Study of A-101 Topical Solution for the Treatment of Common Warts

A Phase 3 Randomized, Double-Blind, Vehicle-Controlled, Parallel Group Study of A-101 Topical
Solution Applied Twice a Week in Subjects with Common Warts

Inclusion Criteria:

1. Subject or legal guardian is able to comprehend and is willing to sign an informed
consent/assent for participation in this study.

2. Male or female ≥ 1 years old.

3. Subject has a clinical diagnosis of common warts (verruca vulgaris).

4. Subject has at least 1 and up to 6 clearly identifiable common warts located on the
trunk or extremities that meet the requirements as defined below:

1. Have a longest axis that is ≥3 and ≤8 mm and have a thickness of ≤3mm

2. Be a discrete lesion, i.e. each wart meeting the entry criteria is clearly
separated from other warts.

3. Be present for at least 4 weeks

4. Not be covered with hair which, in the investigator's opinion, would interfere
with the study medication treatment or the study evaluations

5. Not be in an intertriginous fold

6. Periungual, subungual, genital, anal, mosaic, plantar, flat and filiform warts
are excluded from treatment and evaluation. If a subject has these types of
warts, but also has warts that meet the inclusion criteria, the subject will NOT
be excluded from the study.

5. Each common wart identified for treatment must have a PWA ≥ 2.

6. Subject's chemistry and complete blood count results are within normal limits.

7. Subject is in good general health and free of any known disease state or physical
condition.

8. Subject is willing and able to follow all study instructions and to attend all study
visits.

9. Subject must be the only individual in a household participating in the study.

Exclusion Criteria:

1. Subject has clinically atypical warts.

2. Subject is immunocompromised (e.g., due to chemotherapy, systemic steroids, genetic
immunodeficiency, transplant status, etc.).

3. Subject has a history of Human Immunodeficiency Virus (HIV) infection.

4. Subject has had any Human Papilloma Virus (HPV) vaccine within 6 months prior to Visit
1.

5. Subject has used any of the following intralesional therapies within the specified
period prior to Visit 2:

- Immunotherapy (e.g., Candida antigen, mumps antigen, Trichophyton antigen); 8
weeks

- Anti-metabolite therapy (e.g., bleomycin, 5-fluorouracil); 8 weeks

6. Subject has used any of the following systemic therapies within the specified period
prior to Visit 2:

- Immunomodulatory/immunosuppressant therapy (e.g., etanercept, alefacept,
infliximab); 16 weeks

- Glucocorticosteroids (inhaled and intra-nasal steroids are permitted); 28 days

7. Subject has used any of the following topical therapies within the specified period
prior to Visit 2 on, or in the proximity to any of the common warts identified for
treatment, that in the investigator's opinion interferes with the study medication
treatment or the study assessments:

- LASER, light or other energy-based therapy (e.g., intense pulsed light [IPL],
photodynamic therapy [PDT]); 180 days

- Immunotherapy (e.g., imiquimod, squaric acid dibutyl ester[SADBE], etc.) 12 weeks

- Liquid nitrogen, electrodesiccation, curettage; 60 days

- Hydrogen peroxide; 90 days

- Antimetabolite therapy (e.g., 5-fluorouracil); 8 weeks

- Retinoids; 90 days

- Over-the-counter (OTC) wart therapies and cantharidin; 28 days

8. Subject currently has or has had any of the following within the specified period
prior to Visit 1 on or in the proximity to any of the common warts identified for
treatment that, in the investigator's opinion, interferes with the study medication
treatment or the study assessments:

- Cutaneous malignancy; 180 days

- Sunburn; currently

- Pre-malignancy (e.g., actinic keratosis); currently

9. Subject has a history of sensitivity to any of the ingredients in the study
medications.

10. Subject has any current skin or systemic disease (e.g., psoriasis, atopic dermatitis,
eczema, sun damage), or condition (e.g., sunburn, excessive hair, open wounds) that,
in the opinion of the investigator, might put the subject at undue risk by study
participation or interfere with the study conduct or evaluations.

11. Participation in another therapeutic investigational drug/device trial in which
administration of an investigational treatment occurred with 30 days prior to Visit 1.

12. Subject has an active malignancy.

13. Subjects is viewed by the Principal Investigator as not being able to complete the
study.