Study to Evaluate the Safety and Efficacy of CHAM* for the Treatment of Diabetic Foot Ulcers

Inclusion Criteria:

1. Between 18 years and 80 years of age inclusive, as of the date of screening

2. Confirmed diagnosis of Type I or Type II Diabetes

3. An Index Ulcer defined as chronic (presence of wound for > 4 weeks), but not present
for more than 52 weeks at the Screening Visit

4. Index Ulcer is located below the malleoli on the plantar or dorsal surface of the foot

5. The Index Ulcer is between 1 cm2 and 15 cm2, inclusive, at the Screening Visit

6. The Index Ulcer extends into the dermis or subcutaneous tissue without evidence of
exposed muscle, tendon, bone, or joint capsule

7. Wound is free of necrotic debris

8. Patient has adequate circulation to the foot as documented by either:

- Ankle Brachial Index (ABI) > 0.70 and < 1.30, or

- In patients with non-compressible ankle vessels defined as an ABI ≥ 1.30, a Toe
Brachial Index (TBI) ≥ 0.50, or

- In patients with non-compressible ankle vessels defined as an ABI ≥ 1.30 and TBI
cannot be performed (e.g., toe is absent, wounds are present, or site cannot
perform a TBI), a Doppler waveform in the posterior tibial or dorsalis pedis
arteries at the ankle consistent with adequate flow in the foot (biphasic or
triphasic) and other diagnostic confirmation of adequate flow (e.g., duplex
imaging, normal pulse volume recording [PVR] testing).

Exclusion Criteria:

1. Index Ulcer is of non-diabetic pathophysiology

2. Gangrene is present on any part of the affected foot

3. Index Ulcer is over an active Charcot deformity

4. The longest dimension of the Index Ulcer exceeds 5 cm at the Baseline Visit

5. Patient is currently receiving dialysis or planning to go on dialysis

6. Patient has had 2 or more previous disease-related amputations of the lower
extremities

7. Patient has a glycated hemoglobin A1c (HbA1c) level of >10%

8. Chronic oral steroid use >7.5 mg daily for longer than 3 months at the time of
screening

9. Patient is receiving IV corticosteroids, immunosuppressive or cytotoxic agents at the
time of screening

10. Requiring intravenous (IV) antibiotics to treat the index wound infection at the time
of screening

11. Patient has an ulcer within 5 cm of the Index Ulcer identified for study consideration

12. Patient is Human Immunodeficiency Virus (HIV) positive or has Acquired Immune
Deficiency Syndrome (AIDS)

13. Current evidence of cellulitis, or other evidence of infection including fever or pus
drainage from the wound site

14. Current evidence of osteomyelitis or history of osteomyelitis within 30 days of
screening

15. Patient has active malignancy other than non-melanoma skin cancer

16. Patient's Index Ulcer has decreased by ≥20% during 1-week screening period

17. Patient's random blood sugar is >350 mg/dl at screening

18. Patient has untreated alcohol or substance abuse at the time of screening

19. Pregnant women and women who are breastfeeding

20. Patient is currently enrolled or participated in another investigational device, drug,
or biological trial within 30 days of screening

21. Patient has had within the last 30 days, or is currently undergoing, or is planning
for wound treatments with growth factors, living skin, dermal substitutes or other
advanced biological therapies

22. Patient is an employee, or an immediate family member of an employee, of the sponsor
company or site research staff conducting the study

23. Patients who have already been randomized in Protocol 303 at any center may not be
considered for screening or for re-entry into the trial at any center, even after the
end of their follow-up period

24. Patients with a history of poor compliance, or an unwillingness or inability to adhere
to the requirements of the protocol.