PV-10 in Combination With Pembrolizumab for Treatment of Metastatic Melanoma

Inclusion Criteria: 1. Age 18 years or older, male or female. 2. Histologically or cytologically confirmed diagnosis of melanoma. 3. Stage IV or Stage III (unresectable, in-transit or satellite) melanoma. 4. At least 1 Injectable Lesion (i.e., cutaneous, subcutaneous, soft tissue, superficial nodal or palpable nodal lesion with longest diameter at least 5 mm that is suitable for injection with PV-10). 5. A minimum of 1 measurable Target Lesion that can be accurately measured by calipers, computed tomography (CT) or magnetic resonance imaging (MRI) consisting of at least one of the following: * at least one cutaneous lesion (each lesion ≥ 10 mm longest diameteror up to 5 lesions in aggregate having a sum of longest diameters ≥ 10 mm); and/or * at least one subcutaneous or soft tissue lesion (each lesion ≥ 10 mm in longest diameter by CT or MRI); and/or * at least one nodal lesion (each lesion ≥ 15 mm in short axis diameter by CT or MRI); and/or * at least one visceral lesion (each lesion ≥ 10 mm in longest diameter by CT or MRI). 6. Performance Status: Eastern Cooperative Oncology Group (ECOG) 0-1. 7. Clinical Laboratories: * absolute neutrophil count (ANC) ≥ 1.5 x 109/L and platelet count ≥100 x 109/L * estimated creatinine clearance (CrCl, by Cockcroft-Gault formula) or estimated glomerular filtration rate (eGFR) ≥ 30 mL/min/1.73 m2 * total bilirubin ≤ 3 times the upper limit of normal (ULN) * aspartate transaminase (AST), alanine transaminase (ALT) and alkaline phosphatase (ALP) ≤ 5 times the upper limit of normal (ULN) 8. Thyroid function abnormality ≤ Common Toxicity Criteria for Adverse Effects (CTCAE) Grade 2. Exclusion Criteria: 1. Untreated or clinically active melanoma brain metastases. * Subjects with ≤ 3 brain metastases and each ≤ 1 cm size that were treated with either surgical resection and/or radiation therapy are eligible for study participation provided (a) there is no evidence of progressive central nervous system (CNS) disease on brain imaging at least 30 days after definitive treatment and (b) the subject is not taking prednisone at \>10 mg or equivalent daily. * Subjects with \> 1 cm or \> 3 in number treated brain metastases are eligible for study participation provided (a) there is no evidence of progressive CNS disease on brain imaging at least 90 days after treatment with surgery and/or radiation therapy and (b) if the subject is not taking prednisone at \>10 mg or equivalent daily. 2. Prior treatment with PV-10 or any checkpoint inhibitor; however, subjects (a) who have failed to achieve a complete or partial response within 24 weeks following initiation of checkpoint inhibition or (b) who progressed after more than 12 weeks of checkpoint inhibition are eligible for study participation in the Phase 1b Expansion Cohort 1 without washout period for checkpoint inhibition. 3. Other prior cancer therapy or anti-cancer vaccine within the lesser of 4 weeks or 5 half-lives before initial study treatment. 4. Known sensitivity to any of the products or components to be administered during dosing. 5. Concurrent or Intercurrent Illness: * History or evidence of symptomatic autoimmune pneumonitis, glomerulonephritis, vasculitis, or other systemic autoimmune disease. * Evidence of clinically significant immunosuppression. * Impaired wound healing or other extremity complications due to severe or uncontrolled diabetes mellitus in subjects whose Injectable Lesions are located in an extremity. * Severe peripheral vascular disease (i.e., severe claudication \[pain occurring after less than 200 meters of walking\], rest pain, ischemic ulceration or gangrene) in subjects whose Injectable Lesions are located in an extremity. * Significant concurrent or intercurrent illness, psychiatric disorders, or alcohol or chemical dependence that would, in the opinion of the Investigator, compromise the subject's safety or compliance or interfere with interpretation of study results. * Uncontrolled thyroid disease or cystic fibrosis. * Clinically significant acute or unstable cardiovascular, cerebrovascular (stroke), renal, gastrointestinal, pulmonary, immunological, endocrine, or central nervous system disorders. * Malignancy other than melanoma within 2 years of enrollment except for: adequately treated (i.e., with curative intent) basal or squamous cell carcinoma, in situ carcinoma of the cervix, in situ ductal adenocarcinoma of the breast, in situ prostate cancer, or limited stage bladder cancer. 6. Pregnancy: * Female subjects who are pregnant or lactating. * Female subjects who have positive serum pregnancy test taken within 14 days of initiation of study treatment. * Female subjects of childbearing potential (defined as having a menstrual cycle within the past 12 months and not having had a surgical procedure to accomplish sterilization) who are not using highly effective contraception (e.g., oral contraceptives, intrauterine devices, double barrier methods such as condoms and diaphragms, abstinence or equivalent measures). * Male subjects who are unwilling to use acceptable method of effective contraception. 7. Subjects unable to comprehend and give informed consent are excluded.