A Futility Trial of Sirolimus in Multiple System Atrophy

Inclusion Criteria:

- Participants aged 30-80 years old with a diagnosis of MSA based on clinical criteria
and standardized autonomic testing. This approach allows for identification of
patients with MSA with very high specificity and is yet sensitive enough to allow for
enrollment of patients at a disease stage at which an intervention on the natural
disease course has a meaningful impact on patient outcome. Patients therefore have to
fulfill current consensus criteria (1) for probable MSA of the parkinsonian subtype
(MSA-P) or cerebellar subtype (MSA-C) and have findings on autonomic function testing
suggestive of MSA.

- Participants who are less than 4 years from the time of documented MSA diagnosis.

- Participants who are still able to walk with or without assistance.

- Participants with an anticipated survival of at least 3 years in the opinion of the
investigator.

- Participants who are willing and able to give informed consent.

- Montreal Cognitive Asessment (MoCA) > 20.

- Ability to take oral medication and be willing to adhere to the study drug regimen

- For females of reproductive potential: use of highly effective contraception for at
least 1 month prior to screening and agreement to use such a method during study
participation and for an additional 8 weeks after the end of study drug administration

- For males of reproductive potential: use of condoms or other methods to ensure
effective contraception with partner

- Agreement to adhere to Lifestyle Considerations (see section 5.3) throughout study
duration

Exclusion Criteria:

- Women of childbearing potential who do not practice an acceptable method of birth
control. Acceptable methods of birth control in this study are: surgical
sterilization, intrauterine devices, partner's vasectomy, a double-protection method
(condom or diaphragm with spermicide), hormonal contraceptive drug (i.e., oral
contraceptive, contraceptive patch, long-acting injectable contraceptive) with a
required second mode of contraception.

- Participants with a clinically significant or unstable medical or surgical condition
that, in the opinion of the investigator, might preclude safe completion of the study
or might affect the results of the study. These include conditions causing significant
central nervous system (CNS) or autonomic dysfunction, including congestive heart
failure, recent (<6 months) myocardial infarct, cardiopulmonary disease, severe,
uncontrolled hypertension, thrombocytopenia (< 50 x 10(9)/L), severe anemia (< 8g/dl),
immunocompromised state, liver or kidney disease (creatinine > 1.5 mg/dl or
proteinuria > 20 mg/dl), uncontrolled diabetes mellitus (HbA1c >10g%), alcoholism,
amyloidosis, uncontrolled hypothyroidism, sympathectomy, unstable peripheral
neuropathies, concurrent infections, orthopedic problems that compromise mobility and
activity of daily living, cerebrovascular accidents, neurotoxin or neuroactive drug
exposure, parkinsonism due to drugs (including neuroleptics, alpha-methyldopa,
reserpine, metoclopramide).

- Participants with high LDL cholesterol levels (LDL > 160 mg/dL) and/or high
triglycerides levels (> 200 mg/dL).

- Participants with latent tuberculosis infection as defined as positive
interferon-gamma release-assay (QUANTIferon®).

- Participants with history of tuberculosis

- Participants with a history of active, acute or chronic, or latent hepatitis B or
hepatitis C.

- Participants with human immunodeficiency virus (HIV) infection, or other congenital or
acquired causes of immunosuppression.

- Participants with active malignant neoplasms or history of malignant neoplasm in the
last 5 years.

- Movement disorders other than MSA; e.g., Parkinson disease, dementia with Lewy bodies,
essential tremor, progressive supranuclear palsy, spinocerebellar ataxia, spastic
paraparesis, corticobasal degeneration, or vascular, pharmacological or
post-encephalitic parkinsonism.

- Dementia (DSM-V criteria).

- History of electroconvulsive therapy.

- History of deep brain stimulation surgery.

- Patients with contraindication for MRI scanning, including those with MRI-incompatible
pacemaker

- History of organ transplant

- Participants who have taken any investigational products within 60 days prior to
baseline.

- Treatment with cyclosporine, corticosteroids, methotrexate, rituximab within 3 months
prior to baseline.

- Treatment with inhibitors of CYP3A4 (which may decrease the metabolism of sirolimus
and increase sirolimus levels): nicardipine, verapamil, clotrimazole, fluconazole,
itraconazole, clarithromycin, erythromycin, troleandomycin, cisapride, metoclopramide,
bromocriptine, cimetidine, danazol, HIV-protease inhibitors (e.g., ritonavir,
indinavir); grapefruit.

- Treatment with inducers of CYP3A4 (which may increase the metabolism of sirolimus and
decrease sirolimus levels): carbamazepine, phenobarbital, phenytoin, rifabutin,
rifapentine.

- Inability or unwillingness of subject or legal guardian/representative to give written
informed consent.