ultrasound

7. Subject is currently experiencing a clinically important respiratory infection or other active infection at the time of screening.

8. Subject has received pyridostigmine or any medication to treat XLMTM within 3 months before Day 1.

9. Other than as required per protocol, subject has received immune-modulating agents within 3 months before Day 1 (use of inhaled corticosteroids to manage chronic respiratory conditions is allowed); use of other concomitant medications to manage chronic conditions must have been stable for at least 4 weeks before dosing.

10. Subject has a contraindication to prednisolone

11. Subject has a contraindication to study drug or ingredients

12. Subject has previous scoliosis repair surgery/procedure, or planned/expected scoliosis repair surgery/procedure, in the 12 months following Day 1 (Part 2 only).

13. Subject has contractures, scoliosis, or other medical condition that would limit the potential to achieve unassisted sitting, in the opinion of the investigator (Part 2 only).

14. Subject is able to sit without assistance for at least 30 seconds at screening, in the opinion of the investigator (Part 2 only).

15. Subject has a clinically important condition, including Common Terminology Criteria for Adverse Events (CTCAE) v4.03 Grade greater than or equal to 2 anemia (< 10g/dL hemoglobin)

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Not Provided

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Principal Investigator

Referral Contact

For more information:

Carsten G. Bonnemann, M.D.
National Institute of Neurological Disorders and Stroke (NINDS)
NIHBC 35 - PNRC I BG RM 2A-116
(301) 594-5496

A. Reghan Foley, M.D.
National Institute of Neurological Disorders and Stroke (NINDS)
BG 10 RM 2B39B
(301) 402-2273

Office of Patient Recruitment
National Institutes of Health Clinical Center (CC)
Building 61, 10 Cloister Court
Bethesda, Maryland 20892
Toll Free: 1-800-411-1222
Local Phone: 301-451-4383
TTY: TTY Users Dial 7-1-1

Clinical Trials Number:


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