This is a Phase 1/2 open-label, multicenter trial to evaluate the safety, tolerability, immunogenicity, and efficacy of INO-3107 in participants with human papilloma virus type 6 (HPV-6) and/or type 11 (HPV-11)-associated recurrent respiratory papillomatosis (RRP). The trial population will include participants who have been diagnosed with either Juvenile-Onset RRP (J-O RRP) as defined by age at first diagnosis <12 years or with Adult- Onset RRP (A-O RRP) as defined by age at first diagnosis ≥12 years. A safety run-in will be performed with up to six participants with a one week waiting period between each enrolled participant.

Key Inclusion Criteria:

• Histologically-documented HPV-6- or HPV-11-positive respiratory papilloma or documentation of low-risk positive HPV using a Sponsor approved HPV-6/11 type-specific assay

• Requirement for frequent RRP intervention to remove or resect respiratory papilloma, as defined as at least two RRP surgical (including laser) interventions in the year prior to and including Day 0

• Must be an appropriate candidate for upcoming surgical intervention as per Investigator judgment and RRP Staging Assessment score

• Adequate bone marrow, hepatic, and renal function

• Participants must meet one of the below requirements:

  • Be of non-child bearing potential (≥12 months of non-therapy-induced amenorrhea, confirmed by follicle-stimulating hormone [FSH], if not on hormone replacement)
  • Be surgically sterile (vasectomy in males or absence of ovaries and/or uterus in females)
  • Agree to use one highly effective or combined contraceptive methods that result in a failure rate of <1% per year during the treatment period and at least through week 12 after last dose
  • Agree to abstinence from penile-vaginal intercourse, when this is the participant's preferred and usual lifestyle

Key Exclusion Criteria:

• Recipient of therapy directed towards RRP disease (other than surgery or ablation) including but not limited to anti-virals (including cidofovir), radiation, chemotherapy, anti-angiogenic therapy (including bevacizumab), prophylactic HPV vaccination (including Gardasil) as therapeutic intervention, or therapy with an experimental agent within 3 months prior to Day 0
• Ongoing or recent (within 1 year) evidence of autoimmune disease that required treatment with systemic immunosuppressive treatments, with the exception of: vitiligo, childhood asthma that has resolved, type 1 diabetes, residual hypothyroidism that requires only hormone replacement, or psoriasis that does not require systemic treatment
• Diagnosis of immunodeficiency or treatment with systemic immunosuppressive therapy within 28 days prior to the first dose of trial treatment, including systemic corticosteroids
• High risk of bleeding or require the use of anticoagulants for management of a known bleeding diathesis
• Recipient of any live virus vaccine within 4 weeks prior to the first dose of trial treatment or any non-live vaccine within two weeks prior to the first dose of trial treatment
• History of clinically significant, medically unstable disease which, in the judgment of the Investigator, would jeopardize the safety of the participant, interfere with trial assessment or evaluation, or otherwise impact the validity of the trial results
• Fewer than two acceptable sites are available for IM injection considering the deltoid and anterolateral quadriceps muscles. Study treatment should not be given within 2 centimeters (cm) of a tattoo, keloid or hypertrophic scar. If there is implanted metal, implanted device, within the same limb the use of the deltoid muscle on the same side of the body is excluded
• Prisoners or participants who are compulsory detained (involuntary incarceration) for treatment of either a psychiatric or physical (i.e. infectious disease) illness
• Any medical or psychological or non-medical condition that might interfere with the participation or safety of the participant, as determined by the investigator

Data dictionaries and all collected IPD will be stripped of identifiers and may be made available upon request.

Anonymous IPD may be shared following or during the publication of summary data. Archival data may be accessed for up to 10 years following the end of the study.

Those who request the anonymous IPD must provide a plan of study explaining how the data will be used. Requests may be sent to the Central Contact Person. Requests will be reviewed based on the potential for the planned use of the IPD for advancing scientific knowledge and theory.