Combined Therapy With Narrow-Band Ultraviolet B Phototherapy and Apremilast for the Treatment of Vitiligo

Inclusion Criteria:

- Males or females, ≥ 18 years of age at the time of signing the informed consent
document.

- Must be in general good health (except vitiligo) as judged by the Investigator, based
on medical history, physical examination, clinical laboratories, and urinalysis.
(NOTE: The definition of good health means a subject does not have uncontrolled
significant co-morbid conditions).

- Understand and voluntarily sign an informed consent document prior to any study
related assessments/procedures being conducted.

- Able to adhere to the study visit schedule and other protocol requirements.

- Subjects must be clinically diagnosed by the investigator to have at least 20% body
surface area involvement of generalized type vitiligo.

- Fitzpatrick skin phototypes IV, V, and VI.

- Must meet the following laboratory criteria

1. White blood cell count ≥ 3000/mm3 (≥ 3.0 x 109/L) and < 14,000/mm3 (< 14 x
109/L).

2. Platelet count ≥ 100,000/μL (≥ 100 x 109/L).

3. Serum creatinine ≤ 1.5 mg/dL (≤ 132.6 μmol/L).

4. AST (SGOT) and ALT (SGPT) ≤ 2 x upper limit of normal (ULN). If the initial test
shows ALT or AST > 2 times the ULN, one repeat test is allowed during the
Screening Phase.

5. Total bilirubin ≤ 2 mg/dL (34 μmol/L). If the initial test shows total bilirubin
> 2 mg/dL (34 μmol/L), one repeat test is allowed during the Screening Phase.

6. Hemoglobin ≥ 10 g/dL (≥ 6.2 mmol/L).

- Females of childbearing potential (FCBP) must have a negative pregnancy test at
Screening and Baseline. While on investigational product and for at least 28 days
after taking the last dose of investigational product, FCBP who engage in activity in
which conception is possible must use one of the approved contraceptive options
described below:

Option 1: Any one of the following highly effective methods: hormonal contraception (oral,
injection, implant, transdermal patch, vaginal ring); intrauterine device (IUD); tubal
ligation; or partner's vasectomy; or

Option 2: Male or female condom (latex condom or nonlatex condom NOT made out of natural
[animal] membrane [for example, polyurethane]); PLUS one additional barrier method: (a)
diaphragm with spermicide; (b) cervical cap with spermicide; or (c) contraceptive sponge
with spermicide.

The female subject's chosen form of contraception must be effective by the time the female
subject is randomized into the study (for example, hormonal contraception should be
initiated at least 28 days before randomization).

- Male subjects (including those who have had a vasectomy) who engage in activity in
which conception is possible must use barrier contraception (male latex condom or
nonlatex condom NOT made out of natural [animal] membrane [for example, polyurethane])
while on investigational product and for at least 28 days after the last dose of
investigational product.

Exclusion Criteria:

- Clinically significant (as determined by the investigator) cardiac, endocrine,
pulmonary, neurologic, psychiatric, hepatic, renal, hematologic, or immunologic
disease, or other major uncontrolled diseases that will affect the health of the
subject during the study or interfere with the interpretation of study results.

- Hepatitis B surface antigen positive at Screening (Visit 1).

- Hepatitis C antibody positive at Screening (Visit 1).

- History of positive human immunodeficiency virus (HIV), or congenital or acquired
immunodeficiency (eg, Common Variable Immunodeficiency [CVID]). Active TB or a history
of inadequately treated TB.

- Active substance abuse or a history of substance abuse within six months prior to
Screening.

- Pregnant or breast feeding.

- History of allergy to any component of the IP.

- Major surgery within eight weeks prior to Screening (Visit 1) and/or planned surgery
during the length of the study.

- Malignancy or history of malignancy, except for:

1. treated (ie, cured) basal cell or squamous cell in situ skin carcinomas;

2. treated (ie, cured) cervical intraepithelial neoplasia (CIN) or carcinoma in situ
of the cervix with no evidence of recurrence within 5 years prior to Screening
(Visit 1).

- Unstable asthma (eg, acute episodes of exacerbation [nocturnal episodes, sudden
episodes triggered by unidentifiable factors] despite a stable regimen of
anti-asthmatic medications); prior episode(s) of life-threatening asthma; or asthma
that requires inhaled budesonide or equivalent at >1200 μg/day or fluticasone
propionate at > 880 μg/day along with another anti-asthmatic drug such as a
long-acting beta-agonist.

- A history of and/or concurrent condition of serious hypersensitivity (eg, anaphylaxis)
to drugs, foods, or other allergens without access to emergency rescue medication such
as epinephrine.

- Persistent or recurring bacterial infection requiring systemic antibiotics, or
clinically significant viral or fungal infections, within two weeks of Screening
(Visit 1). Any treatment for such infections must have been completed at least two
weeks prior to the Screening Visit and no new/recurrent infections should have
occurred prior to the Baseline Visit.

- Active skin infection requiring systemic antimicrobials at Baseline/Randomization
(Visit 2).

- Skin lesion(s) due to conditions other than vitiligo that would interfere with the
study specified assessments.

- Prior treatment with apremilast, or participation in a clinical study involving
apremilast.

- Use of phototherapy (ie, UVB, UVA) or systemic immunosuppressive drugs (including, but
not limited to, cyclosporine, corticosteroids, mycophenolate mofetil, azathioprine,
Methotrexate, or tacrolimus), or oral preparations of herbal immunomodulatory
medications within four weeks prior to Baseline/Randomization (Visit 2).

- Use of interferon-γ within 12 weeks prior to Baseline/Randomization (Visit 2).

- Use of abatacept, adalimumab, certolizumab pegol, etanercept, golimumab, infliximab,
or tocilizumab within 12 weeks prior to Baseline/Randomization (Visit 2).

- Use of oral janus kinase (JAK) inhibitors (e.g. tofacitinib, ruxolitinib) within 12
weeks prior to Baseline/Randomization (Visit 2).

- Use of omalizumab, rituximab, ustekinumab, alefacept, briakinumab, or other
therapeutic antibody products within 24 weeks prior to Baseline/Randomization (Visit
2).

- Use of any investigational drug within four weeks or five PK or PD half lives
(whichever is longer) prior to Baseline/Randomization (Visit 2).

- Use of topical corticosteroid preparations, topical calcineurin inhibitors, or other
topical preparations with immunomodulatory properties within 2 weeks prior to
Baseline/Randomization (Visit 2).

- Prior history of suicide attempt at any time in the subject's lifetime prior to
Baseline (Visit 2) or major psychiatric illness requiring hospitalization within 3
years prior to Baseline (Visit 2).

- Prolonged sun exposure or use of tanning booths, which may confound the ability to
interpret data from the study.

- Subjects whose vitiligo has not responded to at least 6 months of treatment with
NB-UVB.

- Subjects with segmental or localized vitiligo.

- Subjects with a history of therapeutic attempts at depigmentation.

- Fitzpatrick skin phototypes I, II, and III

- Subjects with history of photosensitivity ⁄ photo exaggerated dermatoses