VGX-3100 and Electroporation in Treating Patients With HIV-Positive High-Grade Anal Lesions

PRIMARY OBJECTIVES:

I. To determine the proportion of participants with HPV-16 and/or HPV-18-positive anal high
grade squamous intraepithelial neoplasia (HSIL) that achieve either complete or partial
response (which is defined as histopathological regression from HSIL to low grade squamous
intraepithelial neoplasia [LSIL] or normal) at 48 weeks after the first dose of VGX-3100
(VGX-3100).

SECONDARY OBJECTIVES:

I. To determine the safety and tolerability as assessed by Common Terminology Criteria for
Adverse Events version 5 (CTCAE v5.0).

II. To determine the proportion of participants with HPV-16 and/or HPV-18-positive anal HSIL
that achieve complete response (which is defined as histopathological regression from HSIL to
normal) at 48 weeks after the first dose of VGX-3100.

III. To determine the proportion of participants who clear HPV-16 and/or HPV-18 (defined as
changing from presence to absence of HPV-16 or 18 by anal histological specimen) at 48 weeks
after the first dose of VGX-3100.

IV. To determine proportion of participants who clear HPV-16 and/or HPV-18 (defined as
changing from presence to absence of HPV-16 and/or 18 by anal swab) at 48 weeks after the
first dose of VGX-3100.

V. To compare the proportion of participants with HPV-16 and/or HPV-18-positive anal HSIL who
achieve either complete or partial response (which is defined as histopathological regression
from HSIL to LSIL or normal) versus those who do not at 72 weeks after the first dose of
VGX-3100.

TERTIARY OBJECTIVES:

I. To determine the proportion of non-HPV-16 or HPV-18-positive anal HSIL lesions that
achieve either complete or partial response (which is defined as histopathological regression
from HSIL to LSIL or normal) at 48 weeks after the first dose of VGX-3100.

II. To determine the T cell response to VGX-3100 as measured by interferon-gamma (IFN-gamma)
enzyme-linked immunosorbent spot (ELISpot), flow cytometric assessments, and T cell
infiltration into anal mucosal tissue.

III. To determine the antibody response to VGX-3100 as measured by enzyme-linked
immunosorbent assay (ELISA) against HPV-16 E7 and HPV-18 E7 target antigens.

IV. To determine the association of the addition of a fourth dose of VGX-3100 with T-cell and
antibody responses.

V. To determine the association of VGX-3100 immune response with CD4+ lymphocyte count over
time.

VI. To determine the association of VGX-3100 immune response with HIV-1 ribonucleic acid
(RNA) over time.

VII. To determine if CD4 + lymphocyte count affects the overall or complete response rate at
48 weeks after the first dose of VGX-3100.

VIII. To assess the effect of tissue PD-L1 (programmed death ligand 1) expression and T-cell
infiltration on clinical benefit.

OUTLINE:

Patients receive HPV DNA plasmids therapeutic vaccine VGX-3100 intramuscularly (IM) and then
undergo electroporation over 10 seconds for 4 doses in week 0, 4, 12, and 24 in the absence
of disease progression or unacceptable toxicity.

After completion of study treatment, patients are followed up for up to 72 weeks.

Inclusion Criteria:

- Biopsy-proven anal HSIL at baseline (anal intraepithelial neoplasia [AIN]2 with a
positive p16 stain, AIN2-3, or AIN3)

- At least one focus of HSIL must be large enough to be monitored for response, i.e.,
not completely removed after the screening biopsy

- Must be positive for HPV-16 or -18 on genotyping performed on screening anal swab

- HIV positive; documentation of HIV-1 infection by means of any one of the following:

- Documentation of HIV diagnosis in the medical record by a licensed health care
provider

- Any licensed HIV screening antibody and/or HIV antibody/antigen combination assay
confirmed by a second licensed HIV assay such as a HIV-1 Western blot
confirmation or HIV rapid multispot antibody differentiation assay; NOTE: A
?licensed? assay refers to a U.S. Food and Drug Administration (FDA)-approved
assay, which is required for all investigational new drug (IND) studies

- Must be documented to be on an effective combination antiretroviral therapy (ART)
regimen, generally a 3-drug regimen based on Department of Health and Human Services
(DHHS) treatment guidelines by a licensed health care provider; documentation may be a
record of an ART prescription in the participant?s medical record, a written
prescription in the name of the participant for ART, or pill bottles for ART with a
label showing the participant?s name; each component agent of a multi-class
combination ART regimen will be counted toward the 3-drug requirement

- Eastern Cooperative Oncology Group (ECOG) performance status =< 1 (Karnofsky >= 70%)

- Life expectancy of greater than 5 years

- Within 90 days before enrollment: Leukocytes: >= 3,000/mm^3

- Within 90 days before enrollment: Absolute neutrophil count: >= 1,500/mm^3

- Within 90 days before enrollment: Platelets: >= 100,000/mm^3

- Within 90 days before enrollment: CD4 count >= 350 cells/mm^3

- Within 90 days before enrollment: HIV plasma HIV-1 RNA below detected limit obtained
by Food and Drug Administration (FDA)-approved assays (limit of detection: 75
copies/mL or less)

- For females, must have cervical cytology and visual examination of the vulva, vagina,
and cervix within 12 months prior to enrollment with confirmation of no evidence of
carcinoma; for women who underwent hysterectomy with removal of the cervix, cytology
from the vagina within 12 months is required

- For women of child-bearing potential (WOCBP), they must have a negative serum or urine
pregnancy test within 72 hours of receiving the first dose of VGX-3100 and be at least
3 months post-partum; WOCBP and men must agree to use adequate contraception (oral
contraceptive pills, intrauterine device, Nexplanon, Depo-Provera, or permanent
sterilization, etc., or another acceptable method as determined by the investigator)
prior to study entry, for the duration of study participation, and 4 months after
completion of VGX-3100 administration; should a woman become pregnant or suspect she
is pregnant while she or her partner is participating in this study, she should inform
her treating physician immediately

- A WOCBP is a sexually mature woman who: 1) has not undergone a hysterectomy or
bilateral oophorectomy; or 2) has not been naturally postmenopausal for at least
24 consecutive months (i.e., has had menses at any time in the preceding 24
consecutive months)

- Men who could father a child must agree to use at least one form of birth control
during or continued abstinence from heterosexual intercourse prior to the study, for
the duration of study participation, and 4 months after completion of VGX-3100
administration

- Ability to understand and the willingness to sign a written informed consent document

Exclusion Criteria:

- Inability to provide informed consent

- Patients who are receiving any other chronic (defined as more than 50% of the time in
the last 6 months) investigational agents within the 4 weeks before enrollment, other
than investigational antiretroviral agents for HIV and investigational agents for
hepatitis C

- Participants should be excluded if they have a condition requiring systemic treatment
with either corticosteroids (> 10 mg daily prednisone equivalents) or other
immunosuppressive medications within 2 weeks of study drug administration; inhaled
steroids and adrenal replacement doses =< 10 mg daily prednisone equivalents are
permitted in the absence of active autoimmune disease; participants are permitted to
use ocular, intra-articular, intranasal, and inhalational corticosteroids (with
minimal systemic absorption); physiologic replacement doses of systemic
corticosteroids are permitted, even if >= 10 mg/day prednisone equivalents; a brief
course of corticosteroids for prophylaxis (e.g., contrast dye allergy) or for
treatment of non-autoimmune conditions (e.g., delayed-type hypersensitivity reaction
caused by contact allergen) is permitted; use of anabolic steroids is permitted;
topical steroids are permitted as long as they are not directly applied to the area of
the skin where electroporation is planned

- History of anal cancer, penile, vulvar, vaginal, or cervical cancer, or signs of any
of these malignancies at baseline; participants with prior carcinoma in situ will not
be considered to have prior cancer for eligibility purposes

- Current systemic chemotherapy or radiation therapy that potentially causes bone marrow
suppression that would preclude safe treatment of HSIL

- History of preventive HPV vaccination, or intention to receive a preventive HPV
vaccine during study participation (including but not limited to Gardasil or Cervarix)

- History of allergic reactions attributed to compounds of similar chemical or biologic
composition to VGX-3100

- Warts so extensive that they preclude the clinician from determining the extent and
location of HSIL

- Uncontrolled intercurrent illness including, but not limited to, ongoing or active
infection, cardiac arrhythmia, or psychiatric illness/social situations that, in the
opinion of the investigator, would limit compliance with study requirements or could
be negatively affected by the electroporation treatment

- Presence of unstable or life-threatening cardiac disease (e.g. unstable angina, class
3 or higher congestive heart failure)

- Presence of acute or chronic bleeding or clotting disorder that would contraindicate
IM injections or use of blood thinners (e.g. anticoagulants or antiplatelet drugs
except aspirin) within 2 weeks

- Participants who have not recovered from adverse events due to prior anti-HSIL therapy
(i.e., have residual toxicity > grade 1), per Common Toxicity Criteria for Adverse
Events (CTCAE) v4.0

- Participants who have any metal implants, implanted medical devices, tattoos, keloids
or hypertrophic scars, or active lesions/rashes within 2 cm of all intended potential
sites of treatment/electroporation

- History of seizures, except if participants have been seizure-free for 5 years or more
with the use of one or fewer anti-epileptic agents

- Sustained, manually confirmed, sitting systolic blood pressure > 150 mm Hg or < 90 mm
Hg or a diastolic blood pressure > 95 mm Hg at screening or day 0

- Resting heart rate < 50 beats per minute (bpm) (unless attributable to athletic
conditioning) or > 100 bpm at screening or day 0

- Participants who have less than two acceptable sites available for IM injection
considering the deltoid and anterolateral quadriceps muscles

- Participants who have cardioverter-defibrillator or pacemaker (to prevent a
life-threatening arrhythmia) that is located ipsilateral to the deltoid injection site
(unless deemed acceptable by a cardiologist)

- Participants who are breastfeeding a child; investigational product should not be
administered to nursing mothers

- Any illness or condition that in the opinion of the investigator may affect the safety
of the participant or the evaluation of any study endpoint