X4P-001 and Pembrolizumab in Patients With Advanced Melanoma

Inclusion Criteria

• Inclusion Criteria: To be eligible for this study, a patient must meet all of the following inclusion criteria: 1. Be at least 18 years of age. 2. Has signed the current approved informed consent form. 3. Has a histologically confirmed diagnosis of malignant melanoma. 4. Has at least two separate cutaneous lesions suitable for punch biopsies (at least 3 mm diameter). 5. For women of childbearing potential and men, agree to use a highly effective method of contraceptive from screening, through the study, and for at least 4 weeks after the last dose of study drug. 6. For women of childbearing potential, must have a negative pregnancy test (serum or urine) on Day 1 prior to initiating study treatment, and are not nursing. 7. Be willing and able to comply with the schedule, treatment, and biopsies specified by this protocol. Exclusion Criteria: Patients with any of the following will be excluded from participation in the study: 1. Has performance status Grade 2 or higher (Eastern Cooperative Oncology Group [ECOG] criteria). 2. Has ongoing acute clinical adverse events NCI CTCAE Grade 2 or greater resulting from prior cancer therapies (except alopecia). 3. Has had within the past 6 months the occurrence or persistence of one or more of the following medical conditions that could not be controlled with usual medical care (e.g., required emergency care or hospitalization): angina, congestive heart failure, diabetes, seizure disorder. 4. Has had within the past 6 months the occurrence of one or more of the following events: myocardial infarction, cerebrovascular accident, hemorrhage (CTC Grade 3 or 4), chronic liver disease (meeting criteria for Child-Pugh Class B or C), a second active malignancy requiring ongoing treatment during the trial, organ transplantation. 5. Has had within the 4 weeks prior to initiation of study drug, or is expected to have during the study period, surgery requiring general anesthesia 6. Has, at screening, serologic laboratory tests meeting one or more of the following criteria: - An indeterminate or positive test for antibody to human immunodeficiency virus (HIV-1 or -2). - An indeterminate or positive test for antibody to hepatitis C virus (HCV), unless documented to have no detectable viral load on two independent samples. - A positive test for hepatitis B surface antigen (HBsAg). 7. Has, at screening, safety laboratory tests meeting one or more of the following criteria: - Hemoglobin <9.0 g/dL - Absolute neutrophil count (ANC) <1,500/μL - Platelets <100,000/μL - Creatinine >2.0x ULN - Serum aspartate transaminase (AST) >3x ULN - Serum alanine transaminase (ALT) >3x ULN - Total bilirubin >1.5x ULN (unless due to Gilbert's Syndrome) - International normalized ratio (INR) >1.5x ULN (unless on therapeutic anti-coagulation). 8. Has been previously treated with approved or investigational immunotherapy including oncolytic viruses, or agents directed at CTLA-4, PD-1, or PD-L1 ("checkpoint inhibitors"). 9. Has previously received other anti-cancer therapy within 2 weeks prior to Day 1, including radiation therapy or chemotherapy. For investigational anti-cancer therapies, the interval will be determined in consultation with the Medical Monitor. 10. Has, within 2 weeks prior to Day 1, been regularly taking a medication prohibited based on CYP3A4 interaction. 11. Has, at the planned initiation of study drug, an uncontrolled infection. 12. Has any other medical or personal condition that, in the opinion of the Investigator, may potentially compromise the safety or compliance of the patient, or may preclude the patient's successful completion of the clinical trial.