A Efficacy and Safety Study of Intramuscular Injection of Human Placenta-Derived Cells (PDA-002) in Subjects With Diabetic Peripheral Neuropathy

Subjects will undergo a Screening Period (up to 28 days in duration) to determine study
eligibility and baseline levels of signs and symptoms of diabetic peripheral neuropathy (DPN)
will be established. Subjects will then enter a Treatment Period (6 months in duration).
During the Treatment Period, subjects will be evaluated on an ongoing basis (at 8 scheduled
study visits). Subjects will receive intramuscular (IM) injections of investigational product
(IP) on Study Days 1, 29, and 57 as fifteen 0.30 mL injections (below the knee and above the
ankle) in one lower extremity in a blinded manner. After completing the Treatment Period,
subjects will enter the Follow-up Period where they will continue to be evaluated at
scheduled study visits over the subsequent months.

An analysis of all study data will occur after the last subject has completed Visit 9 (Month
6) and after the last scheduled study visit.

Inclusion Criteria: Subjects must satisfy the following criteria to be enrolled in the
study:

1. Males and females who are at least 18 years of age at the time of signing the informed
consent document.

2. Subject must understand and voluntarily sign an informed consent document prior to any
study related assessments/procedures are conducted.

3. Subject is willing and able to adhere to the study visit schedule and other protocol
requirements

4. Diabetes mellitus (DM) Type 2 as defined by the American Diabetes Association (ADA) or
World Health Organization (WHO) criteria.

5. Meet established criteria for diabetic peripheral neuropathy (DPN) due to Type 2
diabetes with the following:

1. Abnormal symptoms 6-item Neuropathy Total Symptom Score (NTSS-6 ≥ 6 points (total
score) or ≥ 2.0 points for one or more symptoms) AND

2. Abnormal signs; Utah Early Neuropathy Scale (UENS) score of 2-24 and/or
Neurological Impairment Score of the Lower Limb (NIS-LL) score of 2-10.

6. A female of childbearing potential must have a negative serum pregnancy test at
screening and a negative urine pregnancy test prior to treatment with study therapy.
In addition, sexually active Females of Child Bearing Potential (FCBP) must agree to
use 2 of the following adequate forms of contraception methods simultaneously such as:
oral, inject able, or implantable hormonal contraception, tubal ligation, intrauterine
device (IUD), barrier contraceptive with spermicide or vasectomized partner for the
duration of the study.

7. Males (including those who have had a vasectomy) must agree to use barrier
contraception (latex condoms) when engaging in sexual activity with FCBP for the
duration of the study

Exclusion Criteria: The presence of any of the following will exclude a subject from
enrollment:

1. Any significant medical condition, laboratory abnormality, or psychiatric illness that
would prevent the subject from participating in the study.

2. Other causes of neuropathy in diabetic subjects: chronic inflammatory demyelinating
polyneuropathy; neuropathy due to vitamin B12 deficiency, hypothyroidism, and uremia
syndrome; and neuropathy due to entrapment or trauma.

3. A reversible course of acute painful diabetic neuropathy syndrome: treatment-induced
diabetic neuropathy that presents in the setting of rapid glycemic control; diabetic
neuropathic cachexia; and diabetic anorexia, a diabetic neuropathy that is seen with
intentional weight loss.

4. History of a prior diagnosis of severe peripheral arterial disease (PAD).

5. Thrombocytopenia and coagulopathy, to avoid severe bruising or bleeding due to
multiple intramuscular (IM) injections.

6. Any condition including the presence of laboratory abnormalities that places the
subject at unacceptable risk if he or she were to participate in the study.

7. Any condition that confounds the ability to interpret data from the study.

8. Subjects who are taking opioids for the treatment of DPN.

9. Pregnant or lactating females.

10. Subjects with a body mass index > 40 kilgrams (kg)/m^2 at screening.

11. Neuropathy resulting from a condition other than DM and/or significant co-morbid
neurological diseases (eg, Parkinson's disease, epilepsy, multiple sclerosis,
alcoholic peripheral neuropathy), or exposure to agents suspected to cause symptoms of
neuropathy (such as but not limited to metronidazole, antituberculosis medications,
and heavy metals).

12. Advanced neuropathy as measured by the absence of sural sensory nerve action
potential, or a UENS>24 and or a NIS-LL>10.

13. History of a prior diagnosis of Critical Limb Ischemia.

14. History of diabetic foot ulceration (at any time) and/or or undergoing a limb
revascularization procedure(s) and/or amputation(s) due to diabetes mellitus (DM).

15. Diagnosis of Type 1 DM and/or any of the following: diagnosis of DM prior to age 35
years; insulin required to treat DM within 1 year after DM diagnosis; history of
diabetic ketoacidosis.

16. Aspartate Aminotransferase (AST), Alanine Aminotransferase (ALT), or alkaline
phosphatase ≥ 2.5 x the upper limit of normal (ULN) at screening.

17. Estimated glomerular filtration rate (eGFR) < 30 mL/min/1.73 m2 at Screening
calculated using the Modification of Diet in Renal Disease Study equation or history
of an abnormal eGFR < 60 and decline > 15 mL/min/1.73 m2 below normal in the past
year.

18. Bilirubin level > 2 mg/dL (unless subject has known Gilbert's disease) at screening.

19. Untreated chronic infection or treatment of any infection with systemic antibiotics
within 4 weeks prior to dosing with investigational product (IP).

20. Uncontrolled hypertension (defined as diastolic blood pressure > 100 mmHg or systolic
blood pressure > 180 mmHg during screening at 2 independent measurements taken while
subject is sitting and resting for at least 5 minutes).

21. History of significant cardiac disorders including but not limited to malignant
ventricular arrhythmia, CCS Class III-IV angina pectoris, myocardial infarction/
percutaneous coronary intervention (PCI) / coronary artery bypass graft (CABG) in the
6 months prior to signing the informed consent form (ICF), pending coronary
revascularization in the following 3 months, transient ischemic attack/cerebrovascular
accident in the 6 months prior to signing the informed consent form, and/or New York
Heart Association [NYHA] Stage III or IV congestive heart failure. Note: Stable
Canadian Cardiovascular Society (CCS) Class I-II angina is allowed.

22. Poorly controlled DM (hemoglobin A1c > 10%) at screening.

23. Untreated proliferative retinopathy at screening.

24. Life expectancy less than 2 years due to concomitant illnesses.25. History of
malignancy within 5 years except for the following circumstances: basal cell or
squamous cell carcinoma of the skin, remote history of cancer now considered cured or
positive Pap smear with subsequent negative follow-up.

26. History of hypersensitivity to any of the components of the product formulation
(including bovine or porcine products, dextran 40, and dimethyl sulfoxide [DMSO]).

27. Subject has received an investigational agent —an agent or device not approved by the
US Food and Drug Administration (FDA) for marketed use in any indication— within 90 days
(or 5 half-lives, whichever is longer) prior to treatment with study therapy or planned
participation in another therapeutic study prior to the completion of this study or has
received previous gene or cell therapy at any time.