A Clinical Trial of Dantrolene Sodium in Pediatric and Adult Patients With Wolfram Syndrome

Inclusion Criteria:

Patients must meet all of the following criteria to be eligible for enrolment:

1. The patient has a definitive diagnosis of Wolfram syndrome, as determined by the
following:

a. Documented functionally relevant recessive mutations on both alleles of the WFS1
gene or dominant mutation on one allele of the WFS1 gene based on historical test
results (if available) or from a qualified laboratory at screening.

2. The patient is at least 5 years of age (biological age) at the time of written
informed consent.

3. The patient, patient's parent(s), or legally authorized guardian(s) must have
voluntarily signed an Institutional Review Board/Independent Ethics Committee-approved
informed consent form after all relevant aspects of the study have been explained and
discussed with the patient. The guardians' consent and patient's assent, as relevant,
must be obtained.

Exclusion Criteria:

Patients who meet any of the following criteria are not eligible for this study:

1. The patient has clinically significant non-Wolfram related CNS involvement which is
judged by the investigator to be likely to interfere with the accurate administration
and interpretation of protocol assessments.

2. The patient has a known defect in oxidative phosphorylation (such as a confirmed
mitochondrial myopathy)

3. The patient has abnormal liver function (defined as serum transaminases more than
twice the upper limit of normal for the reference laboratory)

4. The patient has a significant medical or psychiatric co-morbidity that might affect
study data or confound the integrity of study results.

5. The patient has received treatment with any investigational drug within the 30 days
prior to study entry.

6. The patient has received blood product transfusions within 90 days prior to screening.

7. The patient is unable to comply with the protocol, (e.g. has a clinically relevant
medical condition making implementation of the protocol difficult, unstable social
situation, known clinically significant psychiatric/behavioural instability, is unable
to return for safety evaluations, or is otherwise unlikely to complete the study), as
determined by the Investigator.

8. The patient has a known history of central apnea and/or ventilation requirements.

9. The patient has a known history of chronic obstructive pulmonary disease, pleural
effusion, and/or myocardial disease.