Phase Ib of L-NMMA and Pembrolizumab

Inclusion Criteria

• Female or male aged ≥ 18 years on the day of informed consent signing;
• Has histologically confirmed metastatic melanoma that is treatment naïve or has relapsed after or is refractory to ipilimumab or BRAF inhibitor (if BRAF mutation-positive), OR histologically confirmed metastatic NSCLC that has high programmed death-ligand 1 (PD-L1) expression (tumor proportion score [TPS] ≥50%) with no epidermal growth factor receptor (EGFR) or anaplastic lymphoma kinase (ALK) genomic tumor aberrations or histologically confirmed metastatic NSCLC that is PD-L1 positive (TPS ≥1%) and has progressed on or after platinum-containing therapy (subjects with NSCLC harboring EGFR/ALK genomic aberrations must have received an FDA-approved targeted therapy for these aberrations) OR histologically confirmed HNSCC that has relapsed after or is refractory to platinum-containing chemotherapy, OR histologically confirmed cHL that has relapsed after three or more lines of therapy or is refractory to treatment OR histologically confirmed locally advanced or metastatic urothelial carcinoma that is not eligible for platinum-containing chemotherapy or that has relapsed after or is refractory to platinum-containing chemotherapy OR histologically confirmed advanced, PD-L1-positive cervical cancer with disease progression on or after chemotherapy that is not eligible for platinum-containing chemotherapy or that has relapsed after or is refractory to platinum-containing chemotherapy OR histologically confirmed recurrent, locally advanced, or metastatic, squamous cell carcinoma of the esophagus (ESCC) whose tumors express PD-L1 (Combined Positive Score [CPS] ≥10), as determined by an FDA-approved test, with disease progression after one or more prior lines of systemic therapy.

OR histologically confirmed recurrent, locally advanced, or metastatic Gastric Cancer, with disease progression on or after two or more systemic therapies, including fluoropyrimidine- and platinum-containing chemotherapy and, if appropriate, HER2/neu-targeted therapy, and whose tumors express programmed death-ligand 1 (PD-L1), as determined by an FDA-approved test.

OR histologically confirmed hepatocellular carcinoma (HCC) who have been previously treated with sorafenib. recurrent locally advanced or metastatic MCC who had not received prior systemic therapy for their advanced disease OR histologically confirmed recurrent, locally advanced or metastatic Merkel Cell Carcinoma (MCC) who had not received prior systemic therapy for their advanced disease OR histologically confirmed advanced renal cell carcinoma (RCC) first-line treatment.

OR histologically confirmed metastatic small cell lung cancer (SCLC) with disease progression on or after platinum-based chemotherapy and at least one other prior line of therapy.

OR histologically confirmed refractory primary mediastinal large B-cell lymphoma (PMBCL), who have relapsed after two or more prior lines of therapy.

OR MSI-H or dMMR unresectable or metastatic cancer that has relapsed after prior treatment and has no satisfactory alternative treatment options.

OR adult patients with unresectable or metastatic tumor mutational burden-high (TMB-H) [≥10 mutations/megabase (mut/Mb)] solid tumors;

• Measurable disease based on Response Evaluation Criteria in Solid Tumors (RECIST) 1.1;
• Eastern Cooperative Oncology Group performance status of 0-2;
• Life expectancy ≥ 6 months;
• Adequate organ function:

Absolute neutrophil count ≥1,500/mm3, platelets ≥100,000/mm3, hemoglobin ≥9 g/dL (transfusion permitted), serum creatinine OR measured or calculated creatinine clearance ≤1.5 X upper limit of normal (ULN) OR ≥60 mL/min for subject with creatinine levels > 1.5 X institutional ULN, serum total bilirubin ≤ 1.5 X ULN OR direct bilirubin ≤ ULN for subjects with total bilirubin levels > 1.5 ULN, alanine transaminase and aspartate transaminase ≤ 2.5 X ULN OR ≤ 5 X ULN for subjects with liver metastases, albumin >2.5 mg/dL, Internat