T-Regulatory Cells in Amyotrophic Lateral Sclerosis

This Pilot Study will consist of 4 ALS subjects who will undergo 4 infusions of autologous
expanded Tregs with concomitant subcutaneous injections of IL-2 (2 x 105 IU/m2) 3 times
weekly for 52 weeks or at least until such time that interim analyses can confirm or negate
its benefit.

During the enrollment period up to four subjects will be recruited from patients known to our
clinic for screening, baseline measures and leukapheresis. The Treg cell manufacturing will
be performed in a GMP laboratory. The first subject will receive infusions of their expanded
Tregs (1x106 /kg) with concomitant subcutaneous IL-2 injections (2 x 105 IU/m2) 25 days (+/-
2 days) post leukapheresis. The 2nd subject will begin after the first subject has completed
the first 4 weeks and has experienced no untoward effects during this period. Once subjects
#1 and #2 have completed the first 4 weeks and no toxic events have occurred they will
therefore be considered safely past the first milestone and subject #3 will begin infusions.
After subject #3 has completed the first 4 weeks with no untoward effects, subject #4 may
begin infusions with the below modified schedule:

The 4th subject will undergo infusion of autologous expanded Tregs once every four weeks (+/-
2 days) for a total of four infusions, with concomitant subcutaneous injections of IL-2 (2 x
105 IU/m2) 3 times weekly. In addition, subject #4 will begin subcutaneous IL-2 injections 4
weeks before his first autologous Treg infusion. An additional office visit will take place 2
weeks after initiating IL-2 for clinical evaluation, scoring and blood draw. Office visits
will then be completed every two weeks while the subject is receiving Treg infusions for
clinical evaluation, scoring, and blood draws. Then, the subject will be seen in office
visits once per month for one year total for clinical evaluation, scoring, and blood draws.

In addition, subjects #1, 2 and 3 will repeat the leukapheresis (under a separate protocol)
and undergo Treg infusions at the modified schedule of every 4 weeks, with concomitant
subcutaneous injections of IL-2 (2 x 105 IU/m2) 3 times weekly. The subjects will be called
on Day 7, and 21. Office visits will be completed on the day after infusions and every two
weeks while the subjects are undergoing Treg infusions for clinical evaluation, scoring, and
blood draws. The subjects will then be seen during office visits once per month for one year
total from their initial baseline visit for clinical evaluation, scoring, and blood draws

Monthly interim analyses will monitor the subjects using validated ALS scales such as the
ALSFRS-R and Appel Scale, which incorporates muscle strength and dysfunction, activities of
daily living and pulmonary function. The analyses will also include interim medical history
and physical exam, EKG when indicated, safety labs (such as CBC, chemistry, liver function,
T4 and TSH) as well as more technical research labs such as T Regulatory Cell, Th1 and Th17
counts, FoxP3 RNA expression, and Treg Suppression Assays. A PT/PTT will be performed only if
the subject has an abnormal coagulation result at baseline or if the subject is on
anti-coagulation therapy.

Inclusion Criteria:

1. Age 18 years or older.

2. Sporadic or familial ALS diagnosed as possible, laboratory-supported probable,
probable, or definite as defined by revised El Escorial criteria (Appendix 1).

3. Subjects must not have taken riluzole for at least 30 days, or be on a stable dose of
riluzole for at least 30 days (riluzole-naïve subjects are permitted in the study).

4. Capable of providing informed consent and following trial procedures.

5. Geographically accessible to the site.

6. Women must not be able to become pregnant (e.g. post-menopausal, surgically sterile,
or using adequate birth control methods) for the duration of the study and three
months after study completion. Adequate contraception includes: abstinence, hormonal
contraception (oral contraception, implanted contraception, injected contraception or
other hormonal (patch or contraceptive ring, for example) contraception), intrauterine
device (IUD) in place for ≥ 3 months, barrier method in conjunction with spermicide,
or another adequate method.

7. Subjects must agree not to take live attenuated vaccines (including seasonal flu
vaccine) 30 days before blood collection.

8. Available autologous Tregs product with greater than or equal to 50% expression of
CD4, CD25 and FoxP3 determined by flow-cytometry.

9. Subjects must have been previously evaluated and followed clinically by a
neuromuscular specialist at Houston Methodist Neurological Institute

10. Normal Alanine aminotransferase level (ALT)

11. Normal Serum creatinine level

Exclusion Criteria:

1. Prior use of cells therapies

2. Concurrent use of other experimental ALS therapies

3. Pregnant or breastfeeding or planning to become pregnant or planning a partner's
pregnancy.

4. Other unstable medical or psychiatric illness

5. Known immune deficiency or history of lymphoma or leukemia

6. History of lymphopenia.

7. History of acquired or inherited immune deficiency syndrome, including leukopenia.

8. History of severe untreated chronic obstructive sleep apnea.

9. FVC less than 50% predicted at screening.

10. Exposure to any other agent currently under investigation for the treatment of
subjects with ALS (off-label use or investigational) within 30 days of the Baseline
Visit.

11. The presence of unstable psychiatric disease, cognitive impairment, or dementia that
would impair ability of the subject to provide informed consent, according to the PI's
judgment, or a history of active substance abuse within the prior year.

12. Clinically significant history of cardiac, oncologic, hepatic, or renal dysfunction,
or other medically significant illness.

13. The presence of any immunologic or autoimmune disease

14. Severe cardiac dysfunction defined clinically, or as a left ventricular ejection
fraction less than 40% of predicted or abnormal EKG findings.