Evaluation of the Safety and Efficacy Study of RGN-137 Topical Gel for Junctional and Dystrophic Epidermolysis Bullosa

RGN-137 will be evaluated for efficacy and safety compared to a Placebo. A matched-pair
design will be used to evaluate RGN-137 treatment versus placebo for treatment of 15 subjects
with JEB or DEB. Eligible subject must have 1 set of matched-pair wound. The investigator
will assign pair of index wounds, each wound with an area between 5cm2 and 50cm2, inclusive,
for the eligible subject on Day 1, and for each pair, one wound will be randomized to receive
RGN-137 gel and the other to receive Placebo gel. Subjects and independent evaluator will be
blinded to the treatment assignments for each wound.

Inclusion Criteria:

- Male or female and at least 4 years old with a diagnosis of DEB or JEB

- Patients and their parents or guardians must be willing and able to provide written
informed consent/assent

- Presence of 1 pair of stable index wounds within the specified size range at study

1. Index wounds must have a surface area between 5 cm2 and 50 cm2, inclusive at the
screening visit

2. The index wounds selected as pairing must be relatively matched in terms of size
and location

- Women of childbearing potential must have a negative pregnancy test prior to
randomization

- Sexually active subjects must agree to use medically accepted methods of contraception
during the study

Exclusion Criteria:

- Have any clinical evidence of local infection of the index lesion

- Use of prior or concomitant medication (Any investigational drug within 30 days,
Immunotherapy or cytotoxic chemotherapy within 60 days, Systemic steroidal therapy
within 30 days, and topical steroidal therapy within 14 days)

- History of sensitivity to any component of the treatment

- Neurological, cardiovascular, respiratory, hepatic, renal, or metabolic disease likely
to interfere with the subject's participation in or completion of the study (At the
discretion of investigator, participants with cardiomyopathy can participate)

- Current or former malignancy, including a history of squamous cell carcinomas

- Arterial or venous disorder resulting in ulcerated wounds

- Uncontrolled diabetes mellitus

- Pregnancy or breastfeeding during the study

- Girls or women who have had menarche but have not completed menopause

- Any condition or situation likely to cause the subject to be unable or unwilling to
participate in the study procedures